| 中祁连西段托赖岩群变质岩的原岩恢复及其构造环境 |
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| 引用本文： | 王龙,宇峰,刘智贤,徐晓飞,贾雨阳.中祁连西段托赖岩群变质岩的原岩恢复及其构造环境[J].地质通报,2016,35(9):1448-1455. |
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| 作者姓名： | 王龙 宇峰 刘智贤 徐晓飞 贾雨阳 |
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| 作者单位： | 陕西区域地质矿产研究院, 陕西 咸阳 712000 |
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| 基金项目： | 中国地质调查局项目（编号：1212011221149） |
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| 摘 要： | 对托赖岩群变质岩的岩石特征及地球化学进行研究,结果显示,托赖岩群中的片岩、片麻岩、石英岩、大理岩的原岩为沉积岩,其中片岩、片麻岩原岩为砂质岩、杂砂岩;石英岩原岩为石英砂屑岩;大理岩原岩为灰岩、白云岩。斜长角闪岩原岩为中基性火山岩,岩性为玄武安山岩。变质基性火山岩的构造环境判别结果表明,其形成于板内环境,作为托赖岩群中的特殊夹层,暗示托赖岩群沉积岩的原岩形成环境与变质火山岩的构造环境一致。
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| 关 键 词： | 中祁连山 托赖岩群 原岩恢复 构造环境 |
| 收稿时间： | 2015/12/31 0:00:00 |
| 修稿时间： | 2016/4/26 0:00:00 |
Reconstruction of protoliths of metamorphic rocks of the Tuolai Group and its tectonic setting |
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| WANG Long,YU Feng,LIU Zhixian,XU Xiaofei and JIA Yuyang.Reconstruction of protoliths of metamorphic rocks of the Tuolai Group and its tectonic setting[J].Geologcal Bulletin OF China,2016,35(9):1448-1455. |
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| Authors: | WANG Long YU Feng LIU Zhixian XU Xiaofei and JIA Yuyang |
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| Institution: | Academy of Regional Geological Survey and Mineral Resources Exploration of Shaanxi, Xianyang 712000, Shaanxi, China |
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| Abstract: | A study of the nature of the protoliths of metamorphic rocks in the Tuolai Group and their tectonic setting shows that the schist, gneiss, quartzite and marble in metamorphic rocks of the Tuolai Group are originally sedimentary rocks, and the amphibolite in metamorphic rocks of the Tuolai Group is basic volcanic rock. The protolith of schist and gneiss is greywacke, the quartzite is quartz sandstone, the marble is dolostone and limestone, and the amphibolite is basaltic andesite. Discrimination of the tectonic setting of meta-volcanic rock indicates that the amphibolite formed in an intracontinental rift environment. As the special interlayer of Tuolai Group, the metasedimentary rocks should have the same tectonic environment as the anphibolite, both formed in an extensional basin. |
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| Keywords: | Mid-Qilian massif Tuolai Group protoliths reconstruction tectonic setting |
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