Griesbachian Cyclostratigraphy at MajiashanSection, Anhui Province, China

作     者：Peng Yuanqiao Tong Jinnan Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074 Gao Yongqun China University of Geosciences Press, Wuhan 430074 

作者机构：Faculty of Earth Sciences China University of Geosciences China University of Geosciences Press 

出 版 物：《Journal of China University of Geosciences》 (中国地质大学学报（英文版）)

年 卷 期：2001年第12卷第1期

页      面：22-26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：the National Natural Science Founda-tion of China (No. 49632070) 

主　　题：Majiashan Section Griesbachian sedimentary bundles geochemical characters Milankovitch cycles. 

摘      要：The Lower Triassic at Majiashan Section, deposited in the deep part of the Lower Yangtze carbonate ramp, is the only outcrop of the deep Lower Triassic preserved in the present Lower Yangtze region. Even so, the alternations of mudrock of mudrock and marl (or limestone) are still very distinct and recognizableable, though usually more or less condensed. The lithological and geochemical cycles at Majiashan Section are discussed in terms of the sedimentary characters and the contents of some elements analyzed at a 2-centimeter-interval with no hiatus of the Lower Triassic. The division resolution of the Griesbachian stratigraphy may increase to the scale of ten thousand years by the mudrock-marl (or limestone) bundles and the geochemical cycles. The analysis of the relationship between the sedimentary cycles/the geochemical cycles and the Milankovitch cycles may suggest the time limit and the sedimentary rates.