Mulch, A., Teyssier, C., Cosca, M A., and Chamberlain, C.P., 2007, Stable isotope paleoaltimetry of Eocene core complexes in the North American Cordillera, Tectonics, 26 (4), TC4001, doi:10.1029/2006TC00199.
Michael Cosca
Biography
Michael Cosca is a research geologist with the U.S. Geological Survey, who combines 40Ar/39Ar geochronology with mineralogy, petrology, and field geology to understand igneous, metamorphic, and tectonic processes at the regional, local, and sub-grain scale. Mike received his undergraduate degree in geology from the University of California, Berkeley (1981) and M.Sc. (1985) and Ph.D. (1989) in geology from the University of Michigan, Ann Arbor. After completing his Ph.D., he moved to Switzerland and for nearly 19 years conducted scientific research at the University of Lausanne (http://www.unil.ch/gse/home.html). During this time he constructed a 40Ar/39Ar research laboratory and obtained research funding that supported 4 Ph.D. students, 2 M.Sc. students and 2 post-doctoral scholars and worked closely with colleagues from Lausanne. This research was funded primarily with grants he obtained from the Swiss National Science Foundation (http://www.snf.ch/en/Pages/default.aspx) with additional support from the University of Lausanne.
Mike joined the U.S Geological Survey in 2008 and supervises the 40Ar/39Ar geochronology laboratory in Denver. His research is broadly focused on understanding the geochronology of ore deposits, mountain building, volcanic stratigraphy, landscape formation, near-surface faulting, physical and chemical controls of argon distribution in minerals and rocks, and developing novel methods for 40Ar/39Ar analysis. Much of his research involves collaborations with USGS scientists from the Geology, Geophysics, and Geochemistry Science Center and the Geosciences and Environmental Change Science Center. Current research projects include the Cenozoic landscape evolution of the Southern Rocky Mountains, igneous activity related to mineralization in the Basin and Range province, and the timing of fluid flow and mineralization in the Proterozoic mid continent rift of North America.
Publications
Ramalho, R.S., Helffrich, G., Cosca, M., Vance, D., Hoffmann, D., and Schmidt, D.N., 2010, Vertical movements of ocean island volcanoes: insights from a stationary plate environment: Marine Geology, v. 275, p. 84-95.
Buchs, D., Pilet, S., Baumgartner, P., Cosca, M., Flores, K., and Bandini, A., 2013, Low-volume intraplate volcanism in the Early/Middle Jurassic Pacific basin documented by accreted sequences in Costa Rica. Geology, Geophysics, Geosystems (G3), v. 14, p. 1552-1568
Lüdecke, T., Mikes, T., Rojay, F.B., Cosca, M., and Mulch, A., 2013, Stable isotope-based reconstruction of Oligo-Miocene paleoenvironment and paleohydrology of Central Anatolian lake basins (Turkey). Turkish Journal of Earth Sciences, v. 22, p. 793-819.
Farmer, G.L., Glazner, A.F., Kortmeier, W.T., Cosca, M.A., Jones, C.H., Moore, J.E., and Schweickert, R.A., 2013, Mantle lithosphere as a source of postsubduction magmatism, northern Sierra Nevada, California. Geosphere, v. 9, p. 1102-1124.
Idleman, L., Cosca, M.A., Heizler, M.T., Thomson, S.N., Teyssier, C., Whitney, D.L., 2014, Tectonic burial and exhumation cycles tracked by muscovite and K-feldspar40Ar/39Ar thermochronology in a strike-slip fault zone, central Turkey, Tectonophysics, v. 612-613, pp. 134-146.
Science and Products
Date published: May 29, 2020
Status: Active Argon Geochronology
This project supports the USGS argon geochronology laboratory in Denver. The USGS 40Ar/39Ar geochronology laboratory is a state-of-the-art research facility for determining absolute ages of minerals and rocks. The 40Ar/39Ar laboratory contributes critical geochronology to individual USGS research projects and to partners in academia and other Federal...
Date published: April 19, 2019
Data to accompany U.S. Geological Survey Data Series 1099: Petrographic, geochemical and geochronologic data for Cenozoic volcanic rocks of the Tonopah, Divide, and Goldfield Mining Districts, Nevada
This dataset is the assembled analytical results of geochemical, petrographic, and geochronologic data for samples, principally those of unmineralized Tertiary volcanic rocks, from the Tonopah, Divide, and Goldfield mining districts of west-central Nevada. Much of the data presented here for the Tonopah and Divide districts are for samples collected by Bonham and Garside (1979) du
Date published: January 1, 2018
Argon geochronology data from the Austroalpine-Pennine boundary, Central Alps, Switzerland
Ar/Ar data are reported from eight samples of white mica separated from rock samples collected along the Austroalpine-Pennine boundary in the Central Alps of Switzerland. These samples were collected as part of a PhD study to examine the tectonic history of this boundary and these argon geochronology data represent one small part of the study. Data are reported from these eight samples...
Date published: January 1, 2018
U-Pb SHRIMP and 40Ar/39Ar geochronologic data and backscatter electron (BSE) and panchromatic cathodoluminescent (CL) imagery of sample materials for study of dikes, country rock, and alteration systems, Butte, U.S.A.
These data are for a multidisciplinary study of dikes, country rock, and alteration systems, Butte, U.S.A. Results of the study are described and interpreted in Lund and others (2018). Data included are U-Pb sensitive high-resolution ion microprobe (SHRIMP) geochronology for quartz porphyry dikes, 40Ar/39Ar thermochronologic data for biotite, hornblende, and K-feldspar fro
Date published: January 1, 2018
Data release of geospatial map database, argon geochronology and geochemistry data for: Geologic map of the San Antonio Mountain area, northern New Mexico and southern Colorado
This dataset accompanies publication "Geologic map of the San Antonio Mountain area, northern New Mexico and southern Colorado". Data presented here include the digital geologic database, 40Ar/39Ar geochronology and major and trace element chemistry from lava flows and an ignimbrite. The geologic database includes spatial feature classes and non-spatial tables that collectively contain
Attribution: National Cooperative Geologic Mapping Program
Date published: January 1, 2017
Data release for the geologic map of the upper Arkansas River valley region, north-central Colorado
This 1:50,000-scale geologic map represents a compilation of the most recent geologic studies of the upper Arkansas River valley, between Leadville and Salida, Colorado. The valley is structurally controlled by an extensional fault system that forms part of the prominent northern Rio Grande rift, an intra-continental region of crustal extension. This work also incorporates new detailed
Attribution: Geosciences and Environmental Change Science Center
Year Published: 2019
Geologic map of the Poncha Pass area, Chaffee, Fremont, and Saguache Counties, Colorado
This report presents a 1:24,000-scale geologic map, cross sections, and descriptive and interpretative text for the Poncha Pass area in central Colorado. The map area is irregular in shape, covering all of one 7 ½' quadrangle (Poncha Pass) and parts of five others (Mount Ouray, Maysville, Salida West, Salida East, and Wellsville). The map...
