气候变化领域集成服务门户(CCPortal): Early Paleogene fluvial regime shift in response to global warming: A subtropical record from the Tornillo Basin, west Texas, USA

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DOI	10.1130/B31872.1
	Early Paleogene fluvial regime shift in response to global warming: A subtropical record from the Tornillo Basin, west Texas, USA
	Bataille C.P.; Ridgway K.D.; Colliver L.; Liu X.-M.
发表日期	2019
ISSN	167606
起始页码	299
结束页码	317
卷号	131 期号:2021-01-02
英文摘要	The early Paleogene was a dynamic period marked by long-term climatic trends and rapid climate events superimposed upon a hot greenhouse state. The response of the terrestrial hydrological cycle to these climate variations can be investigated at the continental scale by analysis of Paleogene strata in Laramide basins and the Gulf of Mexico. New U-Pb geochronologic data from detrital zircons in Paleogene fluvial strata of the Tornillo Basin in west Texas indicate relatively continuous deposition from 63 to 47 Ma. The combination of detrital zircon ages with existing carbon isotope chemostratigraphic data allows us to revise the age model of these strata and to correlate stratigraphic changes with Paleogene climate variations. Sedimentologic data indicate that, during the Paleocene (63-55.5 Ma), high-sinuosity, fluvial systems meandered on a forested floodplain with well-developed soils and swamps. The fluvial regime changed abruptly to lowsinuosity, braided fluvial systems with floodplains characterized by intermittent wetting at the Paleocene-Eocene thermal maximum (55.5 Ma). Braided fluvial regimes persisted thereafter and culminated during the early Eocene climate optimum (52-50 Ma) with deposition of a coarse sheet of sand and gravel. We interpret the transition from meandering to braided fluvial systems as a shift in discharge and sediment supply associated with the more seasonal precipitation of the hot, subtropical monsoonal climate of the early Eocene. After 54 Ma, this shift in fluvial regime is superimposed by an upwardcoarsening grain-size trend probably driven by enhanced regional Laramide tectonism. These data provide the first reconstruction of Paleogene subtropical fluvial dynamics in western North America and correlate with regional and global changes in Paleogene climate and landscapes. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184981
作者单位	Department of Earth and Environmental Science, University of Ottawa, Ottawa, ON K1N 6N5, Canada; Department of Geological Sciences, University of North Carolina, Chapel Hill, NC 27514, United States; Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN 47907, United States
推荐引用方式 GB/T 7714	Bataille C.P.,Ridgway K.D.,Colliver L.,et al. Early Paleogene fluvial regime shift in response to global warming: A subtropical record from the Tornillo Basin, west Texas, USA[J],2019,131(2021-01-02).
APA	Bataille C.P.,Ridgway K.D.,Colliver L.,&Liu X.-M..(2019).Early Paleogene fluvial regime shift in response to global warming: A subtropical record from the Tornillo Basin, west Texas, USA.Bulletin of the Geological Society of America,131(2021-01-02).
MLA	Bataille C.P.,et al."Early Paleogene fluvial regime shift in response to global warming: A subtropical record from the Tornillo Basin, west Texas, USA".Bulletin of the Geological Society of America 131.2021-01-02(2019).