鄂尔多斯盆地马家沟组中组合马五5亚段白云岩特征及成因机理OA北大核心CSCDCSTPCD
Characteristics and Genesis of Ordovician Majiagou Submember-55 Dolostone in Middle Assemblage, Ordos Basin
通过对鄂尔多斯盆地马家沟组五段5亚段白云岩的岩石学和地球化学研究表明,主要岩性有泥晶白云岩、泥粉晶白云岩和粉晶白云岩等三类。泥晶白云岩类为泥晶结构,阴极发光为暗红光,白云石有序度低；Na、K和Sr值较高；δ13C平均-1.23‰,δ18O平均-7.59‰,锶同位素平均值0.70981,形成于闭塞局限、盐度相对较高的环境,由准同生白云石化作用所形成,并发育少量晶间微孔。泥粉晶白云岩类为泥晶-细粉晶结构,不发光或发极暗的红光,白云石有序度0.75；常…查看全部>>
Based on petrological and geochemical analysis for core samples from the Middle Ordovician Majiagou submember-55 dolostones in Ordos basin, three main types of dolostones are recognized, including micritic dolostone, siltcrystal micritic dolostone and siltcrystal dolostone. The characteristics of them are described as follows:(a) The micritic dolostone is formed in euxinic-restricted and high-salinity environment by penecontemporaneous dolomitization, in whi…查看全部>>
张庄;杨西燕;董兆雄
成都理工大学能源学院成都理工大学沉积地质研究院 西南石油大学地球科学与技术学院
能源科技
白云岩地球化学白云石化作用马家沟组鄂尔多斯盆地
Middle OrdovicianMajiagou Fm.DolostoneGeochemistryDolomitizationOrdos Basin
《海相油气地质》 2016 (2)
65-71,7
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