西北地质2013，Vol.46Issue(1)：32-39,8.
祁漫塔格中部元古代高钾(变质)侵入岩体的发现及其地质意义
The Discovery and Geological Significance of Proterozoic Intrusive Rock with High-K in the Central of Qimantage Area
摘要
Abstract
Five metamorphic intermediate-acid intrusive rock bodies in Proterozoic have been identified in the central Qimantage by the 1:50000 mineral prospect survey. The intermediate-acid intrusive rock bodies located in amphibolite facies the volcanic-sedimentary rocks are gray-pale flesh red two-feldspar gneiss with eye-shaped. The two-feldspar granites are their original rocks. Zircon U-Pb age is of 832±12 Ma on average, which are known the oldest intermediate-acid intrusive magma products. Geochemistry of rocks is as follows: high K2O (4. 92-5. 76 × 10-2), poor FeO, MgO, and CaO. Rocks with high-K are calc-alkaline S-type high-evolution granites that were formed about 34. 7 km in crustal thickness. Tectonic setting is shown sys-collision by R1-R2 discriminant diagrams. Rodinia continent closed at about 830 Ma in the East Kunlun. Intermediate-acid magma action reproduced in early Paleozoic. In this process Rodinia breakup and plates in low latitudes moved to high-latitude. The discovery is important to know the structure evolution of early Paleozoic in East Kunlun.关键词
祁漫塔格/东昆仑/元古宙/高钾(变质)侵入岩体/地球化学Key words
Qimantage/ East Kunlun/ Proterozoic/ intrusive rock bodies with high-K/ geochemistry分类
天文与地球科学引用本文复制引用
马文,丁玉进,李社宏,张志青,胡兰基,李五福,刘世宝,马延景..祁漫塔格中部元古代高钾(变质)侵入岩体的发现及其地质意义[J].西北地质,2013,46(1):32-39,8.基金项目
中国地质调查局"青海乌兰乌珠儿-祁漫塔格地区1∶5万八幅联测"项目 （）
