| 库鲁克塔格早寒武世泥质岩的地球化学特征及其地质意义 |
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| 引用本文： | 刘文,吴春明,吕新彪,杨恩林,王祥东,汪一凡,吴建亮.库鲁克塔格早寒武世泥质岩的地球化学特征及其地质意义[J].中国地质,2016(6):1999-2010. |
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| 作者姓名： | 刘文 吴春明 吕新彪 杨恩林 王祥东 汪一凡 吴建亮 |
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| 作者单位： | 四川省地质调查院, 四川 成都 610081,中国地质大学(武汉)地质调查研究院, 湖北 武汉 430074,中国地质大学(武汉)资源学院, 湖北 武汉 430074,中国地质大学(武汉)资源学院, 湖北 武汉 430074,中国地质大学(武汉)资源学院, 湖北 武汉 430074,中国地质大学(武汉)地质调查研究院, 湖北 武汉 430074,四川省地质调查院, 四川 成都 610081 |
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| 基金项目： | “十二五”国家科技支撑计划“新疆305项目（2011BAB06B04-05）”资助。 |
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| 摘 要： | 通过对且干布拉克地区西山布拉克组泥质岩岩石学、地球化学特征的研究,探讨其物源特征、风化作用以及沉积盆地的构造环境。且干布拉克大坂剖面泥质岩Al_2O_3/TiO_2、Th/Sc、(Gd/Yb)_N、(Eu/Eu*)_N、ICV、CIA均值分别为24、0.9、1.1、0.6、1.2、70,莫合尔山剖面泥质岩Al_2O_3/TiO_2、Th/Sc、(Gd/Yb)_N、(Eu/Eu*)_N、ICV、CIA均值分别为10.5、0.2、3.5、1.01、2.8、75。这些特征表明,研究区泥质岩为第一次沉积的沉积物,源区母岩主要以岩浆岩为主。且干布拉克大坂剖面泥质岩的源区母岩主要以南部的花岗岩等长英质岩浆岩为主,沉积于陆内较稳定的构造环境;莫合尔山剖面泥质岩的源区母岩主要以北部玄武岩等中基性岩浆岩为主,沉积于陆内火山岩隆起的构造环境。在诺丁尼亚超大陆裂解的大构造背景下,早寒武世早期莫合尔山的裂解作用比且干布拉克大坂更为强烈。CIA值表明且干布拉克地区泥质岩物源区母岩经历了中等程度的化学风化作用,沉积物沉积时气候较温暖、湿润,早寒武世早期位于30°S左右的低纬度地区。且干布拉克大坂剖面的含钒炭质硅质页岩、莫合尔山剖面的铁质磷质岩的元素地球化学特征暗示了磷、钒等成矿元素与可能来自于震旦纪和寒武纪的中基性火山岩。
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| 关 键 词： | 泥质岩 岩石学 地球化学 库鲁克塔格 |
| 收稿时间： | 2015/11/2 0:00:00 |
| 修稿时间： | 2016/2/1 0:00:00 |
Geochemical characteristics and geological significance of Early Cambrian argillaceous rocks in Kuruk Tag, Xinjiang |
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| LIU Wen,WU Chun-ming,LV Xin-biao,YANG En-lin,WANG Xiang-dong,WANG Yi-fan and WU Jian-liang.Geochemical characteristics and geological significance of Early Cambrian argillaceous rocks in Kuruk Tag, Xinjiang[J].Chinese Geology,2016(6):1999-2010. |
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| Authors: | LIU Wen WU Chun-ming LV Xin-biao YANG En-lin WANG Xiang-dong WANG Yi-fan and WU Jian-liang |
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| Institution: | Sichuan Geological Survey, Chengdu 610081, Sichuan, China,Institute of Geological Survey, China University of Geosciences, Wuhan 430074, Hubei, China,Faculty of Resource Department, China University of Geosciences, Wuhan 430074, Hubei, China,Faculty of Resource Department, China University of Geosciences, Wuhan 430074, Hubei, China,Faculty of Resource Department, China University of Geosciences, Wuhan 430074, Hubei, China,Institute of Geological Survey, China University of Geosciences, Wuhan 430074, Hubei, China and Sichuan Geological Survey, Chengdu 610081, Sichuan, China |
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| Abstract: | Systematic analysis of petrology and geochemistry of Xishanbulake Formation argillaceous rocks in Tseganbrark was made in this study. The purpose of this paper is to discuss sediment provenance, weathering and tectonic setting of sedimentation basin. The ratios of Al2O3/TiO2, Th/Sc, (Gd/Yb)N,(Eu/Eu*)N, ICV, CIA of argillaceous rocks in Qieganbulakedaban are 24, 0.9, 1.1, 0.6, 1.2, 70 respectively, while these ratios in Moheershan are 10.5, 0.2, 3.5, 1.01, 2.8, 75 respectively. These characteristics indicate that all of argillaceous rocks tended to occur in first-cycle deposit. The source rock of argillaceous rocks in Qieganbulakedaban were granitoids formed in a stable intracontinental environment, whereas the source rock of them in Moheershan were basicintermediate magmatic rocks formed in a volcanic uplift environment. Under the tectonic setting of Rodinia Supercontinent cracking, the cracking of Moheershan was stronger than Qieganbulakedaban. The CIA in the study area demonstrates that the source region of argillaceous rocks suffered from medium degree chemical weathering which reflects a warm and moist climate located in 30°S. The CIA characteristics of vanadium-bearing carbonaceous shales and phosphorite suggest that the sources of vanadium and phosphorus were connected with basic-intermediate magmatism in Sinian and Cambrian. |
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| Keywords: | argillaceous rocks petrology geochemistry Kuruk Tag |
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