Florence Bascom Geoscience Center

Publications

Filter Total Items: 519
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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).

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Year Published: 2017

Reconstructing Common Era relative sea-level change on the Gulf Coast of Florida

To address a paucity of Common Era data in the Gulf of Mexico, we reconstructed ~ 1.1 m of relative sea-level (RSL) rise over the past ~ 2000 years at Little Manatee River (Gulf Coast of Florida, USA). We applied a regional-scale foraminiferal transfer function to fossil assemblages preserved in a core of salt-marsh peat and...

Gerlach, Matthew J.; Engelhart, Simon E.; Kemp, Andrew C.; Moyer, Ryan P.; Smoak, Joseph M.; Bernhardt, Christopher E.; Cahill, Niamh
Marine Geology, 390 (2017) 254-269

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Year Published: 2017

Characterizing meteorological and hydrologic conditions associated with shallow landslide initiation in the coastal bluffs of the Atlantic Highlands, New Jersey

Meteorological and hydrologic conditions associated with shallow landslide initiation in the coastal bluffs of the Atlantic Highlands, New Jersey remain undocumented despite a history of damaging slope movement extending back to at least 1903. This study applies an empirical approach to quantify the rainfall conditions leading to shallow...

De Graff, Jerome V.; Shakoor, Abdul; Ashland, Francis; Fiore, Alex R.; Reilly, Pamela A.
Ashland, F.X., Fiore, A.R., and Reilly, P.A., 2017, Characterizing meteorological and hydrologic conditions associated with shallow landslide initiation in the coastal bluffs of the Atlantic Highlands, New Jersey, in De Graff, J.V., and Shakur, A., eds. Landslides: Putting Experience, Knowledge and Emerging Technologies into Practice: Proceedings of the 3rd North American Symposium on Landslides, Roanoke, V.A., June 4–8, 2017, Association of Environmental & Engineering Geologists Special Publication 27, p. 461-472, ISBN: 978-0-9897253-7-8

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Year Published: 2017

Post-glacial flooding of the Bering Land Bridge dated to 11 cal ka BP based on new geophysical and sediment records

The Bering Strait connects the Arctic and Pacific oceans and separates the North American and Asian landmasses. The presently shallow ( ∼  53 m) strait was exposed during the sea level lowstand of the last glacial period, which permitted human migration across a land bridge today referred to as the Bering Land Bridge. Proxy studies (stable isotope...

Jakobsson, Martin; Pearce, Christof; Cronin, Thomas M.; Backman, Jan; Anderson, Leif G.; Barrientos, Natalia; Bjork, Goran; Coxhall, Helen; de Boer, Agatha; Mayer, Larry; Morth, Carl-Magnus; Nilsson, Johan; Rattray, Jayne; Sranne, Christian; Semiletov, Igor; O'Regan, Matt
Jakobsson, M., Pearce, C., Cronin, T. M., Backman, J., Anderson, L. G., Barrientos, N., … O'Regan, M. (2017). Post-glacial flooding of the Beringia Land Bridge dated to 11,000 cal yrs BP based on new geophysical and sediment records. Climate of the Past Discussions, 1–22

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Year Published: 2017

Shallow marine response to global climate change during the Paleocene-Eocene Thermal Maximum, Salisbury Embayment, USA

The Paleocene-Eocene Thermal Maximum (PETM) was an interval of extreme warmth that caused disruption of marine and terrestrial ecosystems on a global scale. Here we examine the sediments, flora, and fauna from an expanded section at Mattawoman Creek-Billingsley Road (MCBR) in Maryland and explore the impact of warming at a nearshore shallow marine...

