| 魏小林,张得鑫,甘承萍,陈礼标.卡而却卡地区新元古代变质侵入岩体的发现及其地质意义[J].地质找矿论丛,2016,31(2):236-244 |
| 卡而却卡地区新元古代变质侵入岩体的发现及其地质意义 |
| Discovery and geological significance of Neoproterozoic intrusive body in the Kaerqueka area of the East Kunlun mountain |
| 投稿时间：2016-02-02 修订日期：2016-03-15 |
| DOI：10.6053/j.issn.1001-1412.2016.02.011 |
| 中文关键词: 卡而却卡地区 花岗片麻岩 地球化学 新元古代 Rodinia 东昆仑 青海省 |
| 英文关键词:Kaerqueka area granitic geniss Geochemistry Neoproterozoic era Rodinia East Kunlun mountain area Qinghai province |
| 基金项目:中国地质调查局"青海省东昆仑祁漫塔格地区铜多金属地质矿产调查"项目(编号:1212010818044)资助。 |
|
| 摘要点击次数: 1577 |
| 全文下载次数: 1332 |
| 中文摘要: |
| 卡而却卡地区地处东昆仑祁漫塔格成矿带内。通过对卡而却卡地区花岗片麻岩的岩石学、地球化学、同位素年代学的研究表明,区内原厘定的花岗片麻岩应为新元古代花岗岩。LA-ICP-MS锆石U-Pb同位素定年研究结果显示岩体侵位时代为910 Ma±3 Ma,时代为新元古代青白口纪;岩石具高SiO2、Al2O3、K2O,贫FeO、MgO、CaO特点;稀土元素分布模式为轻稀土富集,Eu中等亏损;岩石中不相容微量元素K、Rb、Ba、Th等强烈富集,Nb、Zr、Ce、Ta、Hf等富集一般,Y弱亏损。以上特征表明,岩石属于高钾钙碱性S型花岗岩,岩浆来源于陆壳部分熔融,形成于同碰撞环境,是东昆仑地区响应Rodinia超大陆汇聚事件的物质记录。 |
| 英文摘要: |
| Kaerqueka area is located at the Qimantage metallogenic belt in the East Kunlun mountain area.The formerly defined granitic gneiss in the area is the Neoproterozoic granites according to study on the petrology, geochemistry and isotope chronology. Zircon LA-ICP-MS U-Pb isotope dating show that the granite body emplaced at 910±3Ma corresponding to Qingbaikou period of the Neoproterozoic era. The granit is characterized by rich SiO2、Al2O3、K2O, poor FeO、MgO and CaO, REE pattern showing LREE enrichment, medium depletion of Eu, strong enrichment of incompatible trace element of K, Rb, Ba, Th, ordinary enrichment of Nb、Zr、Ce、Ta、Hf, weak depletion of Y. All this show that the granite is the high K, Ca alkaline S-type granite. The magma is from syn-collisional partial melting of continental crust. It is the material record of convergence of Rodinia super-continent. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
