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主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

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    柴北缘阿木尼克地区晚古生代牦牛山组火山岩地质地球化学特征及其地质意义

    李建兵, 万世昌, 李镇宏

    李建兵, 万世昌, 李镇宏. 柴北缘阿木尼克地区晚古生代牦牛山组火山岩地质地球化学特征及其地质意义[J]. 西北地质, 2017, 50(3): 47-53.
    引用本文: 李建兵, 万世昌, 李镇宏. 柴北缘阿木尼克地区晚古生代牦牛山组火山岩地质地球化学特征及其地质意义[J]. 西北地质, 2017, 50(3): 47-53.
    LI Jianbing, WAN Shichang, LI Zhenhong. Geological and Geochemistry Characteristics of Volcanics in the Late Paleozoic Maoniushan Formation in Amunike Area of Northern Qaidam Basin[J]. Northwestern Geology, 2017, 50(3): 47-53.
    Citation: LI Jianbing, WAN Shichang, LI Zhenhong. Geological and Geochemistry Characteristics of Volcanics in the Late Paleozoic Maoniushan Formation in Amunike Area of Northern Qaidam Basin[J]. Northwestern Geology, 2017, 50(3): 47-53.

    柴北缘阿木尼克地区晚古生代牦牛山组火山岩地质地球化学特征及其地质意义

    基金项目: 

    中国地质调查局西安地质调查中心"青海省都兰县阿木尼区地区1:5万区域矿产地质调查项目"(12120114018222)

    详细信息
      作者简介:

      李建兵(1973-),四川仁寿人,博士,高级工程师,主要从事区域地质、矿产地质调查研究工作。E-mail:188621638@qq.com

    • 中图分类号: P588

    Geological and Geochemistry Characteristics of Volcanics in the Late Paleozoic Maoniushan Formation in Amunike Area of Northern Qaidam Basin

    • 摘要: 柴北缘阿木尼克山地区晚古生代火山岩赋存于牦牛山组内,岩性以酸性火山岩为主,有少量的中性火山岩,在火山岩层间,夹薄板状(陆源碎屑)白云岩、薄层状钙质泥质粉砂岩等沉积岩。火山岩相包括爆发相、溢流相、爆发沉积相,柱状节理发育,具陆相喷发特征。岩石主量元素、稀土元素、微量元素特征与岛弧火山岩相似,综合宏观岩石组合特征,可以判断牦牛山组火山岩产于板内环境。在该套火山岩夹层中采得中泥盆统标准化石Lepidodendropsis sp.(拟鳞木),在英安岩中获得的锆石206Pb/238U年龄为(369.2±3.3) Ma、(392.4±3.3) Ma,据此可以确定火山岩形成时代为中泥盆世-晚泥盆世,柴北缘阿木尼克山地区牦牛山组火山岩形成的地质时代明显晚于东昆仑地区,由此也说明东昆仑、柴北缘的火山岩浆活动及大构造演化不是同步的。
      Abstract: The volcanics in Amunike area of Northern Qaidam Basin distribute in late Paleozoic Maoniushan Formation.It was composed of large numbers of acidic volcanic rocks and a small amount of intermediate volcanic rocks with some thin-bedded sedimentary rocks mezzanine such as dolomite and calcareous argillaceous siltstone. The volcanic facies can be divided into eruptive facies, effusive facies and volcanic sedimentary facies with Columnar Joint characteristics. Results of major elements shows a feature of S-type granites, while the REE and trace elements both illustrate a similarity with island arc volcanic rocks which formed in intraplate setting. The discovery of Lepidodendropsis sp., finding in the sedimentary rocks mezzanine,was one kind of standard fossils for Middle Devonian, and obtaining of zircon 206Pb/238U isotopic age of (369.2±3.3)Ma、(392.4±3.3)Ma in dacites can define the age of these volcanic rocks are Middle-Late Devonian, that significantly later than the East Kunlun area. We can concluded that magmatic activity and geotectonic evolution between the East Kunlun area and northern margin of Qaidam basin are not synchronized.
    • 张雪亭,杨生德,杨站君,等.青海省地质图(1:1000000)说明书[R].北京:地质出版社,2006.
      张雪亭,杨生德,杨站君,等.青海省大地构造图(1:1000000)说明书[R].北京:地质出版社,2006.
      周春景,胡道功,BAROSH P J,等.东昆仑三道弯流纹英安斑岩锆石U-Pb年龄及其地质意义[J].地质力学报,2010,16(01):28-35.

      ZHOU Chunjing,HU Daogong,Barosh P J, et al. Zircon U-Pb dating of the rhyolite-daciteporphyry in the sandaowan of east kunlunmountains and its geological significance[J]. Journal of Geomechanics,2010,16(01):28-35.

      张耀玲,胡道功,石玉若,等.东昆仑造山带牦牛山组火山岩SHRIMP锆石U-Pb年龄及其构造意义[J].地质通报,2010,29(11):1614-1618.

      ZHANG Yaoling, HU Daogong, SHI Yuruo,et al. SHRIMP zircon U-Pb ages and tectonic significance of Maoniushan Formation vol-canic rocks in East Kunlun orogenic belt, China[J]. Geological Bulletin of China, 2010, 29(11):1614-1618.

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    出版历程
    • 收稿日期:  2017-01-10
    • 修回日期:  2017-05-01
    • 网络出版日期:  2022-07-28
    • 发布日期:  2017-09-04

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