现代地质2017，Vol.31Issue(4)：734-745,12.
安徽省巢湖地区二叠纪栖霞组、孤峰组硅质岩地球化学特征对比及大地构造背景分析
Geochemical Characteristics Comparison and Tectonic Background Analysis of Siliceous Rocks from Qixia Formation and Gufeng Formation of Permian in Chaohu Area, Anhui Province
摘要
Abstract
Aiming to discuss the origin and sedimentary background of Permian chert in Yangtze region,we took the siliceous rocks as samples from Qixia Formation and Gufeng Formation in Chaohu area,which located in the northern margin of the Yangtze block.In this study,we collected previous research data of these two formations and systematically analyzed major,trace and rare elements data of siliceous rocks collected from the two formations.Test results of samples which we got in this study show that rare earth elements (REEs) pattern curves lean slightly to the left,with slight Ce negative anomaly and HREE relative enrichment,reflects the characteristics of the hydrothermal chert.The points pitched on the A1-Fe-Mn diagram of Qixia Formation and Gufeng Formation siliceous rocks indicate that most of the samples are high in A1.In this paper,we proposed that magma suffered the contamination of the Si-A1 rich continental crust during the eruption,with high A1 ratio.Combined with diagrams of sedimentary environments we came to a conclusion that cherts in Qixia Formation and Gufeng Formation were deposited at continental margin,continental margin-ocean basin,respectively.From Qixia Period to Gufeng Period,transgression scale became large,the depth of seawater became large,the area of oceanbasin expanded,which made sedimentary environment different.The siliceous rocks sedimentation in both Qixia Formation and Gufeng Formation was closely related to continental margin chasmic activities.关键词
硅质岩/海盆/大陆边缘/热水沉积/巢湖地区Key words
siliceous rock/ocean basin/continental margin/hydrothermal sedimentation/Chaohu area分类
天文与地球科学引用本文复制引用
加娜提古丽·吾斯曼,周瑶琪,姚旭,许汉华,方雪..安徽省巢湖地区二叠纪栖霞组、孤峰组硅质岩地球化学特征对比及大地构造背景分析[J].现代地质,2017,31(4):734-745,12.基金项目
国家自然科学基金项目(41272123) （41272123）
中央高校基本科研业务费专项资金项目(13CX06016A). （13CX06016A）
