Search Results - "Them, Theodore R."

Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event by Them, Theodore R., Gill, Benjamin C., Selby, David, Gröcke, Darren R., Friedman, Richard M., Owens, Jeremy D.

“…Chemical weathering consumes atmospheric carbon dioxide through the breakdown of silicate minerals and is thought to stabilize Earth’s long-term climate…”
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Thallium isotopes reveal protracted anoxia during the Toarcian (Early Jurassic) associated with volcanism, carbon burial, and mass extinction by Them, Theodore R., Gill, Benjamin C., Caruthers, Andrew H., Gerhardt, Angela M., Gröcke, Darren R., Lyons, Timothy W., Marroquín, Selva M., Nielsen, Sune G., Alexandre, João P. Trabucho, Owens, Jeremy D.

“…For this study, we generated thallium (Tl) isotope records from two anoxic basins to track the earliest changes in global bottom water oxygen contents over the…”
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Impact of abrupt deglacial climate change on tropical Atlantic subsurface temperatures by Schmidt, Matthew W, Chang, Ping, Hertzberg, Jennifer E, Them, Theodore R, J, Link, Otto-Bliesner, Bette L

“…Both instrumental data analyses and coupled ocean-atmosphere models indicate that Atlantic meridional overturning circulation (AMOC) variability is tightly…”
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Mercury records covering the past 90 000 years from lakes Prespa and Ohrid, SE Europe by Paine, Alice R, Fendley, Isabel M, Frieling, Joost, Mather, Tamsin A, Lacey, Jack H, Wagner, Bernd, Robinson, Stuart A, Pyle, David M, Francke, Alexander, Them II, Theodore R, Panagiotopoulos, Konstantinos

“…The element mercury (Hg) is a key pollutant, and much insight has been gained by studying the present-day Hg cycle. However, many important processes within…”
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Rapid marine oxygen variability: Driver of the Late Ordovician mass extinction by Kozik, Nevin P., Young, Seth A., Newby, Sean M., Liu, Mu, Chen, Daizhao, Hammarlund, Emma U., Bond, David P. G., Them, Theodore R., Owens, Jeremy D.

“…The timing and connections between global cooling, marine redox conditions, and biotic turnover are underconstrained for the Late Ordovician. The second most…”
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Mercury as a proxy for volcanic emissions in the geologic record by Grasby, Stephen E., Them, Theodore R., Chen, Zhuoheng, Yin, Runsheng, Ardakani, Omid H.

“…Large igneous province (LIP) eruptions are increasingly considered to have driven mass extinction events throughout the Phanerozoic; however, uncertainties in…”
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Sediment Cores from White Pond, South Carolina, contain a Platinum Anomaly, Pyrogenic Carbon Peak, and Coprophilous Spore Decline at 12.8 ka by Moore, Christopher R., Brooks, Mark J., Goodyear, Albert C., Ferguson, Terry A., Perrotti, Angelina G., Mitra, Siddhartha, Listecki, Ashlyn M., King, Bailey C., Mallinson, David J., Lane, Chad S., Kapp, Joshua D., West, Allen, Carlson, David L., Wolbach, Wendy S., Them, Theodore R., Harris, M. Scott, Pyne-O’Donnell, Sean

“…A widespread platinum (Pt) anomaly was recently documented in Greenland ice and 11 North American sedimentary sequences at the onset of the Younger Dryas (YD)…”
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Mercury isotopes show vascular plants had colonized land extensively by the early Silurian by Yuan, Wei, Liu, Mu, Chen, Daizhao, Xing, Yao-Wu, Spicer, Robert A, Chen, Jitao, Them, 2nd, Theodore R, Wang, Xun, Li, Shizhen, Guo, Chuan, Zhang, Gongjing, Zhang, Liyu, Zhang, Hui, Feng, Xinbin

