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Clay mineralogical constraints on weathering in response to early Eocene hyperthermal events in the Bighorn Basin, Wyoming (Western Interior, USA)

2017; Geological Society of America; Volume: 129; Issue: 7-8 Linguagem: Inglês

10.1130/b31515.1

1943-2674

Chaowen Wang, Rieko Adriaens, Hanlie Hong, Jan Elsen, Noël Vandenberghe, Lucas Joost Lourens, Philip D. Gingerich, Hemmo A. Abels,

Geology and Paleoclimatology Research

Research Article| July 01, 2017 Clay mineralogical constraints on weathering in response to early Eocene hyperthermal events in the Bighorn Basin, Wyoming (Western Interior, USA) Chaowen Wang; Chaowen Wang † 1Gemmological Institute, China University of Geosciences, Wuhan, 430074, P.R. China2Department of Earth Sciences, Utrecht University, Heidelberglaan 2, 3584 CS, Utrecht, Netherlands †Corresponding authors: cwwang_cug@aliyun.com, h.a.abels@tudelft.nl. Search for other works by this author on: GSW Google Scholar Rieko Adriaens; Rieko Adriaens 3Department Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Leuven, Belgium Search for other works by this author on: GSW Google Scholar Hanlie Hong; Hanlie Hong 4State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, P.R. China Search for other works by this author on: GSW Google Scholar Jan Elsen; Jan Elsen 3Department Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Leuven, Belgium Search for other works by this author on: GSW Google Scholar Noël Vandenberghe; Noël Vandenberghe 3Department Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Leuven, Belgium Search for other works by this author on: GSW Google Scholar Lucas J. Lourens; Lucas J. Lourens 2Department of Earth Sciences, Utrecht University, Heidelberglaan 2, 3584 CS, Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar Philip D. Gingerich; Philip D. Gingerich 5Department Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA Search for other works by this author on: GSW Google Scholar Hemmo A. Abels Hemmo A. Abels † 6Department Geosciences and Engineering, Delft University of Technology, Stevinweg 1, 2628 CN, Delft, Netherlands †Corresponding authors: cwwang_cug@aliyun.com, h.a.abels@tudelft.nl. Search for other works by this author on: GSW Google Scholar Author and Article Information Chaowen Wang † 1Gemmological Institute, China University of Geosciences, Wuhan, 430074, P.R. China2Department of Earth Sciences, Utrecht University, Heidelberglaan 2, 3584 CS, Utrecht, Netherlands Rieko Adriaens 3Department Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Leuven, Belgium Hanlie Hong 4State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, P.R. China Jan Elsen 3Department Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Leuven, Belgium Noël Vandenberghe 3Department Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Leuven, Belgium Lucas J. Lourens 2Department of Earth Sciences, Utrecht University, Heidelberglaan 2, 3584 CS, Utrecht, Netherlands Philip D. Gingerich 5Department Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA Hemmo A. Abels † 6Department Geosciences and Engineering, Delft University of Technology, Stevinweg 1, 2628 CN, Delft, Netherlands †Corresponding authors: cwwang_cug@aliyun.com, h.a.abels@tudelft.nl. Publisher: Geological Society of America Received: 17 Feb 2016 Revision Received: 17 Jan 2017 Accepted: 07 Mar 2017 First Online: 06 Jul 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2017 Geological Society of America GSA Bulletin (2017) 129 (7-8): 997–1011. https://doi.org/10.1130/B31515.1 Article history Received: 17 Feb 2016 Revision Received: 17 Jan 2017 Accepted: 07 Mar 2017 First Online: 06 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Chaowen Wang, Rieko Adriaens, Hanlie Hong, Jan Elsen, Noël Vandenberghe, Lucas J. Lourens, Philip D. Gingerich, Hemmo A. Abels; Clay mineralogical constraints on weathering in response to early Eocene hyperthermal events in the Bighorn Basin, Wyoming (Western Interior, USA). GSA Bulletin 2017;; 129 (7-8): 997–1011. doi: https://doi.org/10.1130/B31515.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Series of transient greenhouse warming intervals in the early Eocene provide an opportunity to study the response of rock weathering and erosion to changes in temperature and precipitation. During greenhouse warming, chemical weathering is thought to increase the uptake of carbon from the atmosphere, while physical weathering and erosion control sediment supply. A large ancient greenhouse warming event is the Paleocene-Eocene Thermal Maximum at 56 Ma. In many coastal sites, an increase in the abundance of kaolinite clay during the Paleocene-Eocene Thermal Maximum is interpreted as the result of reworking from terrestrial strata due to enhanced runoff caused by increased seasonal precipitation and storminess during a time of decreased vegetation cover. In the continental interior of North America, Paleocene-Eocene Thermal Maximum paleosols show more intense pedogenesis and drying, which are indicated by deeply weathered and strongly oxidized soil profiles. The weathering and oxidation could be related to temperature and precipitation changes, but also to increased time available for weathering and increased soil permeability in coarser sediment.Here, we provide evidence for enhanced climate seasonality, increased erosion of proximal laterites and intrabasinal floodplain soils, and a potential slight increase in chemical weathering during the smaller early Eocene hyperthermals (Eocene Thermal Maximum 2, including H1 and H2) postdating the Paleocene-Eocene Thermal Maximum, for which no previous clay mineral data were available. Hyperthermal soil formation at the site of floodplain deposition causes a similar, insignificant clay mineralogical change as occurred during the background climates of the early Eocene by showing small increases in smectite and decreases in illite-smectite and illite. Remarkably, the detrital sediments during the hyperthermals show a similar pedogenic-like increase of smectite and decreases of mixed-layer illite-smectite and illite, while the kaolinite and chlorite proportions remained low and unchanged. Since sedimentation rates and provenance were similar during the events, enhanced smectite neoformation during soil formation in more proximal settings, and associated reworking, is the likely process causing this clay mineralogical change. The hundreds to thousands of year time scales at which individual paleosols were formed were probably too short for significant alteration of the rocks by in situ chemical weathering despite changing climates during the two post–Paleocene-Eocene Thermal Maximum greenhouse warming episodes. The relatively small signal, however, raises the question of whether increased chemical weathering can indeed be a strong negative feedback mechanism to enhanced greenhouse gas warming over the time scales at which these processes act. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.