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Microfacies analysis of the Lower-Middle Ordovician succession at Xiangshuidong, southwestern Hubei Province, and the drowning and shelf-ramp transition of a carbonate platform in the Yangtze region
Luan, Xiaocong (栾晓聪)1,2; Brett, Carlton E.3; Zhan, Renbin (詹仁斌)1,2; Liu, Jianbo4; Wu, Rongchang (吴荣昌)1; Liang, Yan (梁艳)1
2017-11-01
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume485Pages:68-83
Abstract

During the Early-Middle Ordovician, the Yangtze Platform in South China was drowned, as indicated by the replacement of pure grey grainstones and packstones of the Hunghuayuan Formation by purple red, argillaceous limestone of the Zitai Formation and correlative units, which are mixed siliciclastic and carbonate deposits. The Xiangshuidong Section, located in Songzi City, southwestern Hubei Province, was selected to study the process in detail. Cluster analysis of point-count groups of the Hunghuayuan and the Zitai formations, indicates that the former contains six microfacies: MF-1 peloidal grainstone, MF-2 thrombolitic grainstone, MF-3 oolitic grainstone, MF-4 bioclastic grainstone, MF-5 lithoclastic grainstone, MF-6 interreef bioclastic grain-packstone, indicating a shelf setting before drowning, while the latter contains seven microfacies: MF-7 bioclastic grainstone, MF-8 bioclastic grain-to packstone, MF-9 bioclastic packstone, MF-10 bioclastic wackestone, MF-11 argillaceous bioclastic wackestone, MF-12 open-marine bioclastic wackestone, MF-13 calcimudstone, indicating the ramp setting during and after the drowning. The drowning was gradual and fluctuating, starting as a marginal shoal, through the inner ramp, and becoming a stable ramp setting. This drowning is mainly attributed to a global sea-level rise, and an increase of terrigenous supply that resulted from local tectonic movement (i.e. the initiation of collision between the South China and Cathaysia blocks). After drowning, red offshore marine fades were well developed along the platform margin, indicating an oxic sea bottom environment during the first acme of GOBE in South China. The changes in environments associated with this transition may have provided new evolutionary opportunities that contributed to the Middle Ordovician diversification. (C) 2017 Elsevier B.V. All rights reserved.

KeywordCluster Analysis South China Marine Red Bed Gobe
DOI10.1016/j.palaeo.2017.06.004
Indexed BySCI
Language英语
WOS KeywordBiodiversification Event Gobe ; South China ; Warm-temperate ; North China ; Basin ; Reefs ; Microtaphofacies ; Sea ; Unconformities ; Sedimentary
Funding ProjectNational Natural Science Foundation of China (NSFC)[41521061] ; National Natural Science Foundation of China (NSFC)[41290260] ; National Natural Science Foundation of China (NSFC)[41672008] ; National Natural Science Foundation of China (NSFC)[J1210006] ; IGCP Project: the Onset of the Great Ordovician Biodiversification Event (GOBE)[653]
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000419747400006
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; IGCP Project: the Onset of the Great Ordovician Biodiversification Event (GOBE)
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/14085
Collection中国科学院南京地质古生物研究所
中国科学院南京地质古生物研究所
其他
Corresponding AuthorLuan, Xiaocong (栾晓聪)
Affiliation1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA
4.Peking Univ, Sch Earth & Space Sci, Paleontol & Stratig, Beijing 100871, Peoples R China
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Luan, Xiaocong ,Brett, Carlton E.,Zhan, Renbin ,et al. Microfacies analysis of the Lower-Middle Ordovician succession at Xiangshuidong, southwestern Hubei Province, and the drowning and shelf-ramp transition of a carbonate platform in the Yangtze region[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2017,485:68-83.
APA Luan, Xiaocong ,Brett, Carlton E.,Zhan, Renbin ,Liu, Jianbo,Wu, Rongchang ,&Liang, Yan .(2017).Microfacies analysis of the Lower-Middle Ordovician succession at Xiangshuidong, southwestern Hubei Province, and the drowning and shelf-ramp transition of a carbonate platform in the Yangtze region.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,485,68-83.
MLA Luan, Xiaocong ,et al."Microfacies analysis of the Lower-Middle Ordovician succession at Xiangshuidong, southwestern Hubei Province, and the drowning and shelf-ramp transition of a carbonate platform in the Yangtze region".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 485(2017):68-83.
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