“…The colonization and expansion of plants on land is considered one of the most profound ecological revolutions, yet the precise timing remains controversial…”
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Sedimentary host phases of mercury (Hg) and implications for use of Hg as a volcanic proxy by Shen, Jun, Feng, Qinglai, Algeo, Thomas J., Liu, Jinling, Zhou, Chenyang, Wei, Wei, Liu, Jiangsi, Them, Theodore R., Gill, Benjamin C., Chen, Jiubin

“…•Sediment Hg can be hosted by the organic, sulfide or clay fractions.•Hg uptake by sulfide fraction favored under strongly euxinic conditions.•TS > 1.0% and…”
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Organic geochemistry of a lacustrine shale across the Toarcian Oceanic Anoxic Event (Early Jurassic) from NE China by Liu, Mu, Sun, Peng, Them, Theodore R., Li, Yongfei, Sun, Shouliang, Gao, Xiaoyong, Huang, Xin, Tang, Youjun

“…Thirty-nine shale samples of the Lower Jurassic Beipiao Formation from drill core ZK01 in the Jinyang Basin, NE China were investigated by comprehensive…”
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The glass ramp of Wrangellia; Late Triassic to Early Jurassic outer ramp environments of the McCarthy Formation, Alaska, U.S.A by Veenma, Yorick P, McCabe, Kayla, Caruthers, Andrew H, Aberhan, Martin, Golding, Martyn, Marroquin, Selva M, Owens, Jeremy D, Them, II, Gill, Benjamin C, Trabucho Alexandre, Joao P

“…The marine record of the Triassic-Jurassic boundary interval has been studied extensively in shallow-marine successions deposited along the margins of Pangea,…”
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Middle–Upper Ordovician (Darriwilian–Sandbian) paired carbon and sulfur isotope stratigraphy from the Appalachian Basin, USA: Implications for dynamic redox conditions spanning the peak of the Great Ordovician Biodiversification Event by Kozik, Nevin P., Young, Seth A., Bowman, Chelsie N., Saltzman, Matthew R., Them, Theodore R.

“…The Evans Ferry section from the Appalachian Basin of eastern North America has been analyzed for chemostratigraphic trends to elucidate possible causal…”
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Organic matter accumulations in the Santonian-Campanian (Upper Cretaceous) lacustrine Nenjiang shale (K2n) in the Songliao Basin, NE China: Terrestrial responses to OAE3? by Liu, Wei, Liu, Mu, Yang, Tao, Liu, Xin, Them, Theodore R., Wang, Kun, Bian, Congsheng, Meng, Qi'an, Li, Yongxin, Zeng, Xu, Zhao, Wenzhi

“…The local and/or global environmental effects on the organic matter (OM) enrichment in ancient sediments has long received extensive attention. The Upper…”
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Variations in microbial ecology during the Toarcian Oceanic Anoxic Event (Early Jurassic) in the Qiangtang Basin, Tibet: Evidence from biomarker and carbon isotopes by Liu, Mu, Ji, Changjun, Hu, Hewei, Xia, Guoqing, Yi, Haisheng, Them, Theodore R., Sun, Peng, Chen, Daizhao

“…Reduced animal diversity during mass extinctions is commonly associated with resurgence of microbial abundances. The Toarcian Oceanic Anoxic Event (T-OAE) was…”
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Upper Ordovician marine red limestones, Tarim Basin, NW China: A product of an oxygenated deep ocean and changing climate? by Liu, Mu, Chen, Daizhao, Zhou, Xiqiang, Tang, Dongjie, Them, Theodore R., Jiang, Maosheng

“…Marine red beds (MRB) have been commonly interpreted as products of bottom water oxygenation (or ventilation) and coeval perturbations of the global carbon…”
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A multi-proxy approach to constrain reducing conditions in the Baltic Basin during the late Silurian Lau carbon isotope excursion by Bowman, Chelsie N., Them, Theodore R., Knight, Marisa D., Kaljo, Dimitri, Eriksson, Mats E., Hints, Olle, Martma, Tõnu, Owens, Jeremy D., Young, Seth A.

“…The Silurian was a dynamic time characterized by significant climatic and sea level changes, biotic crises, and carbon cycle volatility. The largest magnitude…”
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