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内蒙古西乌珠穆沁旗晚石炭世-早二叠世阿木山组上段主要为发育在碳酸盐岩台地边缘内的一套深灰色-灰色的块状生物碎屑碳酸盐岩。根据微相组分、微相类型和沉积环境总结出8种碳酸盐岩微相类型,分别为叶状藻粒泥灰岩-泥粒灰岩、含鲕粒团块颗粒灰岩、含少量生物碎屑的泥状灰岩、球粒生屑泥粒灰岩、Antheria polygonalis珊瑚格架灰岩或障积岩、生物碎屑亮晶颗粒灰岩、含核形石颗粒灰岩和生物碎屑泥粒灰岩。微相的垂向叠覆指示了7种沉积相带,为叶状藻礁丘相、台地边缘鲕粒滩相、较深水的开阔台地相、较浅水的斜坡相、珊瑚礁相、台内浅滩相、较浅水的开阔台地相。进一步总结出在开阔台地和台地边缘过渡带上的局部相模式;总体上为潮下开阔台地环境。
The Upper Carboniferous-Early Permian Amunshan Formation in the West Wujumuqin Banner of the Inner Mongolia Autonomous Region is mainly composed of dark gray-gray massive bioclastic carbonate rocks developed within the margin of the carbonate platform. According to the microfacies composition, microfacies type and sedimentary environment, eight types of carbonate microfacies are summarized, which are phyllite-marl limestone, oolitic granulite limestone, Bioclastic muddy limestone, pelvic bioclastic limestone, Antheria polygonalis coral-shelled limestone or banded rock, bioclastic luminescent grain limestone, calcitic limestone-bearing limestone and bioclastic Mudstone. The vertical overlaps of the microfacies indicate seven sedimentary facies belts, which are phylloid algae reefs, oolitic beach facies at platform margin, open platform facies in deeper water, shallow slope facies, coral reef facies, intraplate foreshore facies , Shallow water open platform phase. It further summarizes the local facies patterns on the transitional platform between the open platform and the margin of the platform. In general, it is an open platform environment under the tide.