成都理工大学学报（自然科学版）2011，Vol.38Issue(5)：563-570,8.
西藏措勤—赛利普地区新生代火山岩地球化学特征
Geochemical characteristics of Cenozoic volcanic rocks in the Cuoqin-Sailipu area, Tibet, China
摘要
Abstract
The Lhasa block of the Tibetan plateau is one of the main areas collided by the Indian plate and Eurasian plate. The extensively developed magmatic rocks in this area record the whole process which the Cenozoic India continental lithosphere subducted to north and the type of magmatism of Lhasa block after collision and collision-after. The geochemical analysis of the Cenozoic volcanic rocks and Sr, Nd isotopic data from the Cuoqin-Sailipu area indicate that the volcanic rocks transiste from calcium rock to alkaline-high potassium calcium rock and then to alkaline-shoshonitic rock and are characterized by rich alkali and high potassium. Sr isotope increases while Nd isotope decreases, and 87Sr/86 Sr=0.710352~0. 732268, εNd = -3.41～-15.82. The geochemical type is obviously different from that in northern Tibetan plateau of geochemical provinces, namely, the 87Sr/86Sr ratio in this area is higher while the εNd is lower. This shows that the Lhasa block absorbs more components of the Himalayan continent curst end than the north of Qinghai-Tibet plateau in the northward subduction process of the Cenozoic India continental lithosphere; In the early and middle Miocene, Indian continent already subducted with A type northward to Lhasa block western basement fault and affected the lithosphere partial melting and lithosphere dialysis on different levels of rocks.关键词
西藏/拉萨地块/措勤—赛利普地区/新生代火山岩/地球化学特征Key words
Tibetan/ Lhasa block/ Sailipu area/ Cenozoic volcanic rock/ geochemical characteristics分类
天文与地球科学引用本文复制引用
岳相元,马润则,张巨..西藏措勤—赛利普地区新生代火山岩地球化学特征[J].成都理工大学学报（自然科学版）,2011,38(5):563-570,8.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 （）
