globalchange  > 影响、适应和脆弱性
DOI: 10.5194/cp-14-303-2018
Scopus记录号: 2-s2.0-85043470721
论文题名:
Synchronizing early Eocene deep-sea and continental records - Cyclostratigraphic age models for the Bighorn Basin Coring Project drill cores
作者: Westerhold T.; Röhl U.; Wilkens R.H.; Gingerich P.D.; Clyde W.C.; Wing S.L.; Bowen G.J.; Kraus M.J.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2018
卷: 14, 期:3
起始页码: 303
结束页码: 319
语种: 英语
Scopus关键词: carbon isotope ; chronology ; chronostratigraphy ; deep-sea organism ; eccentricity ; Eocene ; Ocean Drilling Program ; paleoclimate ; precession ; terrestrial ecosystem ; timescale ; Atlantic Ocean ; Bighorn Basin ; United States ; Walvis Ridge ; Mammalia
英文摘要: A consistent chronostratigraphic framework is required to understand the effect of major paleoclimate perturbations on both marine and terrestrial ecosystems. Transient global warming events in the early Eocene, at 56-54g Ma, show the impact of large-scale carbon input into the ocean-atmosphere system. Here we provide the first timescale synchronization of continental and marine deposits spanning the Paleocene-Eocene Thermal Maximum (PETM) and the interval just prior to the Eocene Thermal Maximum 2 (ETM-2). Cyclic variations in geochemical data come from continental drill cores of the Bighorn Basin Coring Project (BBCP, Wyoming, USA) and from marine deep-sea drilling deposits retrieved by the Ocean Drilling Program (ODP). Both are dominated by eccentricity-modulated precession cycles used to construct a common cyclostratigraphic framework. Integration of age models results in a revised astrochronology for the PETM in deep-sea records that is now generally consistent with independent 3He age models. The duration of the PETM is estimated at ĝ1/4 200g kyr for the carbon isotope excursion and ĝ1/4 120g kyr for the associated pelagic clay layer. A common terrestrial and marine age model shows a concurrent major change in marine and terrestrial biota ĝ1/4 200g kyr before ETM-2. In the Bighorn Basin, the change is referred to as Biohorizon B and represents a period of significant mammalian turnover and immigration, separating the upper Haplomylus-Ectocion Range Zone from the Bunophorus Interval Zone and approximating the Wa-4-Wa-5 land mammal zone boundary. In sediments from ODP Site 1262 (Walvis Ridge), major changes in the biota at this time are documented by the radiation of a "second generation" of apical spine-bearing sphenolith species (e.g., S. radians and S. editus), the emergence of T. orthostylus, and the marked decline of D. multiradiatus. © Author(s) 2018.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109585
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: MARUM, Center for Marine Environmental Sciences, University of Bremen, Bremen, 28359, Germany; Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, HI 96822, United States; Museum of Paleontology, University of Michigan, Ann Arbor, MI 48109-1079, United States; Department of Earth Sciences, University of New Hampshire, 56 College Rd., Durham, NH 03824, United States; Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, P.O. Box 37012, Washington, DC 20013, United States; Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, United States; Department of Geological Sciences, University of Colorado at Boulder, UCB 399, Boulder, CO 80309, United States

Recommended Citation:
Westerhold T.,Röhl U.,Wilkens R.H.,et al. Synchronizing early Eocene deep-sea and continental records - Cyclostratigraphic age models for the Bighorn Basin Coring Project drill cores[J]. Climate of the Past,2018-01-01,14(3)
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