气候变化领域集成服务门户(CCPortal): Vegetation and habitat change in Southern California through the middle miocene climatic optimum: Paleoenvironmental records from the Barstow Formation, Mojave Desert, USA

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DOI	10.1130/B35061.1
	Vegetation and habitat change in Southern California through the middle miocene climatic optimum: Paleoenvironmental records from the Barstow Formation, Mojave Desert, USA
	Loughney K.M.; Hren M.T.; Smith S.Y.; Pappas J.L.
发表日期	2020
ISSN	167606
起始页码	113
结束页码	129
卷号	132 期号:2021-01-02
英文摘要	The Barstow Formation (ca. 19-13 Ma) of southern California, USA, is a terrestrial sequence known for its diverse Miocene mammalian faunas. The formation spans the Middle Miocene Climatic Optimum (MMCO; 17-14 Ma) and offers the opportunity to study environmental change during the last major interval of global warming of the Cenozoic. We combined isotopic analyses of carbon and hydrogen from sedimentary n-alkanes and bulk soil organic matter with analysis of phytoliths (plant silica) and diatoms to reconstruct vegetation composition, habitat structure, and moisture dynamics through the formation. The δ13C and δD of long-carbon-chain n-alkanes derived from terrestrial plants and preserved in sediments of the Barstow Formation record drying prior to the MMCO and through the Middle Miocene Climatic Transition (MMCT; beginning ca. 14 Ma), punctuated by increased moisture in fluvial environments during the peak of the MMCO. Variable isotopic results relate to changes in moisture, driven partly by facies, vegetation composition, tectonic activity, and climatic variability coinciding with intervals of high pCO2. Phytolith assemblages are dominated by forest indicators in riparian habitats during the MMCO, and grass morphotypes constitute significant components of phytolith assemblages after the MMCO, indicating a shift to drier, more open-canopy habitats. The establishment of dry, wooded grasslands in the Barstow Basin coincides with the beginning of the MMCT and cooling sea-surface temperatures in the Pacific Ocean. Our results indicate that moist, closed-canopy habitats formed in southern California during climatic warming, followed by savannah during climatic cooling and the shift to seasonal precipitation regimes. © 2019 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/184869
作者单位	Department of Earth and Environmental Sciences, University of Michigan, 1100 North University Avenue, Ann Arbor, MI 48109, United States; Center for Integrative Geosciences, University of Connecticut, 354 Mansfield Road, Storrs, CT 06269, United States; Department of Mathematics, University of Michigan, 530 Church Street, Ann Arbor, MI 48109, United States
推荐引用方式 GB/T 7714	Loughney K.M.,Hren M.T.,Smith S.Y.,et al. Vegetation and habitat change in Southern California through the middle miocene climatic optimum: Paleoenvironmental records from the Barstow Formation, Mojave Desert, USA[J],2020,132(2021-01-02).
APA	Loughney K.M.,Hren M.T.,Smith S.Y.,&Pappas J.L..(2020).Vegetation and habitat change in Southern California through the middle miocene climatic optimum: Paleoenvironmental records from the Barstow Formation, Mojave Desert, USA.Bulletin of the Geological Society of America,132(2021-01-02).
MLA	Loughney K.M.,et al."Vegetation and habitat change in Southern California through the middle miocene climatic optimum: Paleoenvironmental records from the Barstow Formation, Mojave Desert, USA".Bulletin of the Geological Society of America 132.2021-01-02(2020).