成都理工大学学报（自然科学版）2011，Vol.38Issue(2)：204-210,7.
西藏措勤布嘎寺组中基性火山岩特征及成因
Characteristics and causes of the intermediate-basic volcanic rocks from Bugasi Formation in Cuoqin, Tibet, China
摘要
Abstract
The Cuoqin volcanic rocks of Miocene Bugasi Formation in Tibet are a set of potassic to ultrapotassic rocks. They are divided into two subgroups based on the chemical composition, that is, intermediate-acid group and intermediate-basic group. Based on previous studies, this paper further researches the tectonic setting, the nature of the source area and diagenesis by conducting the field geological investigation and doing geochemical analysis of the volcanic rocks from Bugasi Formation.The volcanic rocks are strongly enriched with LREE, large ion lithophile elements, high field strength elements to varying degrees, and weak negative Eu anomaly. They formed in an intra-continental extensional environment after the collision of Qinghai-Tibet Plateau and are probably the products formed by partial melting of the rocks from upper mantle and crust of different depths with different degrees. The formation and distribution is also controlled by the north-south graben which generated by the tectonic detachment and extension of Late Cenozoic on Qinghai-Tibet Plateau.关键词
西藏错勘/布嘎寺组/中基性火山岩/源区性质/成因Key words
Cuoqin/ Tibet/ Bugasi Formation/ intermediate-basic volcanic rock/ source region/ cause分类
天文与地球科学引用本文复制引用
张巨,马润则,岳相元,李娜..西藏措勤布嘎寺组中基性火山岩特征及成因[J].成都理工大学学报（自然科学版）,2011,38(2):204-210,7.基金项目
矿物学、岩石学、矿床学国家重点(培育)学科建设基金资助项目(SZD0407) （培育）
中国地质调查局区域地质调查项目 （）
