地质通报2018，Vol.37Issue(4)：613-620,8.
青海南祁连科克岩体地球化学特征及其形成时代
Geochemical characteristics and formation age of Keke Pluton in South Qilian Mountain,Qinghai Province
摘要
Abstract
Lying in the middle of Kaketumengke Mountain,the Keke pluton which was formed in Middle Ordovician is located in the southeastern part of South Qilian massif.Geochemical and geochronological studies were conducted to investigate the tectonic at-tribute of the Keke pluton. The pluton is mainly composed of syenogranite and is characterized by high content of SiO2(68.41%~73.10%)and high content of Al2O3(13.03%~14.35%).Geochemical data also show depletion of Nb,P,Ti and HREE with Eu nega-tive anomaly.The REE patterns show the characteristics of crustal anatectic granite,and the genetic classification diagram shows that the granite was formed in a syn-collisional setting.LA-ICP-MS zircon U-Pb dating shows that gneissic granite was formed at 461±2.7Ma.Combined with regional geology,the authors hold that Keke pluton was probably derived from the source of the crust and re-sulted from syn-collision,which supports the argument of compressive regime of the Qilian block during the Mid-Ordovician and is of great significance for the further study of the evolution of the Qilian block.关键词
LA-ICP-MS锆石U-Pb测年/地球化学/南祁连Key words
LA-ICP-MS zircon U-Pb dating/geochemistry/South Qilian Mountain分类
天文与地球科学引用本文复制引用
袁勇,孙东亮,李大磊,李小明,付渝..青海南祁连科克岩体地球化学特征及其形成时代[J].地质通报,2018,37(4):613-620,8.基金项目
中国地质调查局项目《祁连成矿带肃南—大柴旦地质矿产调查项目》(编号:12120114018101) （编号:12120114018101）
