摘要
通过对西藏羌塘中部冈塘错地区玄武岩地球化学特征研究,发现该区有OIB型和E-MORB型两类玄武岩.对两类玄武岩进行主量元素、稀土元素和微量元素地球化学图解分析及大地构造意义探讨,结合区域地质背景,认为冈塘错地区玄武岩形成于洋岛环境,可能受地幔柱岩浆活动影响,E-MORB型玄武岩的出现说明该区可能存在洋底高原.
By means of studying the geochemistry of basalt in the Oangtangcuo area, central Qiangtang, Tibetan. Found that there are two types of basalt： OIB-type basalt and E-MORB-type basalt. And based on geochemical diagram analysis to study major elements, rare earth elements ,trace element and tectonic significance of the two types basalt ,combined with regional geological background, I think Permian basalt in the area formed in an oceanic island environment, and may be subject to mantle plume magmatism response. E-MORB-type basalt was an indication that there may be oceanic plateaus in the area.
出处
《新疆地质》
CAS
CSCD
北大核心
2011年第3期332-336,共5页
Xinjiang Geology
基金
中国地质调查局西藏1:5万双湖角木日地区4幅区域地质调查项目(1212010818014)项目资助
关键词
西藏
羌塘
玄武岩
地球化学
构造环境
Tibet
Qingtang
Basalt
Geochemistry
Tectonic setting
