| 鄂尔多斯盆地西缘石槽村地区直罗组砂岩地球化学特征和碎屑锆石U-Pb年代学特征:对构造背景及物源的启示 |
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| 引用本文： | 俞礽安,司庆红,王善博,朱强,刘晓雪,王海波,唐永香. 鄂尔多斯盆地西缘石槽村地区直罗组砂岩地球化学特征和碎屑锆石U-Pb年代学特征:对构造背景及物源的启示[J]. 大地构造与成矿学, 2020, 0(4): 754-771 |
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| 作者姓名： | 俞礽安 司庆红 王善博 朱强 刘晓雪 王海波 唐永香 |
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| 作者单位： | 中国地质调查局天津地质调查中心;中国地质调查局铀矿地质重点实验室;宁夏回族自治区核工业地质勘查院;天津地热勘查开发设计院 |
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| 基金项目： | 中国地质调查局地质调查项目(DD20190119);国家重点研发计划“深地资源勘查开采”重点专项项目(2018YFC0604200)联合资助。 |
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| 摘 要： | 石槽村矿区位于鄂尔多斯盆地西缘宁东地区,为近几年鄂尔多斯盆地西缘新发现的中型铀矿。本文选取矿区中侏罗统直罗组砂岩进行岩石地球化学及碎屑锆石U-Pb年代学研究,限定其物质来源,探讨其沉积构造背景。石槽村矿区直罗组下段源区岩石类型主要为长英质沉积岩,源岩构造背景为大陆边缘弧环境。综合岩石的微量和稀土元素特征以及碎屑锆石U-Pb年龄,认为研究区直罗组物源主要来自华北板块西部的孔兹岩、TTG片麻岩、麻粒岩和镁铁质-超镁铁质层状侵入岩以及阿拉善地块海西期岩浆岩。研究区直罗组的碎屑锆石U-Pb年龄分布特征与相邻瓷窑堡地区中侏罗统延安组差别较大,结合直罗组的沉积体系特征,说明鄂尔多斯盆地西缘在延安组-直罗组沉积期,发生了较大构造运动,使得物源的方向和成分发生了较大变化,随时间推移物源除盆地西缘阿拉善地块的贡献之外,也来自北部造山带。
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| 关 键 词： | 中侏罗统直罗组 砂岩 碎屑锆石U-Pb年龄 构造背景 物源 鄂尔多斯盆地西缘 石槽村 |
Geochemical Characteristics and Detrital Zircon U-Pb Ages of the Zhiluo Formation in the Shicaocun Area of the Western Ordos Basin and Implication for its Tectonic Setting and Provenance |
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| YU Reng’an,SI Qinghong,WANG Shanbo,ZHU Qiang,LIU Xiaoxue,WANG Haibo,TANG Yongxiang. Geochemical Characteristics and Detrital Zircon U-Pb Ages of the Zhiluo Formation in the Shicaocun Area of the Western Ordos Basin and Implication for its Tectonic Setting and Provenance[J]. Geotectonica et Metallogenia, 2020, 0(4): 754-771 |
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| Authors: | YU Reng’an SI Qinghong WANG Shanbo ZHU Qiang LIU Xiaoxue WANG Haibo TANG Yongxiang |
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| Affiliation: | (Tianjin Center,China Geological Survey,Tianjin 300170,China;Key Laboratory of Uranium Geology,China Geological Survey,Tianjin 300170,China;Ningxia Hui Autonomous Region Nuclear Industry Geological Exploration Institute,Yinchuan 750021,Ningxia,China;Tianjin Geothermal Exploration Institute,Tianjin 300250,China) |
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| Abstract: | The Shicaocun uranium deposit is located in the Ningdong area of the western Ordos Basin,which is a medium scale uranium deposit discovered recently.Here,we present the geochemical characteristics and zircon U-Pb ages of the Zhiluo Formation sandstone in the Shicaocun area.These data are used to constrain the provenance and tectonic setting of the Zhiluo Formation.The results show that the lower part of the Zhiluo Formation were derived from felsic sedimentary rocks and deposited in a continental margin arc environment.Based on the characteristics of trace elements and the zircon U-Pb dating results,we suggest that the sources of the Zhiluo Formation in the study area are mainly from Konzite,TTG gneiss,granulite and mafic-ultramafic layered intrusive rocks in the western of the North China Craton,and the Hercynian granites in the Alashan Block.The distribution of the detrital zircon ages of the Zhiluo Formation in the study area is different from those of the Yan’an Formation in the adjacent Ciyaobao area.Combining with the characteristics of sedimentary rocks in the Zhiluo Formation,it can be inferred that study the study area underwent strong tectonic movement during the sedimentation of the Yan’an Formation and Zhiluo Formation,and subsequently led to the changes in the direction and composition of the source rocks.The source rocks of the Zhiluo Formation include those from the Alxa Block and the northern orogenic belt as well. |
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| Keywords: | Zhiluo Formation sandstone U-Pb ages of detrital zircons tectonic setting provenance western Ordos Basin Shicaocun area |
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