Geochemistry and Sedimentary Background of the Middle-Upper Permian Cherts in the Penglaitan Section, Laibin, Guangxi Province

详细信息   

• 责任者：Qiu Zhen (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Wang Qingchen
• 刊名：Acta Petrologica Sinica
• 出版年：2011
• 卷期：27(10)
• 关键词：硅质岩 ; silicolite ; 广西 ; Guangxi Province
• 页码：p.3141-3155
• 图表：8 illus., 2 tables, 62 refs.
• 分类号：0803
• 出版序号：306
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

摘要

In this paper, 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. The authors 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 them primarily derived from hydrothermal fluid as hydrothermal origin. Comparing sedimentary background of bedded cherts in the Penglaitan section with those as hydrothermal origin in the Tieqiao section, this study showed that Laibin area developed a marginal sea basin environment rich in silica during the Middle-Late Permian and discrepancy in influence of terrigenous materials controlled the different origin of bedded cherts in Laibin area.