广西桂中泥盆系沉积相综合研究

The Comprehensive Research about Sedimentary Facies of Devonian System in Guizhong Guangxi

野外剖面实测和室内岩石学分析显示:桂中坳陷泥盆系是一套以海相碳酸盐岩为主的连续地层,岩性为生物灰岩、泥晶-粉晶灰岩、含泥或泥灰岩、礁灰岩、白云质灰岩和白云岩,仅下泥盆系沉积部分细砂岩、粉砂岩及泥质粉砂岩。我们通过一系列的分析得出:广西桂中泥盆系沉积相有3类,即滨岸碎屑岩相,碳酸盐岩相,陆间海槽相。

Measured field geological sections and the petrographic analysis showed that： Devonian in Guizhong Depression was a set of continuous formation which mostly be consisted of marine carbonate rock, the litholngy compositions were biolithite, micrite-crystal powder limestone, containing mud or marl rock, reef limestone, dolomitic limestone and dolomite, only lower Devonian deposited some fine sandstone, siltstone and argillaceous siltstone. Series analysis shows that： Guangxi Devonian sedimentary facies are in 3 categories, namely coastal clastic facies, carbonate phase, trough between the land phases.