沉积与特提斯地质Issue(2)：97-103,7.
西藏东巧地区玄武岩地球化学特征及构造环境分析
Geochemical signatures and tectonic setting of the basalts from the Dongqiao region, Xizang
黄强太 1夏斌 2李强 1钟云 3胡西冲 4郑浩4
作者信息
- 1. 中国科学院广州地球化学研究所，广东广州 510640
- 2. 中国科学院大学，北京 100049
- 3. 中山大学海洋学院，广东广州 510275
- 4. 中山大学海洋学院，广东广州 510275
- 折叠
摘要
Abstract
The Dongqiao ophiolites crop out mostly in the central part of the Bangong Lake-Nujiang suture zone,in which the ophiolites are well preserved. The trace and rare earth element analyses show that the basalts in the Dongqiao ophiolites display the noticeably LREE-enriched right-leaning REE distribution patterns. La/YbN =7. 05-12. 02. The elements Th,Nb,Ta,Zr and Hf exhibit slightly positive anomalies. The geochemical signatures cited above have disclosed that these basalts are assigned to the oceanic-island basalts( OIB),and remarkably vary from the mid-oceanic ridge basalts( MORB )and island-arc basalts( IAB ). The basalts in the Dongqiao ophiolites are interpreted to be formed in the oceanic-island environments where the lithospheric uplifting took place in the oceanic plates,and represent the oceanic lithospheric remnants in the oceanic-island enviroments during the formation and development of the Bangong Lake-Nujiang oceanic basin.关键词
地球化学/构造环境/玄武岩/东巧/西藏Key words
geochemistry/tectonic setting/basalt/Dongqiao/Xizang分类
天文与地球科学引用本文复制引用
黄强太,夏斌,李强,钟云,胡西冲,郑浩..西藏东巧地区玄武岩地球化学特征及构造环境分析[J].沉积与特提斯地质,2015,(2):97-103,7.
