云南普朗斑岩铜矿床外围斑岩体LA-ICP-MS锆石U-Pb年龄及地质意义  

Geochronology Characteristics of Porphyry Body in the Periphery in Pulang Porphyry Copper Deposit of Yunnan

作　　者：杨帆 周晓丹[2] 吴静[2] 李峰 姚志华[1] 文书明 YANG Fan;ZHOU Xiaodan;WU Jingi;LI Feng;YAO Zhihua;WEN Shuming(Yunnan Copper(Group)Co.Ltd.,Kunming 650011,China;Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China.)

机构地区：[1]云南铜业(集团)有限公司,云南昆明650011 [2]国土资源工程学院,昆明理工大学,云南昆明650093

出　　处：《昆明理工大学学报（自然科学版）》2018年第6期34-45,共12页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51764037,51464029);校企合作项目(2016530101000172).

摘　　要：普朗超大型斑岩铜矿床为西南"三江"成矿带中最大的铜矿床,位于义敦岛弧带南端格咱弧东南部,是印支期斑岩型铜矿床的典型代表.普朗外围斑岩体中锆石形态和Th-U参数均显示典型的岩浆锆石特征,应用高精度锆石U-Pb测年方法获得,普朗外围东部石英闪长玢岩形成年龄为221. 3±0. 3 Ma;普朗外围北部石英闪长玢岩结晶年龄为210. 5±0. 3 Ma,石英二长斑岩结晶年龄为210. 0±0. 3 Ma;与普朗I号复式斑岩体的年龄基本一致,都为印支期岩浆活动的产物,外围北部石英二长斑岩和石英闪长玢岩的成岩年龄很接近,没有形成持续10 Ma以上的流体活动,成矿规模不及首采区大.The Pulang superlarge porphyry copper deposit is the largest copper deposit in the Southwest Sanjiang metallogenic belt,located at the southeast of the Geza Arc of south Yidun Island Arc Belt,typical of porphyry copper deposits in Indo-chinese epoch. Both zircon morphology and Th-U parameters show typical magmatic zircon characteristics of porphyry body in the periphery of Pulang porphyry copper deposit,By applying high precision zircon U-Pb dating method,we get the rock-forming age of diorite porphyrite in the east of Pulang and diorite porphyrite in the north of Pulang and monzonite porphyry in the north of Pulang are 221. 28 ± 0. 27 Ma,210. 45 ± 0. 25 Ma,209. 99 ± 0. 26 Ma respectively. It is basically consistent with the age of I rock mass. They are all products of magmatic activity in Indo-chinese epoch. The rock-forming age of diorite porphyrite and monzonite porphyry in the north of Pulang is very close. The fluid activity didn’t continue more than 10 Ma,so mineralization scale is less than the Pulang mining area.

关 键 词：锆石U-PB年龄 斑岩体 普朗矿床外围 云南 

分 类 号：P588.121[天文地球—岩石学] P597.3[天文地球—地质学]