Early Paleozoic whole-rock Ce anomalies and secular eustatic changes in the Upper Yangtze region

作     者：冯洪真 B.-D.Erdtmann 王海峰 

作者机构：State Key Laboratory for Research of Mineral Deposits Nanjing University Nanjing 210093 China Institut fur Angewandte Geowissenschaften II Technologische Universitat Berlin 10587 Deutschland Institute of Geology and Paleontology Chinese Academy of Sciences Nanjing 210093 China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2000年第43卷第3期

页      面：328-336页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：Institut für Angewandte Geowissenschaften II Technologische Universität, Berlin, Deutschland National Natural Science Foundation of China, NSFC, (49673182) 

主　　题：whole-rock Ce anomalies eustatic circles geneses of black shales. 

摘      要：The 65 whole-rock REE samples studied come from the classic sections of Early Cambrian to Early Silurian in the Yichang area, Hubei Province. REE concentrations tested on ICP-AES are normalized to the North American Shale Composite (NASC), and Ce anomaly values are calculated based on log[3Cen(2Lan+Ndn)]. With the whole-rock Ce anomaly used as a quantitative index of sea-level changes, 5 prominent eustatic circles are recognized, and a good corresponding relationship is observed between the black shale episodes and the transgressive events. On account of the global distributions of coeval black shales and the specified paleogeographic background of South China, a genetic hypothesis based on the model of O2-minimum zone expansion is suggested for the Early Paleozoic multi-episode black shales in South China.