Florence Bascom Geoscience Center

Publications

Filter Total Items: 533
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Year Published: 2017

Central Arctic Ocean paleoceanography from  ∼50 ka to present, on the basis of ostracode faunal assemblages from the SWERUS 2014 expedition

Late Quaternary paleoceanographic changes at the Lomonosov Ridge, central Arctic Ocean, were reconstructed from a multicore and gravity core recovered during the 2014 SWERUS-C3 Expedition. Ostracode assemblages dated by accelerator mass spectrometry (AMS) indicate changing sea-ice conditions and warm Atlantic Water (AW)inflow to the Arctic Ocean...

Gemery, Laura; Cronin, Thomas M.; Poirier, Robert K.; Pearce, Christof; Barrientos, Natalia; O'Regan, Matt; Johansson, Carina; Koshurnikov, Andrey; Jakobsson, Martin
Gemery, L., Cronin, T. M., Poirier, R. K., Pearce, C., Barrientos, N., O’Regan, M., … Jakobsson, M. (2017). Central Arctic Ocean paleoceanography from ~ 50 ka to present, on the basis of ostracode faunal assemblages from SWERUS 2014 expedition. Climate of the Past Discussions, 1–28.

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Year Published: 2017

Increased hurricane frequency near Florida during Younger Dryas Atlantic Meridional Overturning Circulation slowdown

The risk posed by intensification of North Atlantic hurricane activity remains controversial, in part due to a lack of available storm proxy records that extend beyond the relatively stable climates of the late Holocene. Here we present a record of storm-triggered turbidite deposition offshore the Dry Tortugas, south Florida, USA, that spans...

Toomey, Michael; Korty, Robert L.; Donnelly, Jeffrey P.; van Hengstum, Peter J.; Curry, William B.
Michael R. Toomey, Robert L. Korty, Jeffrey P. Donnelly, Peter J. van Hengstum, William B. Curry; Increased hurricane frequency near Florida during Younger Dryas Atlantic Meridional Overturning Circulation slowdown. Geology ; 45 (11): 1047–1050. doi: https://doi.org/10.1130/G39270.1

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Year Published: 2017

Rapid exhumation of Cretaceous arc-rocks along the Blue Mountains restraining bend of the Enriquillo-Plantain Garden fault, Jamaica, using thermochronometry from multiple closure systems

The effect of rapid erosion on kinematic partitioning along transpressional plate margins is not well understood, particularly in highly erosive climates. The Blue Mountains restraining bend (BMRB) of eastern Jamaica, bound to the south by the left-lateral Enriquillo-Plantain Garden fault (EPGF), offers an opportunity to test the effects of highly...

Cochran, William J.; Spotila, James A.; Prince, Philip S.; McAleer, Ryan J.
Cochran, W. J., Spotila, J. A., Prince, P.S., and McAleer R.J., 2017, Rapid exhumation of Cretaceous arc-rocks along the Blue Mountains restraining bend of the Enriquillo-Plantain Garden fault, Jamaica, using thermochronometry from multiple closure systems, Tectonophysics, https://doi.org/10.1016/j.tecto.2017.09.021;

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Year Published: 2017

Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins

Deglacial (12.8–10.7 ka) sea level history on the East Siberian continental shelf and upper continental slope was reconstructed using new geophysical records and sediment cores taken during Leg 2 of the 2014 SWERUS-C3 expedition. The focus of this study is two cores from Herald Canyon, piston core SWERUS-L2-4-PC1 (4-PC1) and multicore SWERUS-L2-4-...

Cronin, Thomas M.; O'Regan, Matt; Pearce, Christof; Gemery, Laura; Toomey, Michael; Semiletov, Igor
Cronin, T. M., O'Regan, M., Pearce, C., Gemery, L., Toomey, M., Semiletov, I., and Jakobsson, M.: Deglacial sea-level history of the East Siberian Sea Margin, Clim. Past Discuss.,in review, 2017.

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Year Published: 2017

Biostratigraphic and morphometric analyses of specimens from the calcareous nannofossil genus Tribrachiatus

Biostratigraphic and morphometric analyses of calcareous nannofossil assemblages from one outcrop and two cored sections of lower Eocene sediments reveal the presence of two new species: Tribrachiatus lunatus sp. nov., and Tribrachiatus absidatus sp. nov. Differences between the new species and Tribrachiatus orthostylus are discussed. The first...

Self-Trail, Jean M.; Seefelt, Ellen L.; Shepherd, Claire L.; Martin, Victoria A.
Self-Trail, J.M., Seefelt, E.L., Shepherd, C. L., and Martin, V.A., 2017. Biostratigraphic and morphometric analyses of specimens from the calcareous nannofossil genus Tribrachiatus: Journal of Nannoplankton Research, v. 37 (2-3), p. 177-188.

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Year Published: 2017

Geologic map of the Dusar area, Herat Province, Afghanistan; Modified from the 1973 original map compilations of V.I. Tarasenko and others

The geologic maps and cross sections presented in this report are redrafted and modified versions of the Geologic map and map of useful minerals of the Dusar area (scale 1:50,000) and Geologic sketch map of the Dusar and Namak-sory ore occurrences (scale 1:10,000), located in the Herat Province, Afghanistan. The original maps and cross sections...