Minor, Scott A.; Caine, Jonathan Saul; Ruleman, Chester A.; Fridrich, Christopher J.; Chan, Christine F.; Brandt, Theodore R.; Holm-Denoma, Christopher S.; Morgan, Leah E.; Cosca, Michael A.; Grauch, V. J.Attribution: Geosciences and Environmental Change Science Center, Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Region 7: Upper Colorado Basin
View Citation
Minor, S.A., Caine, J.S., Ruleman, C.A., Fridrich, C.J., Chan, C.F., Brandt, T.R., Holm-Denoma, C.S., Morgan, L.E., Cosca, M.A., and Grauch, V.J.S., 2019, Geologic map of the Poncha Pass area, Chaffee, Fremont, and Saguache Counties, Colorado: U.S. Geological Survey Scientific Investigations Map 3436, 4 sheets, scale 1:24,000, https://doi.org/10.3133/sim3436.
Year Published: 2019
Petrology of volcanic rocks associated with silver-gold (Ag-Au) epithermal deposits in the Tonopah, Divide, and Goldfield Mining Districts, Nevada
Miocene calc-alkaline volcanic rocks, part of the southern segment of the ancestral Cascades magmatic arc, are spatially, temporally, and likely genetically associated with precious metal epithermal deposits in the Tonopah, Divide, and Goldfield Districts of west-central Nevada. In the Tonopah mining district, volcanic rocks include the Mizpah...
du Bray, Edward A.; John, David A.; Colgan, Joseph P.; Vikre, Peter G.; Cosca, Michael A.; Morgan, Leah E.Attribution: Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center, Mineral Resources Program, Region 7: Upper Colorado Basin, United States of America
View Citation
du Bray, E.A., John, D.A., Colgan, J.P., Vikre, P.G., Cosca, M.A., and Morgan, L.E., 2019, Petrology of volcanic rocks associated with silver-gold (Ag-Au) epithermal deposits in the Tonopah, Divide, and Goldfield mining districts, Nevada: U.S. Geological Survey Scientific Investigations Report 2019–5024, 22 p., https://doi.gov/10.3133/sir20195024.
Year Published: 2019
Petrographic, geochemical, and geochronologic data for cenozoic volcanic rocks of the Tonopah, Divide, and Goldfield Mining Districts, Nevada
The purpose of this report is to summarize geochemical, petrographic, and geochronologic data for samples, principally those of unmineralized Tertiary volcanic rocks, from the Tonopah, Divide, and Goldfield mining districts of west-central Nevada (fig. 1). Much of the data presented here for the Tonopah and Divide districts are for samples...
du Bray, Edward A.; John, David A.; Vikre, Peter G.; Colgan, Joseph P.; Cosca, Michael A.; Morgan, Leah E.; Fleck, Robert J.; Premo, Wayne R.; Holm-Denoma, Christopher S.Attribution: Geology, Geophysics, and Geochemistry Science Center, Geosciences and Environmental Change Science Center, Region 7: Upper Colorado Basin, United States of America
View Citation
du Bray, E.A., John, D.A., Vikre, P.G., Colgan, J.P., Cosca, M.A., Morgan, L.E., Fleck, R.J., Premo, W.R., and Holm-Denoma, C.S., 2019, Petrographic, geochemical, and geochronologic data for Cenozoic volcanic rocks of the Tonopah, Divide, and Goldfield mining districts, Nevada: U.S. Geological Survey Data Series 1099, 15 p., https://doi.org/10.3133/ds1099.
Year Published: 2019
A supervolcano and its sidekicks: A 100 ka eruptive chronology of the Fish Canyon Tuff and associated units of the La Garita magmatic system
Establishing temporal constrains on major volcanic eruptions is limited by the precision of existing geochronometers. Prior work on the La Garita caldera, created by the eruption of the Fish Canyon Tuff, failed to resolve temporal differences between pre-, syn-, and post-collapse eruptive units. Here, we report 40Ar/39Ar geochronologic data...
Morgan, Leah E.; Johnstone, Samuel A.; Gilmer, Amy K.; Cosca, Michael A.; Thompson, Ren A.Attribution: Geology, Geophysics, and Geochemistry Science Center, Geosciences and Environmental Change Science Center, Region 7: Upper Colorado Basin
View Citation
Morgan, L. E., Johnstone, S. A., Gilmer, A. K., Cosca, M. A., & Thompson, R. A. (2019). A supervolcano and its sidekicks: A 100 ka eruptive chronology of the Fish Canyon Tuff and associated units of the La Garita magmatic system, Colorado, USA. Geology, 47(5), 453-456.
Year Published: 2019
C–O stable isotope geochemistry and 40Ar/39Ar geochronology of the Bear Lodge carbonatite stockwork, Wyoming, USA
The carbonatite dike swarm and vein stockwork at the center of the Paleogene Bear Lodge alkaline complex (BLAC), Wyoming, USA, is host to diverse REE mineral assemblages that are largely a result of subsolidus modification and REE redistribution. Pseudomorphic replacement of primary burbankite by an assemblage of...
Andersen, Allen; Larson, Peter B.; Cosca, Michael A.
