地质力学学报2017，Vol.23Issue(4)：567-576,10.
青海省亚马托侵入岩地球化学特征及其LA-ICP-MS锆石U-Pb测年的构造意义
THE GEOCHEMICAL CHARACTERISTICS AND TECTONIC SIGNIFICANCE OF LA-ICP-MS ZIRCON U-PB DATING OF YAMATUO INTRUSIVE ROCKS, QINHAI PROVINCE
摘要
Abstract
Yamatuo intrusive rocks, distributing in the northern margin of Qaidam basin, compose the east part of Tataleng River batholith. The lithology of these rocks is the combination of porphyritic-like syenogranite and porphyritic monzogranite. The phenocryst content in the rocks is 6~25% and its grain size is 1~5 cm, revealing rapakivi texture. The geochemical characteristics show that Eu is with obvious depleted characteristics reflecting the strong fractional crystallization of rocks which is very similar to crustal-derived granite ( S) . All the facts indicate the intrusive rocks are the partial melting of the crust, belonging to the mixture of crust-derived magmatite in post-collisional tectonic setting. The result analysis of LA-ICP-MS zircon U-Pb dating indicates that the rock mass was formed in early Silurian 429. 9 ± 1. 4 Ma, being the signature of the end or near the end of the orogenic process in early Paleozoic This finding provides important chronological constraints for further study of the tectonic evolution of the northern margin of Qaidam orogenic belt.关键词
柴北缘/亚马托侵入岩/地球化学/LA-ICP-MS锆石U-Pb测年Key words
northern margin of Qaidam basin/Yamatuo intrusive rock/geochemistry/LA-ICP-MS zircon U-Pb dating分类
天文与地球科学引用本文复制引用
孙健,孙东亮..青海省亚马托侵入岩地球化学特征及其LA-ICP-MS锆石U-Pb测年的构造意义[J].地质力学学报,2017,23(4):567-576,10.基金项目
中国地质调查局青藏地质调查工作项目 (12120114018101) （12120114018101）
