新疆卡克地区上石炭统别根他乌组沉积相分析

发布时间：2018-10-07 18:08

【摘要】：本文系统研究了新疆卡克地区上石炭统别根他乌组的沉积相,取得如下主要成果和认识:1、别根他乌组碳酸盐岩划分为9种主要岩石类型:微晶灰岩、含生物碎屑微晶灰岩、生物碎屑微晶灰岩、含生物碎屑亮晶似球粒灰岩、亮晶生物碎屑灰岩、生物碎屑砾屑灰岩、砂质砾屑灰岩、含生物碎屑砂质灰岩和砂质亮晶灰岩。2、陆源碎屑岩划分为10种主要岩石类型:砾岩、含砾钙质砂岩、钙质粗砂岩、石英中砂岩、钙质中砂岩、石英细砂岩、钙质细砂岩、钙质粉砂岩、泥质粉砂岩和钙质泥岩。3、将别根他乌组中划分为5种岩性组合。岩性组合1-1:下部单元以薄层钙质砂岩或薄层砂质灰岩为主,上部单元以钙质泥岩为主;岩性组合1-2:下部单元以灰黑色砂质砾屑灰岩为主,上部单元以灰白色中层粉-中砂质亮晶灰岩为主;岩性组合2-1:下部单元以含生物碎屑亮晶似球粒灰岩为主,上部单元以石英砂岩为主;岩性组合2-2:下部单元以钙质泥岩为主,上部单元以灰黑色薄层生物碎屑微晶灰岩或含生物碎屑亮晶似球粒灰岩为主;岩性组合3-1:下部单元以泥灰岩为主,上部单元以灰黑色薄层生物碎屑微晶灰岩为主。4、在别根他乌组中识别出4个沉积相,即:障壁海岸、开阔台地、台地边缘和台缘斜坡;6个亚相,即:潮坪、潮道、泻湖、台缘浅滩、上斜坡和下斜坡;及11个微相。5、建立了研究区别根他乌组沉积相模式:障壁海岸模式和台地-缓斜坡模式。
[Abstract]:In this paper, the sedimentary facies of the Upper Carboniferous Beitawu formation in Kak area, Xinjiang, have been systematically studied. The main achievements and understandings are as follows: 1. The carbonate rocks of the Begentawu formation are divided into 9 main rock types: microcrystalline limestone, bioclastic microcrystalline limestone, and bioclastic microcrystalline limestone. Bioclastic microcrystalline limestone, containing bioclastic bright grained like globular limestone, sparkling bioclastic limestone, bioclastic gravelly limestone, sandy gravelly limestone, There are 10 main rock types of continental clastic rocks: conglomerate, calcareous sandstone, calcareous coarse sandstone, quartz sandstone, calcareous sandstone, quartz fine sandstone, calcareous sandstone. Calcareous siltstone, argillaceous siltstone and calcareous mudstone. Lithologic assemblage 1-1: the lower unit is mainly composed of thin calcareous sandstone or thin layer sandy limestone, the upper unit is mainly calcareous mudstone, and the lower unit is mainly composed of gray and black sandy gravel limestone, and the upper unit is mainly composed of calcareous mudstone and calcareous mudstone. The upper unit is mainly grayish-white silt-medium sandy lime-rock, the lithologic assemblage is 2-1: the lower unit is bioclastic bright crystalline spherulite, the upper unit is quartz sandstone, and the lithologic combination 2-2: the lower unit is calcareous mudstone. The upper unit is mainly composed of gray-black thin layer bioclastic microcrystalline limestone or bioclastic bright crystal globular limestone, and the lithologic assemblage is 3-1: the lower unit is mainly marl. The upper unit is dominated by gray-black thin layer bioclastic microcrystalline limestone. Four sedimentary facies have been identified in the Begentawu formation, namely, barrier coast, open platform, platform edge and platform margin slope, and 6 subfacies, namely, tidal flat, tidal channel, lagoon, etc. The sedimentary facies models of the Guintaowu formation, including barrier coast model and platform gentle slope model, have been established for the study of platform shoal, upper slope and lower slope, and 11 microfacies. 5.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P512.2;P534.45

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