An Early Paleozoic Tectonic Mélange at the Western Margin of West Cathaysia: Constraints from Organic-walled Microfossils  

作　　者：WANG Lijun ZHANG Kexin HE Weihong YIN Leiming Shoufa LIN 

机构地区：[1]State Key Laboratory of Biogeology and Environmental Geology,School of Earth Sciences,China University of Geosciences,Wuhan 430074,China [2]Department of Earth and Environmental Sciences,University of Waterloo,Waterloo,Ontario N2L 3G1,Canada [3]Institute of Geological Survey,China University of Geosciences,Wuhan 430074,China [4]Nanjing Institute of Geology and Paleontology,Chinese Academy of Sciences,Nanjing 210008,China

出　　处：《Acta Geologica Sinica(English Edition)》2020年第4期1060-1070,共11页地质学报（英文版）

基　　金：funded by the National Natural Science Foundation(No.41772107 and No.41472166);the Geological Survey Program(No.DD20190370 and No.DD20190811)of the People’s Republic of China;the 13th Five-year Plan of the Ministry of Science and Technology of China(2016ZX05034-002-003);the Natural Sciences and Engineering Research Council of Canada。

摘　　要：The Jiangshan-Shaoxing-Pingxiang Fault(JSP Fault) is traditionally considered as the boundary between the Yangtze and Cathaysia blocks in South China. Whether the previously defined Shenshan and Kuli formations located along the JSP fault and near the Xinyu City, Jiangxi Province, are continuous strata or parts of a tectonic mélange is important for understanding the geological history of South China. A carbonaceous phyllite from the area, previously considered as part of the Neoproterozoic Shenshan and Kuli formations, is analyzed palynologically in this study. The AsteridiumComasphaeridium acritarch assemblage found in the slate can be correlated with the basal Cambrian AsteridiumHeliosphaeridium-Comasphaeridium(AHC) acritarch assemblage in Tarim and the Yangtze Block. The early Cambrian biostratigraphical age assignment for the carbonaceous phyllite indicates the presence of both Neoproterozoic and Cambrian rocks in the sedimentary package, and supports that the package is a part of tectonic mélange rather than a continuous Neoproterozoic strata. The Cambrian slate is the youngest known lithology in the mélange at present.

关 键 词：ACRITARCH Shenshan and Kuli formations Shenshan tectonic mélange West Cathaysia 

分 类 号：P542[天文地球—构造地质学] P534.4[天文地球—地质学] Q911.2[生物学—古生物学]