措勤盆地冈底斯构造带侵入岩岩石地球化学特征及构造成因分析  被引量:4

Petrogeochemical characteristics and tectonic origin of intrusive rocks in Gangdese tectonic belt of Cuoqin basin, Tibet

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作  者:宋全友[1] 秦勇[1] 

机构地区:[1]中国矿业大学,江苏徐州221008

出  处:《西北地质》2002年第3期99-105,共7页Northwestern Geology

基  金:中国石油天然气集团公司青藏项目 (CQ95 YZ1- 0 10 2 CQ96 YZ2 - 0 10 2 )部分成果

摘  要:冈底斯构造带为措勤盆地一主要 级构造单元。该带中、新生代岩浆活动异常强烈 ,形成从中性闪长岩到酸性花岗岩完整的中酸性花岗岩侵入岩带。通过对侵入岩体的岩石类型、岩石化学特征、岩石地球化学特征研究 ,认为该岩浆岩带侵入岩体主要为花岗闪长岩、二长花岗岩、石英二长岩等 ,属钙碱性岩石系列 ,具“ ”型花岗岩的特征 ,是新特提斯洋壳沿雅鲁藏布江断裂带向北俯冲引起下地壳物质熔融向上侵入所致 ,为燕山晚期Gangdese tectonic belt is a major one in Cuoqin basin, in which the magmatic action was very strong in the periord of Mesozoic and Cenozoic era This study shows it belongs to a complete intrusive rocks belt from intermediate diorite to acid granite The study on the rock types, petrochemical characteristics and petogeochemical characteristics of the intrusive rocks reveals that its rock types are dominated by granodiorite, adamellite and quartz monzonite which belong to calc alkalic rock series and have the characteristics of 'Ⅰ'granite They are the products of lower crustal matter melting and uptruding caused by the northward subduction of the New Tethyan crust along the Yarlung Fracture in the late Yanshanian period

关 键 词:措勤盆地 侵入岩 岩石地球化学 构造成因分析 冈底斯构造带 构造环境 花岗岩 岩浆活动 

分 类 号:P588.12[天文地球—岩石学]

 

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