| 碎屑重矿物分析对库车坳陷白垩—第三纪物源变化的指示 |
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| 引用本文： | 李双建,石永红,王清晨.碎屑重矿物分析对库车坳陷白垩—第三纪物源变化的指示[J].沉积学报,2006,24(1):28-35. |
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| 作者姓名： | 李双建 石永红 王清晨 |
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| 作者单位： | 中国科学院地质与地球物理研究所 北京 100029 |
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| 基金项目： | 国家重点基础研究发展规划(973)项目G1999043303资助 |
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| 摘 要： | 碎屑沉积是山脉隆升和盆地沉积的直接记录，包括碎屑重矿物研究在内的碎屑沉积物的分析是开展盆山耦合研究的必要手段。对库车坳陷白垩系—第三系砂岩中重矿物含量特征进行了系统的研究，并应用电子探针技术分析碎屑石榴石和钛铁矿的化学组成，研究表明库车坳陷白垩—第三系源区主要由沉积岩、变质岩和酸性火山岩组成。白垩系砂岩中的石榴石来自西南天山蓝片岩和低级变质岩的比例较大，而第三系砂岩中的石榴石中富铁铝榴石组分，多来自高级变质岩。白垩系砂岩中的钛铁矿多来自变质岩，上第三系砂岩中来自火成岩的钛铁矿比例增加。由此可以认为南天山的大规模隆升和剥蚀发生在第三纪以来，由于它的隆升遮挡了南天山北缘古生代增生杂岩体对库车坳陷的物质贡献，并且随着剥蚀的加深，高级变质岩和火成岩的出露越来越多。
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| 关 键 词： | 重矿物 库车坳陷 南天山 物源 电子探针 石榴石 钛铁矿 |
| 文章编号： | 1000-0550（2006）01-0028-08 |
| 收稿时间： | 2005-03-07 |
| 修稿时间： | 2005-07-10 |
The Analysis of Detrital Heavy Minerals in Cretaceous-Tertiary Sandstones, Kuqa Depression and Their Implications for Provenance |
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| LI Shuang-jian,SHI Yong-hong,WANG Qing-chen.The Analysis of Detrital Heavy Minerals in Cretaceous-Tertiary Sandstones, Kuqa Depression and Their Implications for Provenance[J].Acta Sedimentologica Sinica,2006,24(1):28-35. |
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| Authors: | LI Shuang-jian SHI Yong-hong WANG Qing-chen |
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| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Detrital sedimentation is the direct record in basin for mountain uplift and erosion.The analysis of detrital minerals,including heavy minerals,is a key means for basin-mountain coupling studies.The distribution characteristics of heavy minerals in Cretaceous-Tertiary sandstones,Kuqa depression have been studied systemically in this paper,and chemical compositions of detrital garnets and ilmenites have been analyzed by electronic microprobe. The results illustrate that the provenance area of Cretaceous-Tertiarysandstones,Kuqa depression,are mainly composed of sedimentary rocks,metamorphic rocks and little intermediate-felsic igneous rocks.Thegarnets in Cretaceous sandstones come from blueschist thatlocated in the southwestTianshan and low-grade metamorphic rocks by lager proportionally.The garnets in Tertiary sandstones enrich almandine,which come from high-grade metamorphic rocks.The provenance of most ilmenites in Cretaceous sandstones is metamorphic rocks,and the proportion of igneous rocks provenance increase in Tertiary.These analysis show that southern Tianshan uplift and erosion extensively from Tertiary,as a result of which the provenance of blue schistin Paleozoic accretion from north margin of southTianshan has been curtained. Withdeeply erosion of Tianshan,more and more high-grade metamorphic and igneous rocks are exposed. |
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| Keywords: | heavy mineral Kuqa depression southern Tianshan provenance electronic microprobe garnet ilmenite |
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