广西来宾蓬莱滩剖面中上二叠统硅质岩的地球化学特征及沉积背景.pdf

1000-0569 / 2011/027 (10)-314 1-55 Acta Petrologica Sinica 岩石学报 广西来宾蓬莱滩剖面中上二叠统硅质岩的地球化学 * 特征及沉积背景 1，2 1 3 邱振 王清晨 严德天 QIU Zhen1，2 ，WANG QingChen1 and YAN DeTian3 1. ， 100029 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室 北京 2. ， 100049 中国科学院研究生院 北京 3. ， 430074 中国地质大学构造与油气资源教育部重点实验室 武汉 1. State Key Laboratory of Lithosp heric Evolution ，Institute of Geology and Geop hysics ，Chinese Academy of Sciences ，Beij ing 100029 ，China 2. Graduate University of Chinese Academy of Sciences ，Beij ing 100049 ，China 3. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education ，University of Geosciences ，Wuhan 430074 ，China 20 11-07 -11 收稿，20 11-09-15 改回. Qiu Z ，Wang QC and Yan DT. 2011. Geochemistry and sedimentary background of the Middle-Upper Permian cherts in the Penglaitan section ，Laibin ，Guangxi Province. Acta Petrologica Sinica ，27 (10):3141 － 3155 Abstract The Middle-Upper Permian cherts occur extensively in Laibin area ，Guangxi Province ，in which the Penglaitan section and the Tieqiao section well expose them. In this study ，28 bedded chert samples (3 samples from the Maokou Formation of the Middle Permian and 25 samples from the Heshan Formation of the Upper Permian)were analyzed for major and rare earth elements. Based on the results of major and rare earth element contents of these samples and lithofacies characteristics of them ，we considered that bedded cherts from the Heshan Formation in the Penglaitan section deposited in marginal sea basin environment influenced by terrigenous materials and silica of them derived from siliceous organism as biogenic origin ，whereas ，those from the Maokou Formation deposited in marginal sea basin environment without influence of terrigenous materials and silica of the