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

图2 硅质岩沉积环境判别图解
(a)Fe₂O₃/TiO₂—Al₂O₃/(Al₂O₃+Fe₂O₃)图解；(b)La_N/Ce_N—Al₂O₃/(Al₂O₃+Fe₂O₃)图解(洋中脊、远洋盆地和大陆边缘分区界线据参考文献[5]修改)

Fig. 2 Diagrams to Identify the Sedimentary environments of Cherts
(a)Fe₂O₃/TiO₂—Al₂O₃/(Al₂O₃+Fe₂O₃) and (b) La_N/Ce_N—Al₂O₃/(Al₂O₃+Fe₂O₃) (ridge, pelagic and continental margin curves modified after reference [5])