NIGPAS OpenIR  > 中国科学院南京地质古生物研究所
Reconstruction of a shallow intraplatform depression by microfacies analysis of the Upper Ordovician Miaopo and Datianba formations in the northwestern Yangtze Region, China
Song, Yan-Yan (宋妍妍)1,2; Yu, Shen-Yang (于深洋)3,4; Zhang, Yuan-Dong (张元动)3,5; Sun, Xiao-Wen6; Muir, Lucy A.7; Liu, Peng-Ju (刘鹏举)1
2017-12
Source PublicationPALAEOWORLD
ISSN1871-174X
Volume26Issue:4Pages:589-601
Abstract

The sedimentary environments of the Upper Ordovician (lower Sandbian) shale-dominated Miaopo Formation and the contemporaneous limestone-dominated Datianba Formation in the northwestern Yangtze Platform, China, are reconstructed using facies analysis incorporating microfacies and faunal indicators. These two lithological units are generally only a few meters thick but each spans an interval of the Nemagraptus gracilis Biozone (ca. 3-4 My). Accordingly, they are condensed sequences. The Datianba Formation, which consists of thin-bedded limestones containing a shelly fauna, was formed in a shallow, oxic setting on the outer-shelf. The Miaopo Formation shales are limited to depressions surrounded by the Datianba Formation, indicating the sporadic occurrence of anoxic marine environments on the sea floor. The Miaopo Formation contains a high-diversity, abundant benthic fauna in addition to planktonic graptolites. The presence of tube-shaped burrows within the Miaopo Formation further indicates an oxic sea floor favorable for survival of benthic fauna. These results indicate that during deposition of the two formations the sea floor was mainly oxic. During deposition of the Datianba and Miaopo formations, the sea floor was a relatively gentle ramp without steep slopes. The distinct facies of the Miaopo and Datianba formations are interfingered. (C) 2017 Elsevier Ireland Ltd Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. Published by Elsevier B.V. All rights reserved.

KeywordPaleoenvironmental Reconstruction Microfacies Analysis Faunal Indicators Late Ordovician (Early Sandbian) Miaopo Formation Yangtze Region
DOI10.1016/j.palwor.2017.03.003
Indexed BySCI
Language英语
WOS Research AreaPaleontology
WOS SubjectPaleontology
WOS IDWOS:000416080300001
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/22741
Collection中国科学院南京地质古生物研究所
其他
Affiliation1.Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China;
2.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing, Jiangsu, Peoples R China;
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing, Jiangsu, Peoples R China;
4.Univ Chinese Acad Sci, Beijing, Peoples R China;
5.CAS Key Lab Econ Stratig & Palaeogeog, Nanjing, Jiangsu, Peoples R China;
6.Sun Petr Geoserv, Melbourne, Vic 3128, Australia;
7.Amgueddfa Cymru Natl Museum Wales, Dept Nat Sci, Cardiff, S Glam, Wales
Recommended Citation
GB/T 7714
Song, Yan-Yan ,Yu, Shen-Yang ,Zhang, Yuan-Dong ,et al. Reconstruction of a shallow intraplatform depression by microfacies analysis of the Upper Ordovician Miaopo and Datianba formations in the northwestern Yangtze Region, China[J]. PALAEOWORLD,2017,26(4):589-601.
APA Song, Yan-Yan ,Yu, Shen-Yang ,Zhang, Yuan-Dong ,Sun, Xiao-Wen,Muir, Lucy A.,&Liu, Peng-Ju .(2017).Reconstruction of a shallow intraplatform depression by microfacies analysis of the Upper Ordovician Miaopo and Datianba formations in the northwestern Yangtze Region, China.PALAEOWORLD,26(4),589-601.
MLA Song, Yan-Yan ,et al."Reconstruction of a shallow intraplatform depression by microfacies analysis of the Upper Ordovician Miaopo and Datianba formations in the northwestern Yangtze Region, China".PALAEOWORLD 26.4(2017):589-601.
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