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地质论评  2012 

再论安徽沿江地区中二叠统栖霞组砾屑灰岩的成因

Keywords: 砾屑灰岩,栖霞组,二叠系,安徽沿江地区

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Abstract:

安徽沿江地区中二叠统栖霞组地层厚度大,有机质含量高,保存条件良好,其广泛发育的砾屑灰岩也是人们重点关注的对象。但对砾屑灰岩的成因一直存在不同的观点,这对下扬子地区二叠纪古地理恢复及油气勘探等无疑是一种制约。因此,确定栖霞组砾屑灰岩的成因及沉积相意义重大。根据砾石的颜色、含量、产出形态、粒径和圆度等,本文将栖霞组砾屑灰岩分出四种不同类型。综合国际上对砾屑灰岩的成因认识及前人对本区的研究成果,并结合本文研究,对栖霞组砾屑灰岩的成因进行深入讨论。讨论结果显示,砾屑灰岩应为斜坡沉积产物。另外,由于斜坡坡度的差异,分别发育不同的砾石形态、砾石与基质的组合及岩相特征。栖霞组砾屑灰岩的斜坡相沉积可以进一步分为斜坡上部、斜坡中部和斜坡下部。

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