Year Published: 2018
Two-event lode-ore deposition at Butte, USA: 40Ar/39Ar and U-Pb documentation of Ag-Au-polymetallic lodes overprinted by younger stockwork Cu-Mo ores and penecontemporaneous Cu lodes
The ore-genesis model for world-class deposits of the Butte mining district, Montana, USA, is deep pre-Main Stage porphyry Cu-Mo and overlying Main Stage Ag-Zn-Cu zoned-lode deposits, both of which formed from hydrothermal fluids driven by minor volumes of rhyolitic magma. The lode-specific model is that hydrothermal processes diminished in...
Lund, Karen; McAleer, Ryan J.; Aleinikoff, John N.; Cosca, Michael A.; Kunk, Michael J.
Year Published: 2018
Geologic map of the San Antonio Mountain area, northern New Mexico and southern Colorado
The geologic map of the San Antonio Mountain area in northern New Mexico and southern Colorado is located along the west-central part of the San Luis Valley. The San Luis Valley is the geomorphic expression of the San Luis Basin, an extensional basin associated with the northern Rio Grande rift. Deposits within the map area record volcanic,...
Turner, Kenzie J.; Thompson, Ren A.; Cosca, Michael A.; Shroba, Ralph R.; Chan, Christine F.; Morgan, Leah E.Attribution: Geosciences and Environmental Change Science Center, Geology, Geophysics, and Geochemistry Science Center, Region 7: Upper Colorado Basin
View Citation
Turner, K.J., Thompson, R.A., Cosca, M.A., Shroba, R.R., Chan, C.F., and Morgan, L.E., 2018, Geologic map of the San Antonio Mountain area, northern New Mexico and southern Colorado: U.S. Geological Survey Scientific Investigations Map 3417, scale 1:50,000, https://doi.org/10.3133/sim3417.
Year Published: 2018
Rapid late Miocene surface uplift of the Central Anatolian Plateau margin
The Central Anatolian Plateau (CAP), Turkey, is bordered to its south by a steep mountain belt that emerged ∼8–7 Ma ago from the Mediterranean Sea. Knowledge of the onset, duration and rate of surface uplift and orographic barrier formation along the plateau margin is crucial for understanding the geodynamic drivers of plateau uplift. We...
Meijers, Maud J.M.; Brocard, Gilles Y.; Cosca, Michael A.; Lüdecke, Tina; Teyssier, Christian; Whitney, Donna L.; Mulch, Andreas
Year Published: 2018
Climate stability in Central Anatolia during the Messinian Salinity Crisis
Deposition of large amounts of evaporites and erosion of deep canyons within the Mediterranean Basin as a result of reduced basin connectivity with the Atlantic Ocean and the epicontinental Paratethys Sea characterized the Messinian Salinity Crisis (MSC, 5.97–5.33 Ma). The influence of the MSC on Mediterranean environmental conditions...
Meijers, Maud J.M.; Peynircioğlu, Ahmet A; Cosca, Michael A.; Brocard, Gilles Y.; Whitney, Donna L.; Langereis, Cor G.; Mulch, Andreas
Year Published: 2018
Thermochronometry across the Austroalpine-Pennine boundary, Central Alps, Switzerland: Orogen-perpendicular normal fault slip on a major ‘overthrust’ and its implications for orogenesis
Fifty‐one new and 309 published thermochronometric ages (nine systems with closure temperatures ranging from ~450 to 70°C) from the Graubünden region of the Central Alps demonstrate that a pronounced thermal mismatch between the Austroalpine allochthon (Alpine “orogenic lid”) and the Pennine zone persisted until at least 29 Ma and, allowably...
Price, Jason B.; Wernicke, Brian P.; Cosca, Michael A.; Farley, Kenneth A.
Year Published: 2017
Geologic map of the upper Arkansas River valley region, north-central Colorado
This 1:50,000-scale U.S. Geological Survey geologic map represents a compilation of the most recent geologic studies of the upper Arkansas River valley between Leadville and Salida, Colorado. The valley is structurally controlled by an extensional fault system that forms part of the prominent northern Rio Grande rift, an intra-continental region...
Kellogg, Karl S.; Shroba, Ralph R.; Ruleman, Chester A.; Bohannon, Robert G.; McIntosh, William C.; Premo, Wayne R.; Cosca, Michael A.; Moscati, Richard J.; Brandt, Theodore R.Attribution: Geosciences and Environmental Change Science Center, Groundwater and Streamflow Information Program, Region 7: Upper Colorado Basin
View Citation
Kellogg, K.S., Shroba, R.R., Ruleman, C.A., Bohannon, R.G., McIntosh, W. C., Premo, W.R., Cosca, M.A., Moscati, R.J., and Brandt, T.R., 2017, Geologic map of the upper Arkansas River valley region, north-central Colorado: U.S. Geological Survey Scientific Investigations Map 3382, pamphlet 70 p., 2 sheets, scale 1:50,000, https://doi.org/10.3133/sim3382.
Year Published: 2017
Emergence and evolution of Santa Maria Island (Azores)—The conundrum of uplifted islands revisited
The growth and decay of ocean-island volcanoes are intrinsically linked to vertical movements. While the causes for subsidence are better understood, uplift mechanisms remain enigmatic. Santa Maria Island in the Azores Archipelago is an ocean-island volcano resting on top of young lithosphere, barely 480 km away from the Mid-Atlantic Ridge. Like...
Ramalho, Ricardo; Helffrich, George; Madeira, Jose; Cosca, Michael A.; Thomas, Christine; Quartau, Rui; Hipolito, Ana; Rovere, Alessio; Hearty, Paul; Avila, SergioView Citation
Ricardo S. Ramalho, George Helffrich, José Madeira, Michael Cosca, Christine Thomas, Rui Quartau, Ana Hipólito, Alessio Rovere, Paul J. Hearty, and Sérgio P. Ávila
Emergence and evolution of Santa Maria Island (Azores)—The conundrum of uplifted islands revisited
Geological Society of America Bulletin, B31538.1, first published on October 21, 2016
Pre-USGS Publications
Zechmeister, M.S., Ferre, E., Cosca, M.A., Geissman, J.W., 2007, Slow and fast deformation in the Dora Maira Massif, Italian Alps: Pseudotachylytes and inferences on exhumation history. Journal of Stuctural Geology, 29 (7), p. 1114-1130, doi:10.1016/j.jsg.2007.03.009.
