End-Permian mass extinction and palaeoenvironmental changes in Neotethys: Evidence from an oceanic carbonate section in southwestern Tibet
End-Permian mass extinction and palaeoenvironmental changes in Neotethys: Evidence from an oceanic carbonate section in southwestern Tibet
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二叠纪末大规模灭绝与新特提斯古环境变化：来自西藏西南部大洋碳酸盐岩剖面的证据
DOI：
10.1016/j.gloplacha.2010.03.007
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发表时间：
2010-08
影响因子：
3.9
通讯作者：
Ueno, K.
中科院分区：
文献类型：
--
作者：
Cao, Chang-qun;Zhang, Yi-chun;Li, Wen-zhong;Chen, Jun;Wu, Ya-sheng;Shi, G. R.;Zhang, Hua;Henderson, C. M.;Wang, Xiang-dong;Shen, Shu-zhong;Wang, Xiao-juan;Wang, Yue;Ueno, K.
层序厚度在350米以上，由干驿马组和下兰城曲峡组组成。罗平系（晚二叠世）干逸马组为以科拉尼拉颗粒岩为主的红色碳酸盐岩化石，以窗/海绵/珊瑚框架岩和挡流岩为主的礁相为主。罗平涧吉义马组已鉴定出156种。Gyanyima剖面腕足类、介形虫、绢珊瑚和有孔虫的复合范围表明二叠纪海洋生物的进化和多样化持续到二叠纪末，在二叠纪-三叠纪界线（PTB）附近发生了一次主要的动物灭绝，与δ13Ccarb负移2-3‰相吻合。灭绝的时间和加速模式以及负δ - 13碳偏移与许多先前记录的大陆架环境剖面的报告在很大程度上相似。详细的岩相分析表明，赣驿马剖面晚二叠世礁岩相明显被介形类/海红类包岩/颗粒岩所取代，早三叠世牙形刺突发性丰富。然后是血栓性微生物岩、叠层石、含有丰富球形微生物的岩包，以及潮汐和潮间带相的双壳类/氨类岩包。因此，这种独特的岩相和生物相变化表明，整个PTB存在着巨大的动物群落和环境变化。在演替的最上部，暖水动物群和冷水动物群的交替也表明了在P-T区间内明显的古气候波动。干一马组下部以华夏化石为主，气候温暖。随后是一个温和的降温事件，许多明显的冈瓦纳周边元素的出现和复合珊瑚的缺失表明了这一点。最新的长兴期以与华夏相似的暖水动物元素为特征，δ13Ccarb负移，表明在二叠纪末期发生了快速变暖事件，火山活动比我们之前认为的要广泛得多。
This paper documents a new Permian–Triassic carbonate sequence which recorded the end-Permian mass extinction in the isolated oceanic setting of Neotethys in southwestern Tibet, China. The sequence is over 350m thick and consists of the Gyanyima and the Lower Lanchengquxia formations in ascending order. The Lopingian (Late Permian) Gyanyima Formation is composed of fossiliferous reddish carbonates dominated by Colaniella grainstone and reef facies including fenestrate/sponge/coral framestone and bafflestone. 156 species are recognized from the Lopingian Gyanyima Formation. Composite ranges of brachiopods, ostracods, rugose corals and foraminifers at the Gyanyima Section suggest that evolution and diversification of Permian marine organisms continued to the end-Permian preceding a major faunal extinction close to the Permian–Triassic boundary (PTB), coincident with a 2–3‰ negative shift of δ13Ccarb. The timing and accelerating extinction pattern and the negative δ13Ccarbexcursion are largely comparable with those reported from many previously-documented sections on continental shelf environments. Based on a detailed lithofacies analysis, the latest Permian reefal facies is sharply replaced by ostracod/crinoid packstone/grainstone with abrupt abundant occurrences of Early Triassic conodonts at the Gyanyima Section. This is then followed by thrombolitic microbialite, stromatolite, packstone containing abundant spherical microbes, and bivalve/ammonoid packstone of tidal and intertidal facies. This distinct lithofacies and biofacies shift would, therefore, suggest a dramatic faunal community and environmental change across the PTB. Distinct palaeoclimate fluctuations through the P–T interval are also indicated by the alternation of warm- and cool-water faunas through the uppermost part of the succession. The lower part of the Gyanyima Formation is characterized by a warm condition as indicated by Cathaysian-dominated fossils. This was then followed by a mild cooling event as suggested by the occurrence of many distinct peri-Gondwanan elements and absence of compound corals. The latest Changhsingian is characterized exclusively by warm-water faunal elements of Cathaysian affinities, together with the negative shift of δ13Ccarb, suggesting a rapid warming event at the very end of Permian in association with much more widespread volcanic activities than we thought before.
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影响因子：
2.2
作者：
S. Shen;Changqun Cao;G. Shi;Xiangdong Wang;Shilong Mei
通讯作者：
S. Shen;Changqun Cao;G. Shi;Xiangdong Wang;Shilong Mei
影响因子：
5.8
作者：
R. Twitchett;L. Krystyn;A. Baud;J. Wheeley;S. Richoz
通讯作者：
R. Twitchett;L. Krystyn;A. Baud;J. Wheeley;S. Richoz
影响因子：
56.9
作者：
L. Becker;R. Poreda;A. Basu;K. Pope;T. Harrison;C. Nicholson;R. Iasky
通讯作者：
L. Becker;R. Poreda;A. Basu;K. Pope;T. Harrison;C. Nicholson;R. Iasky
影响因子：
1.6
作者：
S. Shen;N. Archbold;G. Shi;Zhong‐Qiang Chen
通讯作者：
S. Shen;N. Archbold;G. Shi;Zhong‐Qiang Chen
影响因子：
5.3
作者：
Masaaki Musashi;Y. Isozaki;T. Koike;R. Kreulen
通讯作者：
Masaaki Musashi;Y. Isozaki;T. Koike;R. Kreulen