中下扬子北缘中二叠统孤峰组层状硅质岩沉积环境、成因及硅质来源探讨

赵振洋, 李双建, 王根厚

Discussion on Sedimentary Environments,Origin and Source of Middle Permian Gufeng Formation Bedded Cherts in theNorthern Margin of the Middle-Lower Yangtze Area

Zhenyang Zhao, Shuangjian Li, Genhou Wang

表4 硅质岩成因元素判别指标[2,5,59,60,61]

Table 4 Chemical criteria to identify the origin of cherts[2,5,59,60,61]

判别指标 硅质岩成因 热液成因 非热液成因 Al/(Al+Fe+Mn) 0.01 >0.60 LaN/YbN <1 ≈1 LREE/HREE <1 >1 δEu >1 <1