北祁连中东段古元古代托赖岩群中变质侵入岩(体)的发现及其地质意义  

The geological significance and determination of age of the imetamorphic intrusion of Paleoproterozoic Tuolai Rock Group in the mid- eastern part of the North Qilian Mountains

作　　者：董进生[1] 谈晓樱 刘建栋[1] 殷占虎[1] 

机构地区：[1]青海省地质调查院青海省青藏高原北部地质过程与矿产资源重点实验室,青海西宁810012 [2]青海省第一地质矿产勘察院,青海西宁810600

出　　处：《青海大学学报（自然科学版）》2015年第3期73-79,共7页Journal of Qinghai University(Natural Science)

基　　金：中国地质调查局地质大调查项目(1212011121192)

摘　　要：为探讨北祁连构造岩浆带发展演化,在北祁连中东段古元古代托赖岩群中采集一套变质侵入体,岩性为二长花岗质片麻岩、片麻状石英二长岩,通过单颗粒锆石铀—铅同位素测年,该变质侵入体年龄为(1 150±3)Ma,时代为晚蓟县世,侵入体具有过铝钙碱性系列的特征,是同碰撞环境下岩浆作用产物。该套变质侵入岩的发现,对于北祁连中东段前震旦纪基底的深入研究及更进一步恢复和确定北祁连构造岩浆带发展演化世具有重要意义。In order to explore the North Qilian tectonic magmatic evolution development zone in northern Qilian ,a set of metamorphic intrusive body samples with monzogranite gneiss and gneissic quartz monzonite of the Middle East section of Paleoproterozoic rock group was collected .The single Zircon U-Pb isotopic dating reveals that the age of metamorphic intrusive body is （1 150 ±3）Ma, belonging to late Jixian Period .The intrusions have the characteristics of aluminum calc alkaline se-ries,with magmatic products under impact environment .The metamorphic intrusive rocks found in northern Qilian has important significance on the research of the Middle East section of pre Sinian basement and further restoration and determination of the North Qilian tectonic magmatic belt deve-lopment and evolution .

关 键 词：变质侵入体 同碰撞环境 北祁连 

分 类 号：P59[天文地球—地球化学]