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一定的泥岩地球化学特征对应于特定的源区和构造环境,利用主量元素图解可以进行盆地物源分析。通过对思茅盆地江城勐野井矿区含盐系勐野井组(K2me)及其下伏扒沙河组(K1p)泥、砂岩的主量元素地球化学特征分析,并结合岩石薄片观察结果,表明物源区母岩类型主要为长英质岩石;通过SiO2-K2O/Na2O及K2O/Na2O-SiO2/Al2O3判别图分析,认为源区的构造背景具有类似于被动大陆边缘的特征;成分变异指数ICV、化学蚀变指数CIA表明研究区砂、泥岩物源区经受了较强的化学风化作用。
Certain mudstone geochemical characteristics correspond to specific source areas and tectonic settings, and the analysis of provenance of basins can be done by using the graphic representation of major elements. Based on the analysis of the major elemental geochemical characteristics of the salt-bearing Mengyejing Formation (K2me) and the underlying Paishahe Formation (K1p) mudstone and sandstone in the Mengyejing Mine in the Simao Basin, Simao Basin and the observation results of the rock slices, The parent rocks are mainly felsic rocks. According to the discriminant analysis of SiO2-K2O / Na2O and K2O / Na2O-SiO2 / Al2O3, the tectonic setting of the source area is similar to the passive continental margin. The compositional variation index (ICV) The variable index CIA shows that the sand and mudstone provenance areas in the study area have undergone strong chemical weathering.