Limiting Effects of UHP Metamorphism on Length Scales of Oxygen, Hydrogen, and Argon Isotope Exchange: An Example from the Qinglongshan UHP Eclogites, Sulu Terrain, China
Cosca, M. A., Giorgis, D., Rumble, D., and Liou, J. G. 2006, Limiting effects of UHP metamorphism on length scales of oxygen, hydrogen, and argon isotope exchange: an example from the Qinglongshan UHP ecologites, Sulu Terrain, China: In: Phase relations, high-pressure terranes, P-T-ometry, and plate pushing: a tribute to W. G. Ernst. International Book Series, v. 9, p. 290-323.
Keane, S.D., DeWolf, C.P., Essene, E.J., Halliday, A.N., Hall, C.M., Cosca, M.A., 2006, Isotopic Constraints on the Thermal History of the Wind River Range, Wyoming: Implications for Archean Metamorphism. Canadian Journal of Earth Science, 43 (10), 1511-1532, doi:10.1139/e06-090.
Manatschal, G., Engström, A., Desmurs, L., Schaltegger, U., Cosca, M., Müntener, O., Bernoulli, D., 2006, What is the tectono-metamorphic evolution of continental break-up: the example of the Tasna ocean-continent transistion. Journal of Structural Geology,28 (10), 1849-1869, doi:10.1016/j.jsg.2006.07.014.
Mulch, A., Teyssier, C, Cosca, M.A, and Vennemann, T.W., 2006, Thermomechanical analysis of strain localization in a ductile detachment zone. Journal of Geophysical Research Solid Earth, 111 (B12), doi:10.1029/2005JB004032.
Cosca, M.A., Caby, R., and Bussy, F., 2005, Geochemistry and 40Ar/39Ar geochronology of pseudotachylyte associated with UHP whiteschists from the Dora Maira massif, Italy. Tectonophysics, 402 (1-4), 93-110, doi:10.1016/j.tecto.2004.12.033.
Cosca, M.A., Giorgis, D., Rumble, D., Liou, J.G., 2005, Limiting effects of UHP metamorphism on length-scales of oxygen, hydrogen, and argon isotope exchange: an example from the Qinglongshan UHP eclogites. International Geology Review, 47 (7), 716-749, doi:10.2747/0020-6814.47.7.716.
Mulch, A., Cosca, M.A., Fiebig, J., and Andresen, A., 2005, Time scales of deformation and exhumation in extensional detachment systems determined by high-spatial resolution in situ UV-laser 40Ar/39Ar dating. Earth and Planetary Science Letters, 233 (3-4), 375-390, doi:10.1016/j.epsl.2005.01.042.
Putlitz, B., Cosca, M.A., and Schumacher, J., 2005, Prograde mica 40Ar/39Ar growth ages recorded in high pressure rocks (Syros, Cyclades, Greece). Chemical Geology, 214 (1-2), 79-98, doi:10.1016/j.chemgeo.2004.08.056.
Haeberlin, Y., Moritz, R., Fontboté, L., and Cosca, M., 2004, Carboniferous orogenic gold deposits at Pataz, Eastern Andean Cordillera, Peru: Geological and structural framework, paragenesis, alteration, and 40Ar/39Ar geochronology. Economic Geology, 99 (1), 73-112, doi:10.2113/gsecongeo.99.1.73.
Mulch, A. and Cosca, M.A., 2004, Recrystallization or cooling ages? In situ UV-laser 40Ar/39Ar geochronology of muscovite in mylonitic rocks. Journal of the Geological Society of London, 161 (4), 573-582, doi:10.1144/0016-764903-110.
Mulch, A., Teyssier, C., Cosca, M.A., Vanderhaeghe, O., and Vennemann, T., 2004, Reconstructing paleoelevation in eroded orogens. Geology, 32 (6), 525-528, doi:10.1130/G20394.1.
Vannay, J-C., Grasemann, B., Rahn, M., Frank, W., Carter, A., Baudraz, V., Cosca, M., 2004, Miocene to Holocene exhumation of metamorphic crustal wedges in the NW Himalaya: evidence for tectonic extrusion coupled to fluvial erosion. Tectonics, 23 (1), doi:10.1029/2002TC001429.
Winer, G.S., Feeley, T.C., and Cosca, M.A., 2004, Basaltic volcanism in the Bering Sea: geochronology and volcanic evolution of St. Paul Island, Pribilof Islands, Alaska. Journal of Volcanology and Geothermal Research, 134 (4), 277-301, doi:10.1016/j.jvolgeores.2004.02.003.
Bendezú, R., Fontbonté, L., Cosca, M., 2003, Relative age of Cordilleran base metal lode and replacement deposits, and high sulfidation Au-(Ag) epithermal mineralization in the Colquijirca district, central Peru. Mineralium Deposita, 38, 683-694, doi:10.1007/s00126-003-0358-z.
Camprubí, A., Ferrari, L., Cosca, M.A., Cardellach, E., Canals, A., 2003, Ages of epithermal deposits in Mexico: regional significance and links with the evolution of Tertiary volcanism. Economic Geology, 98 (5), 1029-1037, doi:10.2113/gsecongeo.98.5.1029.
Feeley, T.C., and Cosca, M.A., 2003, Time vs. composition trends of magmatism at Sunlight volcano, Absaroka Volcanic Province, Wyoming. Geological Society of America Bulletin, 115 (6), 714-728, doi:10.1130/0016-7606(2003)115<C0714:TVCTOM>2.0.CO;2.
Giorgis, D., Cosca, M.A., Rumble, D., 2003, Pre-metamorphic d18O signatures in morphologically complex zircons from the Qinglongshan UHP meta-granite (Sulu terrain, China). Swiss Bulletin of Mineralogy and Petrology, 83 (2), 133-144, https://www.ingentaconnect.com/content/ssmp/sbmp/2003/00000083/00000002/art00002.
Jourdan, F., Marzoli, A., Bertrand, H., Cosca, M., Fontignie, D., 2003, The Northernmost CAMP: 40Ar/39Ar age, petrology and Sr-Nd-Pb isotope geochemistry of the Kerforne dike, Brittany, France. In: Hames, W.C et al. (eds.) The Central Atlantic Magmatic Province: Fragments of Pangea, AGU Geophysical Monograph, 136, 209-226, doi:10.1029/136GM11.