Self-Trail, Jean M.; Robinson, Marci M.; Bralower, Timothy J.; Sessa, Jocelyn A.; Hajek, Elizabeth A.; Kump, Lee R.; Trampush, Sheila M.; Willard, Debra A.; Edwards, Lucy E.; Powars, David S.; Wandless, Gregory A.
Self-Trail, J.M., et al., (2017), Shallow marine response to global climate change during the Paleocene-Eocene Thermal Maximum, Salisbury Embayment, USA, Paleoceanography, 32, doi:10.1002/2017PA003096

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Year Published: 2017

Mapping informal small-scale mining features in a data-sparse tropical environment with a small UAS

This study evaluates the use of a small unmanned aerial system (UAS) to collect imagery over artisanal mining sites in West Africa. The purpose of this study is to consider how very high-resolution imagery and digital surface models (DSMs) derived from structure-from-motion (SfM) photogrammetric techniques from a small UAS can fill the gap in...

Chirico, Peter G.; Dewitt, Jessica D.
Chirico, P.G. and DeWitt, J.D., 2017, Mapping informal small-scale mining features in a data-sparse tropical environment with a small UAS. Journal of Unmanned Vehicle Systems. Vol. 5 Iss. 3). pg. 69-91.

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Year Published: 2017

The role of paleoecology in restoration and resource management—The past as a guide to future decision-making: Review and example from the Greater Everglades Ecosystem, U.S.A

Resource managers around the world are challenged to develop feasible plans for sustainable conservation and/or restoration of the lands, waters, and wildlife they administer—a challenge made greater by anticipated climate change and associated effects over the next century. Increasingly, paleoecologic and geologic archives are being used to...

Wingard, G. Lynn; Bernhardt, Christopher E.; Wachnicka, Anna
Wingard GL, Bernhardt CE and Wachnicka AH (2017) The Role of Paleoecology in Restoration and Resource Management—The Past As a Guide to Future Decision-Making: Review and Example from the Greater Everglades Ecosystem, U.S.A. Front. Ecol. Evol. 5:11.

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Year Published: 2017

Application of molluscan analyses to the reconstruction of past environmental conditions in estuaries: Chapter 15

Molluscs possess a number of attributes that make them an excellent source of past environmental conditions in estuaries: they are common in estuarine environments; they typically have hard shells and are usually well preserved in sediments; they are relatively easy to detect in the environment; they have limited mobility as adults; they grow by...

Wingard, G. Lynn; Surge, Donna
Wingard, G.L. and Surge, D. 2017. Application of Molluscan Analyses to the Reconstruction of Past Environmental Conditions in Estuaries. In K. Weckstrom, K.M. Saunders, P.A. Gell, C.G. Skilbeck (editors), Applications of Paleoenvironmental Techniques in Estuarine Studies, v. 20 of Developments in Paleoenvironmental Research, p. 357-387.

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Year Published: 2017

Olivine-melt relationships and syneruptive redox variations in the 1959 eruption of Kīlauea Volcano as revealed by XANES

The 1959 summit eruption of Kīlauea Volcano exhibited high lava fountains of gas-rich, primitive magma, containing olivine + chromian spinel in highly vesicular brown glass. Microprobe analysis of these samples shows that euhedral rims on olivine phenocrysts, in direct contact with glass, vary significantly in forsterite (Fo) content, at...

Helz, Rosalind L.; Cottrell, Elizabeth; Brounce, Maryjo N.; Kelley, Katherine A.
Helz, R.T., Cottrell, E., Brounce, M. N., and Kelley, K.A., 2017, Olivine-Melt Relationships and Syneruptive Redox Variations in the 1959 Eruption of Kīlauea Volcano as Revealed by XANES: Bulletin of Volcanology and Geothermal Research, v. 333-334, p. 1-14. http://dx.doi.org/10.1016/j.volgeores.2016.12.006

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Year Published: 2017

Soils as relative-age dating tools

Soils develop at the earth's surface via multiple processes that act through time. Precluding burial or disturbance, soil genetic horizons form progressively and reflect the balance among formation processes, surface age, and original substrate composition. Soil morphology provides a key link between process and time (soil age), enabling soils to...

Markewich, Helaine Walsh; Pavich, Milan J.; Wysocki, Douglas A.
Markewich, H., Pavich, M. J. and Wysocki, D. A. 2017. Soils as Relative-Age Dating Tools. The International Encyclopedia of Geography. 1–14.