地质通报2012，Vol.31Issue(2)：463-468,6.
青海西部祁漫塔格山卡尔却卡铜多金属矿床似斑状黑云二长花岗岩LA-ICP-MS锆石U-Pb年龄
Zircon LA-ICP-MS U-Pb age of monzogranites in the Kaerqueka copper-polymetallic deposit of Qimantag, western Qinghai Province
摘要
Abstract
The Kaerqueka copper-polymetallic ore bodied in Qimantage region can mainly be found in monzonitic granite and skarn belts located in the contact zones between granodiorite, porphyritic biotitic monzogranite and Cambrian-Ordovician strata. Based on LA-ICP-MS U-Pb chronological study of zircons, the authors obtained the age (410.1Ma±2.6Ma) of biotitic monzogranite close to VE ore belt. Nevertheless, other researchers hold that the rock-forming and ore-forming processes took place in Indo-Chinese period based on the age of granodiorite (237Ma±2Ma) and the Re-Os model age (239Ma) of molybdenite. A comparison of the geochemi-cal characteristics between the two rock bodies has led the authors to reach the conclusion diat the mineralization was related not only to the Indo-Chinese intermediate-acid intrusive rocks but also to the late Caledonian acid intrusive rocks, and there existed a difference in magma origin between porphyritic biotitic monzogranite and granodiorite, suggesting that they were formed in different peri-ods of tectonic evolution. Ore deposits in Qiirantag region were formed in late Caledonian and in Indo-Chinese period. Although the outcrop of late Caledonian period is not so apparent as the one of Indo-Chinese period, due attention should be paid to the contribution of late Caledonian intiusives to mineralization.关键词
LA-ICP-MS锆石U-Pb年龄/祁漫塔格/卡尔却卡/二长花岗岩Key words
LA-ICP-MS zircon U-Pb age/ Qimantag/ Kaerqueka/ monzogranite分类
天文与地球科学引用本文复制引用
陈博,栗亚芝,张占玉,耿建珍,贾群子,宋忠宝,张晓飞,陈向阳,全守村,张雨莲..青海西部祁漫塔格山卡尔却卡铜多金属矿床似斑状黑云二长花岗岩LA-ICP-MS锆石U-Pb年龄[J].地质通报,2012,31(2):463-468,6.基金项目
中国地质调查局项目《青海省地质调查综合研究》(编号:1212010918044)和《青海省岩浆岩时空分布与成矿作用研究》(编号:1212011121089) （编号:1212010918044）