Kirschner, D.L., Cosca, M.A., and Masson, H., 2003, An 40Ar/39Ar, Rb/Sr, and stable isotope study of micas in low-grade fold-and-thrust belt: An example from the Swiss Helvetic Alps. Contributions to Mineralogy and Petrology, 145 (4), 460-480, doi:10.1007/s00410-003-0461-2.
Kramar, N., Cosca, M.A., Buffat, P.A., and Baumgartner, L.P., 2003, Stacking fault-enhanced argon diffusion in naturally deformed muscovite. In Vance, D., Muller, W., and Villa, I., eds., Geochronology: Linking the Isotopic Record with Petrology and Textures, Geological Society of London. Special Publication, 220, 249-260, doi:10.1144/GSL.SP.2003.220.01.15.
Rodríguez Aller, J., Cosca, M. A., Gil Ibarguchi, J. I., and Dallmeyer, R. D., 2003, Strain partitioning and preservation of 40Ar/39Ar ages for the eclogite-facies stage during Variscan exhumation of a subducted crust (Malpica-Tui allochthon, NW Spain) Lithos, 70 (3-4), 111-139, doi:10.1016/S0024-4937(03)00095-1.
Schlup, M., Carter, A., Cosca, M., and Steck, A., 2003, Exhumation history of eastern Ladakh revealed by 40Ar/39Ar and fission-track ages: the Indus River-Tso Morari transect, NW Himalaya. Journal of the Geological Society of London, 160, 385-369, doi:10.1144/0016-764902-084.
Feeley, T.C., Cosca, M.A., and Lindsay, C.R., 2002, Petrogenesis and implications of calc-alkaline cryptic hybrid magmas from Washburn volcano, Absaroka Volcanic Province, USA. Journal of Petrology, 43 (4), 663-703, doi:10.1093/petrology/43.4.663.
Markley, M., Teyssier, C., and Cosca, M., 2002, The relation between grain size and 40Ar/39Ar date for Alpine white mica from the Siviez-Mischabel Nappe, Switzerland. Journal of Stuctural Geology, 24 (12), 1937-1955, doi:10.1016/S0191-8141(02)00006-8.
Mulch, A., Cosca, M.A., and Handy, M.R., 2002, In situ UV-laser 40Ar/39Ar geochronology of a micaceous mylonite: an example of defect-enhanced argon loss. Contributions to Mineralogy and Petrology, 142, 738-752, doi:10.1007/s00410-001-0325-6.
Solé, J., Cosca, M., Sharp, Z., and Enrique, P, 2002, 40Ar/39Ar geochronolgy and stable isotope geochemistry of late-Hercynian intrusions from north-eastern Iberia with implications for argon loss in K-feldspar. International Journal of Earth Science, 91, 865-881, doi:10.1007/s00531-001-0251-x.
Crowe, W.A., Cosca, M.A., Harris, L.B., 2001, 40Ar/39Ar geochronology and Neoproterozoic tectonics along the northern margin of the Eastern Ghats Belt in north Orissa, India. Precambrian Research, 108 (3-4), 237-266, doi:10.1016/S0301-9268(01)00132-2.
Calcareous plankton biostratigraphy and 40Ar/39Ar dating of Miocene volcanoclastic layers from Monferrato (NW Italy)
D’Atri, A., Dela Pierre, Ruffini, R., Novaretti, A., Cosca, M., Hunziker, J.C., 2001, Calcareous plankton biostratigraphy and 40Ar/39Ar dating of Miocene volcanoclastic layers from Monferrato (NW Italy). Eclogae Geologicae Helvetiae, 94 (2), 137-144.
de Sigoyer, J., Chavagnac, V., Blichert-Toft, J., Villa, I., Luais, B., Guillot, S., Cosca, M., and Mascle, G., 2001, Dating the Indian continental subduction and collisional thickening in the northwest Himalaya: Multichronology of the Tso Morari eclogites. Comment and Reply, Geology, 29 (2), 192-193, doi:10.1130/0091-7613(2001)029<0192:R>2.0.CO;2.
Edel, J-B., Dubois, D., Marchant, R., Hernandez, J., and Cosca, M., 2001, La rotation miocène inférieur du bloc corso-sarde. Nouvelles contraintes paléomagnetiques sur la fin du mouvement. Bulletin Societé Géologique de France, 172 (3), 275-283, doi:10.2113/172.3.275.
Janák, M., Plašienka, D., Frey, M., Cosca, M., Schmidt, S., Lupták, B., and Meres, S., 2001, Cretaceous evolution of a metamorphic core complex, the Verporic unit, Western Carpathians (Slovakia): P-T conditions and in situ 40Ar/39Ar UV laser probe dating of metapelites. Journal of Metamorphic Geology, 19 (2), 197-216, doi:10.1046/j.0263-4929.2000.00304.x.
Kramar, N., Cosca, M.A., Hunziker, J.C., 2001, Heterogenous 40Ar* distributions in naturally deformed muscovite: in situ UV-laser ablation evidence for microstructurally controlled intragrain diffusion. Earth and Planetary Science Letters, 192 (3), 377-388, doi:10.1016/S0012-821X(01)00456-3.
Odin, G.S., Takahashi, M., and Cosca M.A., 2001, 40Ar/39Ar geochronology of Middle Miocene calcareous nannofossil biohorizhons in central Japan. Chemical Geology, 171 (3-4), 239-252, doi:10.1016/S0009-2541(00)00250-3.
de Sigoyer, J., Chavagnac, V., Blichert-Toft, J., Villa, I., Luais, B., Guillot, S., Cosca, M., and Mascle, G., 2000, Dating the Indian continental subduction and collisional thickening in the northwest Himalaya: Multichronology of the Tso Morari eclogites. Geology, 28 (6), 487-490, doi:10.1130/0091-7613(2000)28<487:DTICSA>2.0.CO;2.
