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
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赵振洋, 李双建, 王根厚
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Discussion on Sedimentary Environments,Origin and Source of Middle Permian Gufeng Formation Bedded Cherts in theNorthern Margin of the Middle-Lower Yangtze Area
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Zhenyang Zhao, Shuangjian Li, Genhou Wang
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图4 硅质岩硅质来源判别图解
(a) Al2O3与∑REE交汇图[8]；(b) Al2O3与TiO2交汇图[63]；(c) SiO2与Al2O3交汇图[63]；(d) SiO2与TiO2交汇图[64]
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Fig.4 Diagrams to identify the origin of cherts
(a) Plots show correlations between Al2O3and ∑REE[8];(b) Plots show correlations between TiO2and Al2O3[63]; (c),(d) Plots show correlations between Al2O3, TiO2and SiO2contents of bedded cherts[63,64]
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