北京大学学报：自然科学版2012，Vol.48Issue(4)：617-628,12.
内蒙古前进场岩体岩石学与锆石U-Pb年代学研究
Petrology and LA-ICP-MS Zircon U-Pb Geochronology of the Qianjinchang Pluton, Southeastern Inner Mongolia
摘要
Abstract
The Qianjinchang biotite granite from southeastern Inner Mongolia is located in the suture zone between the Siberian and North China Cratons. The Daolundaba Cu-W-Sn polymetallic deposit formed at the contact zone between the north-west margin of the pluton and the Lower Permian Linxi Formation. The biotite granite is high-K calc-alkaline and peraluminous, with Na2O+K2O: 6.12% to 9.31%, Al2O3: 14.42% to 15.59%, A/CNK: 1.09 to 1.22, and a mean 5value of 2.41. The rock samples lie within the S-type granite region in the ACF plot. They are depleted in Sr (89.91 to 192.80 μg/g), Ba, Eu (δEu: 0.46 to 0.81) and δREE (102.65 to 237.92 μg/g), but slightly enriched in Yb (2.17 to 3.46 μg/g) and La, consistent with the characteristics of S-type granites. The rocks further fall in the region of post-collisional granite in the Rb vs. Y+Nb diagram. LA-ICP-MS zircon U-Pb geochronology shows that the pluton emplaced at (273±7.7) to (278 ±4.3) Ma. These Permian granite rocks probably formed in an extensional setting that postdated the collision between the Siberian and North China Cratons.关键词
前进场岩体/锆石U-Pb定年/内蒙古Key words
Qianjinchang pluton/zircon U-Pb dating/Inner Mongolia分类
天文与地球科学引用本文复制引用
徐佳佳,赖勇,崔栋,鲁彬..内蒙古前进场岩体岩石学与锆石U-Pb年代学研究[J].北京大学学报：自然科学版,2012,48(4):617-628,12.基金项目
中国地质调查局地质调查工作项目（1212010813045）资助 （）
