Extinction-recovery pattern of level-bottom faunas across the Triassic-Jurassic boundary in Tibet: Implications for potential killing mechanisms
Hautmann, M.1; Stiller, F.2; Cai Huawei (蔡华伟)2; Sha Jingeng (沙金庚)2
2008-09-01
发表期刊PALAIOS
ISSN0883-1351
卷号23期号:9-10页码:711-718
摘要

Scarcity of fossiliferous boundary sections makes the Triassic-Jurassic biotic crisis the most enigmatic of the five major Phanerozoic faunal turnovers. We report a bivalve-dominated level-bottom fauna from the Triassic-Jurassic transition in southern Tibet, which is unique for two reasons: (1) it documents the faunal turnover across the system boundary without major facies changes, and (2) it provides paleobiological data from the immediate postextinction interval. In the extinction pattern, selectivity against burrowing suspension feeders and taxa with completely aragonitic shells emerges, but no major clades or ecological groups disappeared. The earliest postextinction fauna differs in three significant ways from typical survival faunas of other mass extinction events: (1) it was surprisingly diverse, (2) it was heterogeneous (Simpson D = 0.1078) without dominance of disaster taxa or opportunists, and (3) there was a prevalence of highly specialized, morphologically complex forms reaching normal growth sizes. In spite of these unusual features. extinction of typical Triassic taxa occurred comparatively sharply within the underlying beds. These findings support scenarios of relatively short environmental disturbances triggered by. the volcanic activity of the Central Atlantic Magmatic Province, which led to rapid extinction of taxa but did not impose ongoing environmental stress on the survival fauna. The nearly instantaneous recovery of level-bottom faunas is in sharp contrast to a prolonged reef eclipse, which probably indicates both higher extinction rates of reef-organisms and intrinsic limitations to the tempo of recovery due to their high level of co-evolution.

DOI10.2110/palo.2008.p08-005r
语种英语
关键词[WOS]Atlantic Magmatic Province ; Carbon-isotope Stratigraphy ; Mass-extinction ; Triassic/jurassic Boundary ; Southern Tibet ; Fossil Record ; Bivalves ; Evolution ; Volcanism ; Event
资助项目NSFC[40672012] ; NBRPC[2006CB806400] ; DFG[HA 3400/2] ; EU Marie Curie Intra-European Fellowship
WOS研究方向Geology ; Paleontology
WOS类目Geology ; Paleontology
WOS记录号WOS:000259765000013
项目资助者NSFC ; NBRPC ; DFG ; EU Marie Curie Intra-European Fellowship
出版者SEPM-SOC SEDIMENTARY GEOLOGY
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/178
专题中国科学院南京地质古生物研究所
其他
通讯作者Hautmann, M.
作者单位1.Univ Bristol, Dept Earth Sci, Bristol BS8 1RJ, Avon, England
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
推荐引用方式
GB/T 7714
Hautmann, M.,Stiller, F.,Cai Huawei ,et al. Extinction-recovery pattern of level-bottom faunas across the Triassic-Jurassic boundary in Tibet: Implications for potential killing mechanisms[J]. PALAIOS,2008,23(9-10):711-718.
APA Hautmann, M.,Stiller, F.,Cai Huawei ,&Sha Jingeng .(2008).Extinction-recovery pattern of level-bottom faunas across the Triassic-Jurassic boundary in Tibet: Implications for potential killing mechanisms.PALAIOS,23(9-10),711-718.
MLA Hautmann, M.,et al."Extinction-recovery pattern of level-bottom faunas across the Triassic-Jurassic boundary in Tibet: Implications for potential killing mechanisms".PALAIOS 23.9-10(2008):711-718.
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