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鄂东石西地区晚古生代煤系地层碎屑物源研究

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为探究鄂尔多斯盆地东缘石西地区石炭-二叠系沉积时期碎屑物源及其构造环境特征,采集研究区晚古生代26块泥岩样品和17块砂岩样品,开展主微量元素、矿物组成和铸体薄片鉴定分析工作.实验结果表明:研究区砂岩碎屑颗粒主要由石英、长石、云母和岩屑组成.岩屑平均含量高于20%,火成岩屑以火山凝灰岩屑和侵入岩屑为主,占岩屑总量的78.9%~87.2%,指示火山碎屑岩-溶岩系为主要物源区;泥岩中陆源碎屑母岩为长英质火成岩,物源区为鄂尔多斯盆地南缘再旋回造山带区,物源碎屑供应与北祁连造山带在二叠纪构造演化有关.
Study on Detrital Provenance in the Late Paleozoic Coal Strata of Shixi Area,Eastern Ordos Basin
In order to explore the fragment provenance and structural environment characteristics of Carboniferous-Permian sedimentary rocks in Shixi area,eastern margin of Ordos Basin,some tests were carried out on the analysis of major and trace elements,mineral composition and casting thin-section of 26 mudstone samples and 17 sandstone samples.The results show that the sandstone clastic particles in the study area is mainly composed of quartz,feldspar,mica and debris.The average content of debris is higher than 20%,igneous rock debris mainly consists of volcanic tuff debris and intrusive rocks debris,accounting for 78.9%~87.2%of total content of debris,which means pyroclastic rock-volcanic lava system is the main provenance area;The parent rock of the Carboniferous-Permian terrigenous clastic in study area is felsic igneous rock,and the provenance area is recycling orogenic in southern margin of the Ordos Basin,where the terrigenous debris suppy is related to the Permian tectonic evolution of North Qilian orogenic belt.

Ordos Basincoal strataprovenancetectonic setting

郭旭、杨晋东、于振锋、赵瑞熙

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山西蓝焰煤层气工程研究有限责任公司,山西晋城 048000

煤与煤层气共采全国重点实验室,山西晋城 048012

鄂尔多斯盆地 煤系地层 物源 构造背景

山西省重点研发计划晋城市重点研发计划华新燃气集团有限公司科技项目

20220208030101020210212HX202203

2024

中国矿山工程
中国有色工程设计研究总院

中国矿山工程

影响因子:0.335
ISSN:1672-609X
年,卷(期):2024.53(2)