Giorgis, D., Cosca, M.A., Li, S., 2000, Distribution and significance of extraneous argon in UHP eclogite (Sulu terrane, China): insights from in-situ 40Ar/39Ar UV-laser ablation analysis. Earth and Planetary Science Letters, 181 (4), 605-615, doi:10.1016/S0012-821X(00)00221-1.
Zeh, A., Cosca, M., Brätz, H., Okrusch, M., and Tichomirova, M., 2000, Simultaneous horst-basin formation and magmatism during Late Variscan transtension: evidence from40Ar/39Ar and 207Pb/206Pb geochronology of the Ruhla Crystalline Complex, International Journal of Earth Science, 89 (1), 52-71, doi:10.1007/s005310050317.
Cosca, M.A., Shimron, A., and Caby, R., 1999, Late Precambrian metamorphism and cooling in the Arabian-Nubian Shield: petrology and 40Ar/39Ar geochronology of metamorphic rocks of the Elat area (southern Israel). Precambrian Research, 98 (1-2), 107-127, doi:10.1016/S0301-9268(99)00044-3.
Dèzes, P.J., Vannay, J.-C., Steck, A., Bussy, F., and Cosca, M., 1999, Synorogenic extension: quantitative constraints on the age and throw of the Zanskar Shear Zone (NW Himalaya). Geological Society of America Bulletin, 111 (3), 364-374, doi:10.1130/0016-7606(1999)111<0364:SEQCOT>2.3.CO;2.
Guillot, S., Cosca, M.A., Allemand, P., and Le Fort, P., 1999, Contrasting metamorphic and geochronologic evolution along the Himalayan Belt. In: Macfarlane, A., Sorkhabi, R.B., Quade, J. (eds) Himalaya and Tibet: Mountain Roots to Mountain Tops. Geological Society of America Special Paper, 328, 117-128, doi:10.1130/0-8137-2328-0.117.
The Pataz gold province (Peru) within the frame of a mesothermal gold and antimony belt of the Eastern Andean Cordillera
Haeberlin, Y., Moritz, R., Fontboté, L., and Cosca, M., 1999, The Pataz gold province (Peru) within the frame of a mesothermal gold and antimony belt of the Eastern Andean Cordillera. In: Stanley, C.J., et al. (eds.) Mineral deposits: processes to processing. Balkema, 2, 1323-326.
Jaboyedoff, M., and Cosca, M.A., 1999, Dating incipient metamorphism using 40Ar/39Ar geochronolgy and XRD modeling: a case study from the Swiss Alps. Contributions to Mineralogy and Petrology, 135, 93-113, doi:10.1007/s004100050500.
Mezger, K., and Cosca, M.A., 1999, The thermal history of the Eastern Ghats (India) as revealed by U-Pb and 40Ar/39Ar dating of metamorphic and magmatic minerals: implications for the SWEAT correlation. Precambrian Research 94 (3-4), 251-271, doi:10.1016/S0301-9268(98)00118-1.
Inception and early evolution of the Izu-Bonin-Mariana arc system: evidence from 40Ar/39Ar and K-Ar geochronology
Cosca, M.A., Arculus, R.J., Pearce, J.A., and Mitchell, J.G., 1998, Inception and early evolution of the Izu-Bonin-Mariana arc system: evidence from 40Ar/39Ar and K-Ar geochronology. The Island Arc, v. 7, p. 579-595.
Cosca, M.A., Mezger, K., and Essene, E.J., 1998, The Baltica-Laurentia connection: Sveconorwegian (Grenvillian) metamorphism, cooling, and unroofing in the Bamble Sector, Norway. Journal of Geology, 106 (5), 539-552, doi:10.1086/516040.
Markley, M.J., Teyssier, C., Cosca, M.A., Caby, R., Hunziker, J.C. and Sartori, M., 1998, Alpine deformation and 40Ar/39Ar geochronology of synkinematic white mica in the Siviez-Mischabel Nappe, western Pennine Alps, Switzerland. Tectonics, v. 17, p. 407-425.
A 40Ar/39Ar dating study of very low-grade metamorphism from the Rybachi and Sredni Peninsulas, NW Russia-a preliminary report
Roberts, D., Cosca, M.A., and Rice, A.H.N., 1998, A 40Ar/39Ar dating study of very low-grade metamorphism from the Rybachi and Sredni Peninsulas, NW Russia-a preliminary report. Norwegian Geological Survey Report, 168, 1-17.
High-precision U-Pb and 40Ar/39Ar dating of an Alpine ophiolite (Gets nappe, French Alps)
Bill, M., Bussy, F., Cosca, M., Masson, H., and Hunziker, J.C., 1997, High-precision U-Pb and 40Ar/39Ar dating of an Alpine ophiolite (Gets nappe, French Alps). Eclogae Geologicae Helvetiae, 90, 43-54.
40Ar/39Ar ages of Clarence River Supersuite intrusions from the northern portion of the New England Batholith, southern New England Orogen
Bryant, C.J., Cosca, M.A., and Arculus, R.J., 1997, 40Ar/39Ar ages of Clarence River Supersuite intrusions from the northern portion of the New England Batholith, southern New England Orogen. In Ashley, P.M. and Flood, P.G., eds., Tectonics and Metallogenesis of the New England Orogen, Geological Society of Australia Special Publication, 19, 242-253.
Metagranitoids and associated metasediments as indicators for the pre-Alpine magmatic and metamorphic evolution of the western Austroalpine Oetztal Basement (Kaunertal, Tirol)
Hoinkes, G., Thöni, M., Lichem, C., Bernhard, F., Kaindl, R., Schweigel, J., Tropper P., and Cosca, M., 1997, Metagranitoids and associated metasediments as indicators for the pre-Alpine magmatic and metamorphic evolution of the western Austroalpine Oetztal Basement (Kaunertal, Tirol). Swiss Bulletin of Mineralogy and Petrology, 77, 299-314.
Moecher, D.M., Cosca, M.A., and Hanson, G.N., 1997, Petrologic and 40Ar/39Ar geochronological constraints on the middle to late Paleozoic thermotectonic history of the southern Connecticut Valley zone, New England Appalachians. Geological Society of America Bulletin, 109 (2), 164-175, doi:10.1130/0016-7606(1997)109<0164:PAAAGC>2.3.CO;2.
