| 西藏松多地区榴辉岩的原岩属性探讨及其地质意义 |
| |
| 引用本文： | 董宇超,解超明,范建军,于云鹏,郝宇杰.西藏松多地区榴辉岩的原岩属性探讨及其地质意义[J].地球科学,2019,44(7):2234-2248. |
| |
| 作者姓名： | 董宇超 解超明 范建军 于云鹏 郝宇杰 |
| |
| 作者单位： | 1.吉林大学地球科学学院, 吉林长春 130061 |
| |
| 基金项目： | 中国地质调查局区域地质调查项目121201010000150014国家自然科学基金项目41702227国家自然科学基金项目41402190中国地质调查局区域地质调查项目DD20160026 |
| |
| 摘 要： | 松多榴辉岩是约束拉萨板块中部古特提斯洋演化的重要材料，前人对其形成年代、变质P-T轨迹等诸多方面已进行了详细的研究，然而对其原岩的研究却较为薄弱，地球化学分析是恢复榴辉岩原岩的重要手段，也是反演区域古特提斯洋演化的重要依据.在系统收集区域地球化学数据的基础上，采集了17件松多榴辉岩样品，进行了地球化学研究，意在对区域构造演化提供新的制约.松多地区主要出露双矿物榴辉岩和退变质榴辉岩，两类榴辉岩都表现出亚碱性拉斑玄武岩的特征，在微量元素和各类构造环境判别图解中，两种榴辉岩分别都落入了N-MORB和E-MORB区域.基于上述分析结果，并结合区域地质资料，表明松多古特提斯洋在演化过程中可能长期存在地幔柱岩浆和正常洋中脊亏损地幔岩浆的相互作用.
|
| 关 键 词： | 西藏 松多地区 榴辉岩 地球化学 |
| 收稿时间： | 2019-04-29 |
Discussion on Protolith Properties of Eclogites in Sumdo Area,Tibet and Their Significance |
| |
| Abstract: | The Sumdo eclogite is an important material for constraining the evolution of the Paleo-Tethys in the central part of the Lhasa plate. Detailed studies have been carried out on its geochronological data and metamorphic P-T conditions. The study of eclogite protoliths is relatively weak. The geochemical analysis of eclogites is an important means to restore the composition of the original rocks, and it is also an important evidence for retrieving the evolution process of the Paleo-Tethys in the Sumdo area. Based on the systematic collection and classification of the previous geochemical data of Sumdo eclogite, 17 geochemical samples were collected from Sumdo eclogite for systematic analysis, which is intended to provide new constraints on regional tectonic evolution. Two types of eclogites were exposed in the Sumdo area, which are bimineralic eclogite and retrograded eclogite. Both types of eclogites are characterized by sub-alkaline basalts. In the trace elements and various tectonic environment discrimination diagrams, two kinds of eclogites are all in the N-MORB and E-MORB areas. Based on the above analysis results, combined with regional geological data, the interaction of the mantle plum mass and the normal mid-ocean ridge during the process of Paleo-Tethys Ocean has existed for a long time. |
| |
| Keywords: | |
|
| 点击此处可从《地球科学》浏览原始摘要信息 |
|
点击此处可从《地球科学》下载全文 |
|
