气候变化领域集成服务门户(CCPortal): Paleo-environmental changes during the Middle–Late Ordovician transition on the Yangtze Platform; South China and their ecological implications

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DOI	10.1016/j.palaeo.2020.109991
	Paleo-environmental changes during the Middle–Late Ordovician transition on the Yangtze Platform; South China and their ecological implications
	Fang X.; Li W.; Zhang J.; Song Y.; Zhang Y.
发表日期	2020
ISSN	0031-0182
卷号	560
英文摘要	Rocks of Darriwilian and Sandbian age (Middle–Late Ordovician) record the extraordinary peak of the Great Ordovician Biodiversification Event (GOBE) and significant global environmental changes. To track paleo-environmental changes through this critical time, we have analyzed iron speciation, trace elements and total organic carbon in samples of the Miaopo Formation from an intra-shelf basin in South China. The results reveal moderate primary productivity and possible fluctuations in benthic redox. Upwelling during marine transgression is thought to have increased the availability of nutrients in surface waters, sustaining the biological pump. Enhanced export of organic matter would have consumed dissolved oxygen at depth, driving the system toward anoxia. However, it is also possible for deep-water renewal events to transfer more dissolved oxygen into the bottom water. Those proxies suggests high primary productivity and varying sea level (global and local), not benthic anoxia, as the driver of accumulated “black shale”. Thus, the local marine ecosystem thrived in this oxic intra-shelf basin, challenging the preexisting paradox that the high-diversity community flourished in an oxygen-depleted environment. © 2020
英文关键词	Black shale; Iron speciation; Productivity; Redox conditions; Redox-sensitive elements; Transgression
语种	英语
scopus关键词	dissolved oxygen; lithostratigraphy; marine ecosystem; Ordovician; organic matter; paleoenvironment; sea level change; sediment analysis; speciation (chemistry); total organic carbon; transgression; China; Yangtze Platform
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150317
作者单位	State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, 210008, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Earth and Planetary Sciences and NASA Astrobiology Institute Alternative Earths Team, University of California, Riverside, CA 92521, United States; Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Fang X.,Li W.,Zhang J.,等. Paleo-environmental changes during the Middle–Late Ordovician transition on the Yangtze Platform; South China and their ecological implications[J],2020,560.
APA	Fang X.,Li W.,Zhang J.,Song Y.,&Zhang Y..(2020).Paleo-environmental changes during the Middle–Late Ordovician transition on the Yangtze Platform; South China and their ecological implications.Palaeogeography, Palaeoclimatology, Palaeoecology,560.
MLA	Fang X.,et al."Paleo-environmental changes during the Middle–Late Ordovician transition on the Yangtze Platform; South China and their ecological implications".Palaeogeography, Palaeoclimatology, Palaeoecology 560(2020).