Odin, G.S., Amorosi, A., Tateo, F., Coccioni, R., Cosca, M., Negri, A., Pini, G.A., and Hunziker, J.C., 1997, Chapter C2 Integrated stratigraphy (biostratigraphy and geochronology) of the Early Miocene sequence from the Emilian Apennines (Italy). In Montanari, A., Coccioni, R., and Odin, G. S. (eds.) Miocene Integrated Stratigraphic Sequence, p. 221-248. Elsevier, Amsterdam, doi:10.1016/S0920-5446(06)80020-8.
Odin, G.S., Cosca, M., Tateo, F., Negri, A., Vai, G. B., and Hunziker, J.C., 1997, Chapter E2 Integrated stratigraphy of the Late Tortonian Peive di Gesso section (Romagna, Italy). In Montanari, A., Coccioni, R., and Odin, G. S. (eds.) Miocene Integrated Stratigraphic Sequence, p. 449-460. Elsevier, Amsterdam.
Odin, G.S., Cuenca Bescós, G., Canuda, J.J., Cosca, M., and Lago, M., 1997, Chapter C5 Biostratigraphy and geochronology of a Miocene continental volcanoclastic layer from the Ebro basin, Spain. In Montanari, A., Coccioni, R., and Odin, G. S. (eds.) Miocene Integrated Stratigraphic Sequence, p. 297-310. Elsevier, Amsterdam.
Odin, G.S., d’Atri, A., Tateo, F., Cosca, M., and Hunziker, J.C., 1997, Chapter C1 Integrated stratigraphy near the Oligocene-Miocene boundary in the Piedmont basin (Italy): biostratigraphy and geochronology. In Montanari, A., Coccioni, R., and Odin, G. S. (eds.) Miocene Integrated Stratigraphic Sequence, p. 209-220. Elsevier, Amsterdam, doi:10.1016/S0920-5446(06)80019-1.
Odin, G.S., Deino, A., Cosca, M., Laurenzi, M.A., and Montanari, A., 1997, Chapter F1 Miocene geochronology: methods, techniques, and results. In Montanari, A., Coccioni, R., and Odin, G. S. (eds.) Miocene Integrated Stratigraphic Sequence, p. 581-594. Elsevier, Amsterdam.
Odin, G.S., Miculan, P., Cosca, M., Tateo, F., Amorosi, A., and Hunziker, J.C., 1997, Chapter D3Biostratigraphy and geochronology of an Early Serravallian volcanoclastic layer from Sicily. In Montanari, A., Coccioni, R., and Odin, G. S. (eds.) Miocene Integrated Stratigraphic Sequence, p. 351-360. Elsevier, Amsterdam.
Odin, G.S., Ricci Lucchi, F., Tateo, F., Cosca, M., and Hunziker, J.C., 1997, Chapter E7 Integrated stratigraphy of the Maccarone section, Late Messinian (Marche region, Italy). In Montanari, A., Coccioni, R., and Odin, G. S. (eds.) Miocene Integrated Stratigraphic Sequence, p. 529-544. Elsevier, Amsterdam.
Odin, G.S., Takahashi, M., Coccioni, R., and Cosca, M., 1997, Chapter D7 Géochronologie de niveaux situés autour de l’apparition de Globigerina nepenthes au Japon et in Italie: âge de la limite Serravallien/Tortonien. In Montanari, A., Coccioni, R., and Odin, G. S. (eds.) Miocene Integrated Stratigraphic Sequence, p. 393-400. Elsevier, Amsterdam.
Odin, G.S., Vai, G.B., Cosca, M., Tateo, F., and Hunziker, J.C., 1997, Chapter E6 Contribution to the geochronology of the Tortonian/Messinian bundary in the Faenza (Romagna, Italy). In Montanari, A., Coccioni, R., and Odin, G. S. (eds.) Miocene Integrated Stratigraphic Sequence, p. 519-528. Elsevier, Amsterdam, doi:10.1016/S0920-5446(06)80038-5.
Restrepo-Pace, P.A., Ruiz, J., Gehrels, G., and Cosca, M., 1997, Geochronology and Nd isotopic data of Grenville-age rocks in the Colombian Andes: new constraints for Late Proterozoic-Early Paleozoic paleocontinental reconstructions of the Americas. Earth and Planetary Science Letters, 150 (3-4), 427-441, doi:10.1016/S0012-821X(97)00091-5.
Kirschner, D.L., Cosca, M.A., Hunziker, J.C., and Masson, H., 1996, Staircase 40Ar/39Ar spectra of fine-grained white mica: timing and duration of deformation and empirical constraints on argon diffusion. Geology, v. 24, p. 747-750.
Schärer, U., Cosca, M., Hunziker, J., and Steck, A., 1996, Termination of major ductile strike-slip shear and differential cooling along the Insubric line (Central Alps): U/Pb, Rb/Sr and 40Ar/39Ar ages of cross-cutting pegmatites. Earth and Planetary Science Letters, v. 142, p. 331-352.
Cosca, M.A., Essene, E.J., Mezger, K., and van der Pluijm, B.A., 1995, Constraints on the duration of tectonic processes: protracted extension and deep crustal rotation in the Grenville Orogen. Geology, 23 (4), 361-364, doi:10.1130/0091-7613(1995)023<0361:COTDOT>2.3.CO;2.
Crespo-Blanc, A., Masson, H., Sharp, Z., Cosca, M., and Hunziker, J., 1995, A stable and 40Ar/39Ar isotope study of a major thrust in the Helvetic nappes (Swiss Alps): evidence for fluid flow and constraints on nappe kinematics. Geological Society of America Bulletin, 107 (10), 1129-1144, doi:10.1130/0016-7606(1995)107<1129:ASAAAI>2.3.CO;2.
Odin, G.S., Coccioni, R., Cosca, M., and Montanari, A., 1995, 40Ar/39Ar geochronology of biostratigraphically controlled Miocene tuffs from central Japan: Comparison with Italy and age of the Serravallian-Tortonian boundary. Chemical Geology, 125 (1-2), 105-121, doi:10.1016/0009-2541(95)00075-W.