Tucker, Robert D.; Stettner, Will R.; Masonic, Linda M.; Bogdanow, Anya K.
Tucker, R.D., Stettner, W.R., Masonic, L.M., and Bogdanow, A.K., comps., 2017, Geologic map of the Dusar area, Herat Province, Afghanistan; Modified from the 1973 original map compilations of V.I. Tarasenko and others: U.S. Geological Survey Open-File Report 2017–1126, 1 sheet, scales 1:50,000 and 1:10,000, https://doi.org/10.3133/ofr20171126.

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Year Published: 2017

Application of paleoecology to ecosystem restoration: A case study from south Florida’s estuaries

Paleoecological analyses of biotic assemblages from cores collected throughout south Florida’s estuaries indicate gradually increasing salinities over approximately the last 2000 years, consistent with rising sea level. Around the beginning of the twentieth century these gradual patterns of change began to shift, corresponding to the beginning of...

Weckström, Kaarina; Saunders, Krystyna M.; Gell, Peter A.; Skilbeck, C. Gregory; Wingard, G. Lynn

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Year Published: 2017

A transect through Vermont’s most famous volcano – Mount Ascutney: GSNH Summer 2017 Field Trip

No abstract available.

Walsh, Gregory J.
Walsh, G.J., 2017, A transect through Vermont’s most famous volcano – Mount Ascutney: Geological Survey of New Hampshire, Granite State Geologist, September 2017, no. 98, 4 p.,http://www.gsnh.org/uploads/9/2/8/6/92861090/gsnh_mnt_ascutney_summer_2017_field_trip_guidebook.pdf

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Year Published: 2017

Hypogene caves of the central Appalachian Shenandoah Valley in Virginia

Several caves in the Shenandoah Valley in Virginia show evidence for early hypogenic conduit development with later-enhanced solution under partly confined phreatic conditions guided by geologic structures. Many (but not all) of these caves have been subsequently invaded by surface waters as a result of erosion and exhumation. Those not so...

Doctor, Daniel H.; Orndorff, Wil
Doctor, D.H. and Orndorff, W. (2017) Hypogene Caves of the Central Appalachian Shenandoah Valley in Virginia, in: Klimchouk, A., Palmer, A., De Waele, J., Auler, A., and Audra, P., eds., Hypogene Karst Regions and Caves of the World: New York, Springer, ISBN: 978-319-53347-6, doi: 10.1007/978-3-319-53348-3

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Year Published: 2017

New insight into the origin of manganese oxide ore deposits in the Appalachian Valley and Ridge of northeastern Tennessee and northern Virginia, USA

Manganese oxide deposits have long been observed in association with carbonates within the Appalachian Mountains, but their origin has remained enigmatic for well over a century. Ore deposits of Mn oxides from several productive sites located in eastern Tennessee and northern Virginia display morphologies that include botryoidal and branching...

Carmichael, Sarah K.; Doctor, Daniel H.; Wilson, Crystal G.; Feierstein, Joshua; McAleer, Ryan J.
Sarah K. Carmichael, Daniel H. Doctor, Crystal G. Wilson, Joshua Feierstein, and Ryan J. McAleer New insight into the origin of manganese oxide ore deposits in the Appalachian Valley and Ridge of northeastern Tennessee and northern Virginia, USA Geological Society of America Bulletin, B31682.1, first published on May 11, 2017,

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Year Published: 2017

Linkages and feedbacks in orogenic systems: An introduction

Orogenic processes operate at scales ranging from the lithosphere to grain-scale, and are inexorably linked. For example, in many orogens, fault and shear zone architecture controls distribution of heat advection along faults and also acts as the primary mechanism for redistribution of heat-producing material. This sets up the thermal structure of...

Thigpen, J. Ryan; Law, Richard D.; Merschat, Arthur J.; Stowell, Harold
Thigpen, J.R., Law, R.D., Merschat, A.J., and Stowell, H.H., 2017, Linkages and feedbacks in orogenic systems: An introduction, in Law, R.D., Thigpen, J.R., Merschat, A.J., and Stowell, H.H., eds., Linkages and Feedbacks in Orogenic Systems: Geological Society of America Memoir 213, p. vii–xv, doi:10.1130/2017.1213(00).

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Year Published: 2017

Temporal and spatial distribution of Paleozoic metamorphism in the southern Appalachian Blue Ridge and Inner Piedmont delimited by ion microprobe U-Pb ages of metamorphic zircon

Ion microprobe U-Pb zircon rim ages from 39 samples from across the accreted terranes of the central Blue Ridge, eastward across the Inner Piedmont, delimit the timing and spatial extent of superposed metamorphism in the southern Appalachian orogen. Metamorphic zircon rims are 10–40 µm wide, mostly unzoned, and dark gray to black or bright white...

Merschat, Arthur J.; Bream, Brendan R.; Huebner, Matthew T.; Hatcher, Robert D.; Miller, Calvin F.
Merschat, A.J., Bream, B.R., Huebner, M.T., Hatcher, R.D., Jr., and Miller, C.F., 2017, Temporal and spatial distribution of Paleozoic metamorphism in the southern Appalachian Blue Ridge and Inner Piedmont delimited by ion microprobe U-Pb ages of metamorphic zircon, in Law, R.D., Thigpen, J.R., Merschat, A.J., and Stowell, H.H., eds., Linkages and Feedbacks in Orogenic Systems: Geological Society of America Memoir 213, p. 199–254, doi:10.1130/2017.1213(10).