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Biostratigraphical constraints on the disconformity within the Upper Ordovician in the Baoshan and Mangshi regions, western Yunnan Province, China
Fang, Xiang (方翔)1,2; Ma, Xuan (马譞)1,2; Li, Wenjie1,2; Zhang, Yuandong (张元动)1; Zhou, Zhiqiang (周志强)3; Chen, Tingen (陈廷恩)1; Lu, Yong4; Yu, Shenyang (于深洋)1,2; Fan, Junxuan (樊隽轩)5
2018-04-01
Source PublicationLETHAIA
ISSN0024-1164
Volume51Issue:2Pages:312-323
Abstract

The Ordovician and Silurian of the Baoshan and Mangshi regions in western Yunnan Province, SW China, have long been regarded as being continuous and representative of the Sibumasu terrane. However, our recent biostratigraphical investigations of three Katian to Llandovery sections of predominantly clastic facies reveal a significant, largely correlative disconformity within the Upper Ordovician. These sections include the Laojianshan and Feida Storehouse sections in Baoshan, and the Shaodihe section in Mangshi. In the Baoshan region, the disconformity lies at the base of the overlying Jenhochiao Formation and spans a time interval from earliest late Katian (Dicellograptus complexus Biozone) to early Hirnantian (lower Metabolograptus extraordinarius Biozone), as constrained by the trilobites and brachiopods from the underlying strata and the graptolites from the overlying strata. In the Mangshi region, the disconformity lies at the base of the overlying Wanyaoshu Formation, spanning nearly the entire late Katian (Dicellograptus complexus Biozone to lower Paraorthograptus pacificus Biozone), as constrained by graptolites, trilobites and brachiopods from underlying and overlying beds. A considerably diverse, typical Hirnantia fauna occurs in the Wanyaoshu Formation, which is correlated with the same fauna from the Kuanyinchiao Formation in the Yangtze region, South China, and its equivalents elsewhere. A weathering crust of 10-20cm in thickness occurs ubiquitously in both regions, in association with the disconformity. This stratigraphical gap within the Upper Ordovician in western Yunnan is probably resulted from the abrupt sea-level drop induced by Late Ordovician Glaciations, or alternatively and less likely result from a regional tectonic uplift in northern Sibumasu terrane.

KeywordBiostratigraphy Disconformity Glaciation Hirnantia Fauna Sibumasu Upper Ordovician Western Yunnan
DOI10.1111/let.12255
Language英语
WOS KeywordHirnantian Upper Ordovician ; Fauna Brachiopoda ; South China ; Environmental-changes ; Black Shales ; Stratigraphy ; Glaciation ; Graptolites ; Basin
Funding ProjectChinese Academy of Sciences[XDPB05] ; Chinese Academy of Sciences[XDB10010100] ; National Natural Science Foundation[41521061] ; National Natural Science Foundation[41290260] ; Ministry of Science and Technology[2013FY111000]
WOS Research AreaPaleontology
WOS SubjectPaleontology
WOS IDWOS:000428449700015
Funding OrganizationChinese Academy of Sciences ; National Natural Science Foundation ; Ministry of Science and Technology
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/18904
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorZhang, Yuandong (张元动)
Affiliation1.Chinese Acad Sci, Lab Econ Stratig & Palaeogeog, Nanjing Inst Geol & Palaeontol, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
3.Xian Ctr Geol Survey, 438 East Youyi Rd, Xian 710054, Shaanxi, Peoples R China
4.CGS, Inst Karst Geol, 50 Qixing Rd, Guilin 541004, Peoples R China
5.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Fang, Xiang ,Ma, Xuan ,Li, Wenjie,et al. Biostratigraphical constraints on the disconformity within the Upper Ordovician in the Baoshan and Mangshi regions, western Yunnan Province, China[J]. LETHAIA,2018,51(2):312-323.
APA Fang, Xiang .,Ma, Xuan .,Li, Wenjie.,Zhang, Yuandong .,Zhou, Zhiqiang .,...&Fan, Junxuan .(2018).Biostratigraphical constraints on the disconformity within the Upper Ordovician in the Baoshan and Mangshi regions, western Yunnan Province, China.LETHAIA,51(2),312-323.
MLA Fang, Xiang ,et al."Biostratigraphical constraints on the disconformity within the Upper Ordovician in the Baoshan and Mangshi regions, western Yunnan Province, China".LETHAIA 51.2(2018):312-323.
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