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Shajia, a new genus of polyconitid rudist from the Langshan Formation of the Lhasa block, Tibet, and its palaeogeographical implications

文献类型：期刊论文

作者Rao, Xin1,2,3; Skelton, Peter W.4; Sano, Shin-ichi5; Zhang, Yiqiang3; Zhang, Yichun1,2; Pan, Yanhong2,6; Cai, Huawei2,6; Peng, Bo7; Zhang, Tong8; Ma, Zhaoxiong8
刊名CRETACEOUS RESEARCH
出版日期2020
卷号105页码:13
关键词Lhasa block Langshan formation Mid-cretaceous Rudists Polyconitidae Yasin fauna
ISSN号0195-6671
DOI10.1016/j.cretres.2019.05.009
英文摘要A new polyconitid rudist Shajia tibetica gen. et sp. nov., of late Aptian to Albian age, is described from the Langshan Formation of Nyima County, northern Lhasa Block, Tibet. Though comparable in size and external morphology with Horiopleura haydeni Douville, which is a common endemic species in southwestern Asia, Shajia differs from the latter species in its possession of an inwardly inclined, instead of outwardly facing, posterior myophore in the right valve. In addition, a single specimen from Ladakh, which was previously assigned to Polyconites? sp., on account of a similar myophoral distinction from H. haydeni, is transferred to the new genus. Shajia is considered most likely to have been derived from one of a group of Horiopleura species that lived on the southern margin of the Mediterranean Tethys. The so-called 'Yasin fauna' represented by the late Aptian to Albian Horiopleura haydeni/Auroradiolites gilgitensis rudist association, is considered to be restricted to southwestern Asia, including Afghanistan, Kohistan in northern Pakistan and Ladakh in northern India, though those two species in particular have not so far been recorded from the Lhasa Block of Tibet. Nevertheless, S. tibetica co-occurs with Auroradiolites biconvexus (Yang et al.), which probably evolved directly from A. gilgitensis (Douville), and the age of the latter association is in accordance with the generally accepted age of the Yasin fauna as late Aptian to Albian. Hence the S. tibetica and A. biconvexus association can be considered a regional variant of the Yasin fauna, which had evidently already dispersed to the Lhasa Block by the late Aptian. So the Langshan Formation can be considered palaeogeographically linked with other mid-Cretaceous shallow-marine carbonate deposits in adjacent southwestern Asian regions. These findings also provide new evidence that the age of the rudist assemblage of the Lhasa Block is late Aptian to Albian, although a slightly younger age cannot be excluded. (C) 2019 Elsevier Ltd. All rights reserved.
WOS关键词SHYOK SUTURE ZONE ; YASIN-TYPE RUDIST ; LADAKH ARC ; TECTONIC EVOLUTION ; RADIOLITID RUDIST ; NORTHERN LADAKH ; HIPPURITIDA ; CHINA ; COLLISION ; INDIA
资助项目National Natural Science Foundation of China[41702014] ; National Natural Science Foundation of China[41730317] ; National Natural Science Foundation of China[41302011] ; State Key Laboratory of Palaeobiology and Stratigraphy[20162110] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB26000000] ; China Geological Survey[DD20160015] ; UNESCO IUGS IGCP (United Nations Educational, Scientific and Cultural Organization International Union of Geological Sciences)[632]
WOS研究方向Geology ; Paleontology
语种英语
WOS记录号WOS:000504515900004
出版者ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy ; Strategic Priority Research Program of the Chinese Academy of Sciences ; China Geological Survey ; UNESCO IUGS IGCP (United Nations Educational, Scientific and Cultural Organization International Union of Geological Sciences)
源URL[http://ir.nigpas.ac.cn/handle/332004/29748]  
专题中国科学院南京地质古生物研究所
通讯作者Rao, Xin; Skelton, Peter W.; Rao, Xin （饶馨）
作者单位1.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Dept Invertebrate Palaeontol, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
4.Open Univ, Sch Environm Earth & Ecosyst Sci, Milton Keynes MK7 6AA, Bucks, England
5.Univ Toyama, Grad Sch Sci & Engn Res, Dept Earth Syst Sci, 3190 Gofuku, Toyama, Toyama 9308555, Japan
6.Chinese Acad Sci, CAS Key Lab Econ Stratig & Palaeogeog, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Jiangsu, Peoples R China
7.China Geol Survey, Nanjing Ctr, Nanjing 210016, Jiangsu, Peoples R China
8.Sichuan Geol Survey, 25 North Renmin Rd, Chengdu 610084, Sichuan, Peoples R China
推荐引用方式
GB/T 7714		 Rao, Xin,Skelton, Peter W.,Sano, Shin-ichi,et al. Shajia, a new genus of polyconitid rudist from the Langshan Formation of the Lhasa block, Tibet, and its palaeogeographical implications[J]. CRETACEOUS RESEARCH,2020,105:13.
APA Rao, Xin.,Skelton, Peter W..,Sano, Shin-ichi.,Zhang, Yiqiang.,Zhang, Yichun.,...&Rao, Xin .(2020).Shajia, a new genus of polyconitid rudist from the Langshan Formation of the Lhasa block, Tibet, and its palaeogeographical implications.CRETACEOUS RESEARCH,105,13.
MLA Rao, Xin,et al."Shajia, a new genus of polyconitid rudist from the Langshan Formation of the Lhasa block, Tibet, and its palaeogeographical implications".CRETACEOUS RESEARCH 105(2020):13.

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