| 库车坳陷侏罗系砂岩碎屑组分及物源分析 |
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| 关键词:Kuqa depression Jurassic clastic components provenance |
| 基金项目:国家重点基础研究发展规划项目“中国典型叠合盆地层序地层分析与构造古地理地理再造”(编号:G1999043304) |
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| 摘要: |
| An Analysis of Jurassic Sandstone Fragment Components and Their Provenance in Kuqa Depression |
| Kuqa depression is located in the north of the Tarim basin. Its Jurassic strata comprising six groups are a set of continental coal-bearing sediments, which can be divided into the coal measure strata in the middle and lower part and the detrital sediments in the upper part. The fragment components are mainly quartz, feldspar and debris, together in a few places with a bit of mica and chlorite. The sandstone structures are different and the sorting is mainly of medium level. According to statistical analysis of sandstone fragment components, combined with a study of sedimentary characteristics based on variations of mineral compositions and structures, this paper has discussed the provenance of Kuqa depression in Jurassic. It is considered that the provenance of the lower part of Jurassic strata was mainly from the recycled orogenic belt, and rarely from Triassic forebulge,that the source rock was mainly sedimentary rock, and that the provenance of middle and upper part also mainly came from the recycled orogenic belt, with obvious material supply from forebulge. Besides, early sediments at the edge of the basin experienced current mechanic crush and reconstruction, and hence the quantity of mud boulder sediments increased. These sediments were controlled by two source areas, with source rocks being sedimentary rocks. |
| SHEN Yan-ping,WU Chao-dong,YUE Lai-qun,XIE Xiao-jian.2005.An Analysis of Jurassic Sandstone Fragment Components and Their Provenance in Kuqa Depression[J].Acta Geoscientica Sinica,26(3):235-240. |
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