The volcanic supply of the Taveyanne turbidites (Savoie, France): a riddle for Tertiary Alpine volcanism
Ruffini, R., Cosca, M.A., d’Atri, A., Hunziker, J.C., and Polino, R., 1995, The volcanic supply of the Taveyanne turbidites (Savoie, France): a riddle for Tertiary Alpine volcanism. In: Polino, R. And Sacchi, R. (eds.) Rapporti Alpi-Appennino e Guide Alle Escursioni, Accademia Nazionale Delle Scienze Detta Dei XL, Roma, p. 359-376.
Schmädicke, E., Mezger, K., Cosca, M.A., and Okrusch, M., 1995, Variscan Sm/Nd and Ar/Ar ages of eclogite-facies rocks from the Erzgebirge, Bohemian Massif. Journal of Metamorphic Geology, 13 (5), 537 - 552, doi:10.1111/j.1525-1314.1995.tb00241.x.
Cosca, M.A. and O'Nions R.K., 1994, A re-examination of the influence of composition on argon retentivity in metamorphic calcic amphiboles. Chemical Geology, 112 (1-2), 39-56, doi:10.1016/0009-2541(94)90103-1.
40Ar/39Ar geochronology of a Burdigalian tuff from central-northern Sardinia
Odin, G.S., Assorgia, A., Barca, S., Porcu, A., Spano, J., and Cosca, M., 1994, 40Ar/39Ar geochronology of a Burdigalian tuff from central-northern Sardinia. Giornale Geologia, v. 56, p. 185-197.
Premiers âge géochronologiques de niveaux volcaniclastiques oligocènes de la Région de Zasavje, Slovénie
Odin, G.S., Jelen, B., Drobne, K., Uhan, J., Skaberne, D., PavŠic, J., Cimerman, F.. Cosca, M., and Hunziker, J.C., 1994, Premiers âge géochronologiques de niveaux volcaniclastiques oligocènes de la Région de Zasavje, Slovénie. Giornale Geologia, v. 56, p. 199-212.
van der Pluijm, B.A., Mezger, K., Cosca, M.A., and Essene, E.J., 1994, Determining the significance of high-grade shear zones by using temperature-time paths, with examples from the Grenville Orogen. Geology, 22 (8), 743-746, doi:10.1130/0091-7613(1994)022<0743:DTSOHG>2.3.CO;2.
Spring, L., Bussy, F., Vannay, J.C., Huon, S., and Cosca, M.A., 1993, Early Permian granitic dykes of alkaline affinity in the Indian High Himalaya of Upper Lahul and SE Zanskar: geochemical characterization and geotectonic implications. Geological Society, London, Special Publications, 74, 251-264, doi:10.1144/GSL.SP.1993.074.01.18.
Cosca, M.A., Essene, E.J., Kunk, M.J., and Sutter, J.F., 1992, Differential unroofing within the Central Metasedimentary Belt of the Grenville Orogen: constraints from 40Ar/39Ar thermochronology. Contributions to Mineralogy and Petrology, 110, 211-225, doi:10.1007/BF00310739.
Cosca, M.A., Hunziker, J.C., Huon, S., and Masson, H., 1992, Radiometric age constraints on mineral growth, metamorphism, and tectonism of the Gummfluh Klippe, Briançonnais domain of the Préalpes, Switzerland. Contributions to Mineralogy and Petrology, 112, 439-449, doi:10.1007/BF00310776.
Cosca, M.A., Essene, E.J., and Bowman, J.R., 1991, Complete chemical analyses of metamorphic hornblendes: implications for normalizations, calculated H2O activities and thermobarometry. Contributions to Mineralogy and Petrology, 108, 472-484, doi:10.1007/BF00303451.
Cosca, M.A., Sutter, J.F., and Essene, E.J., 1991, Cooling and inferred uplift/erosion history of the Grenville Orogen, Ontario: constraints from 40Ar/39Ar thermochronology. Tectonics, 10 (5), 959-977, doi:10.1029/91TC00859.
Cosca, M.A., Sutter, J.F., and Essene, E.J., 1990, Comment on "Interpretation of K/Ar mineral dates from the Grenville Orogenic Belt." American Journal of Science, 290 (2), 202-204, doi:10.2475/ajs.290.2.202.
Cooling and inferred uplift history of the Grenville Orogen, Ontaria: constraints from 40Ar/39Ar thermochronology
Cosca, M.A., 1989, Cooling and inferred uplift history of the Grenville Orogen, Ontaria: constraints from 40Ar/39Ar thermochronology: PhD thesis University of Michigan, 235 pp.
Cosca, M.A., Essene, E.J., Geissman, J.G., Simmons, W.B., and Coates, D.A., 1989, Pyrometamorphic rocks associated with naturally burned coal beds, Powder River Basin, Wyoming. American Mineralogist, 74 (1-2), 85-100, https://pubs.geoscienceworld.org/ammin/article/74/1-2/85/42195/Pyrometamorphic-rocks-associated-with-naturally.
Cosca, M.A., Rouse, R.C., and Essene, E.J., 1988, Dorrite (Ca2(Mg2 Fe3+4)(Al4Si2)O20), a new member of the aenigmatite group from a pyrometamorphic melt-rock. American Mineralogist, 73 (11-12), 1440-1449, https://pubs.geoscienceworld.org/ammin/article/73/11-12/1440/42089/Dorite-Ca-2-Mg-2-Fe-super-3-4-Al-4-Si-2-O-20-a-new.
Cosca, M.A., and Peacor, D.R., 1987, Chemistry and structure of esseneite (CaFe3+AlSiO6), a new pyroxene produced by pyrometamorphism: American Mineralogist, 72 (1-2), 148-156, https://pubs.geoscienceworld.org/ammin/article/72/1-2/148/41909/Chemistry-and-structure-of-esseneite-CaFe-super-3.
Yau, Y.C., Peacor, D.R., Essene, E.J., Lee, J.H., Kuo, L.C., and Cosca, M.A., 1987, Hydrothermal experiments on candidate packing materials. Clays and Clay Mineralalogy, 35 (4), 241-250, https://pubs.geoscienceworld.org/ccm/article/35/4/241/47021/Hydrothermal-treatment-of-smectite-illite-and.