摘要
俄昌公仁地区地处西金乌兰—金沙江构造混杂岩带与北羌塘—昌都地体的交汇部位。文章通过对乌丽—开心岭尕笛考组火山岩岩石学、主量元素、稀土元素、微量元素等地质地球化学研究表明:尕笛考组火山岩为典型的钙碱性岩石组合,推断尕笛考组火山岩属于与板块俯冲作用有关的岩浆岛弧带的产物,形成于与板块俯冲作用有关的岛弧构造环境;锆石U-Pb同位素年代为258.5 Ma±4.6 Ma,属晚二叠世早期。
The Echanggongren area is situated at the intersection position of Xijinwulan-Jinshajiang river melange belt and the north Qiangtan-Changdu Terrian.Study on petrology,major element,REE and trace element geochemistry of volcanic rocks of Gadikao Formation show that the volcanic rock belongs to the typical calc-alkali rock series and is deduced to be the product of the plate subduction-related magmatic island arc.The zircon U-Pb age of 258.5 Ma±4.6 Ma belongs to Late Permian Period.
作者
王光辉
加永泽巴
邹建
宋福生
WANG Guanghui;JIA Yongzeba;ZOU Jian;SONG Fusheng(Sichuan Institute of Nuclear Geology,Chengdu 610052,China;College of Engineering Tibet University,Lhasa 850000 Tibet,China)
出处
《地质找矿论丛》
CAS
CSCD
2018年第3期417-424,共8页
Contributions to Geology and Mineral Resources Research
基金
中国地质调查局"青海省治多县俄昌公仁地区1:5万I46E012020
I46E013020
I46E014020三幅区域地质矿产调查项目"(编号:12120113033500)资助
关键词
尕笛考组
二叠纪火山岩
地球化学特征
构造环境
俄昌公仁地区
青海省
Gadikao Formation
Permian vocanic rocks
Geochemistry
tectonic setting
Echanggongren Prefecture
Qinghai province
