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DOI	10.1016/j.earscirev.2019.01.023
	The end-Ordovician mass extinction: A single-pulse event?
	Wang G.; Zhan R.; Percival I.G.
发表日期	2019
ISSN	0012-9014
起始页码	15
结束页码	33
卷号	192
英文摘要	The end-Ordovician mass extinction (EOME) is widely interpreted as consisting of two pulses associated with the onset and demise of the Gondwana glaciation, respectively, with the second pulse eradicating the distinctive, glacially related Hirnantian benthic biota (HBB). A global review of occurrence data of latest Ordovician benthic marine organisms reveals that virtually all warm-water benthic assemblages previously assigned to the HBB comprise two distinct and clearly postglacial faunas, both younger (middle and late Hirnantian, respectively) than the cool-water Hirnantia fauna (latest Katian to early Hirnantian). The newly recognised three Transitional Benthic Faunas (i.e., TBFs 1–3) can be closely tied to graptolite, conodont, and chitinozoan biozonations, the Hirnantian Isotope Carbon Excursion (HICE), and the glaciation, thereby providing an integrated, much higher-resolution timescale for understanding the tempo and nature of the EOME. At this finer resolution, we postulate a more profound impact of the first pulse of the EOME than hitherto envisaged, as evidenced by opportunistic expansion of the Hirnantia fauna globally and the complete absence of metazoan reefs in its immediate aftermath. We also argue, based on high-quality data from well-documented benthic groups in South China (i.e., brachiopods, tabulate and rugose corals, trilobites, and sponges), that the magnitude of the second pulse of the EOME caused by the deglaciation has been overestimated because the two postglacial faunas (i.e., TBFs 2–3) were part of a subsequent recovery phase of marine ecosystems rather than contributing to biodiversity decline. Thus, it is more plausible to reinterpret the EOME as a single-pulse, rapid event that was followed by a prolonged initial recovery intermittently impeded by climatic shocks through the Hirnantian, prior to the onset of a progressive reestablishment of marine ecosystems during the early Silurian (Rhuddanian and Aeronian) associated with an overall amelioration of climatic conditions. © 2019 The Authors
英文关键词	End-Ordovician; Glaciation; Hirnantian; Mass extinction; Recovery; Stratigraphy
语种	英语
scopus关键词	biostratigraphy; biozonation; climate variation; glaciation; Gondwana; Hirnantian; marine ecosystem; mass extinction; Ordovician; paleobiogeography; paleoceanography; paleoclimate; paleoenvironment; Anthozoa; Brachiopoda; Chitinozoa; Metazoa; Trilobitomorpha
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209925
作者单位	State Key Laboratory of Palaeobiology and Stratigraphy, Center for Excellence in Life and Paleoenvironment, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, China; University of Chinese Academy of Sciences, Beijing, China; Geological Survey of New South Wales, 947-953 Londonderry Road, Londonderry, NSW 2753, Australia
推荐引用方式 GB/T 7714	Wang G.,Zhan R.,Percival I.G.. The end-Ordovician mass extinction: A single-pulse event?[J],2019,192.
APA	Wang G.,Zhan R.,&Percival I.G..(2019).The end-Ordovician mass extinction: A single-pulse event?.EARTH-SCIENCE REVIEWS,192.
MLA	Wang G.,et al."The end-Ordovician mass extinction: A single-pulse event?".EARTH-SCIENCE REVIEWS 192(2019).