岩矿测试Issue(6)：900-907,8.DOI:10.15898/j.cnki.11-2131/td.2014.06.022
应用辉钼矿Re－Os定年技术研究青海什多龙矽卡岩型钼铅锌矿床的地球动力学背景
Re-Os Molybdenite Ages of the Shenduolong Skarn Mo-Pb-Zn Deposit and Geodynamic Framework,Qinghai Province
摘要
Abstract
The Shiduolong skarn Mo-Pb-Zn deposit is located in the multi-metal metallogenic belt of E’lashan.The precise age of the ore deposit limits our understanding of the ore-forming processes and geodynamical setting.In spite of the K-Ar methods of analysis and testing in the Shiduolong mining area and the periphery of intrusives (1 88-208 Ma and 368 Ma),whether or not thest ages can represent real mineralization times requires to be tested further.In this study,we carried out a Re-Os study of molybdenite from the Shuangqing deposit,providing fundamental data to build the mineral deposit model and reflect the geodynamical setting in this area.6 molybdenite samples of the deposit yield Re-Os isotopic model ages ranging from 234.2 Ma to 240.1 Ma,with a weighted mean age of (236.2 ±2.1 )Ma.A similar isochron age of (233.4 ±9.6 )Ma is also obtained by the isochron regression.This result suggests that the Mo mineralization occurred in last Triassic.The Re contents of molybdenite indicate that ore-forming materials are derived from crust and aqueous fluids involved in the ore-forming stage. Based on the same of rock-forming in E ’lashan and mineralization in Shiduolong Mo-Pb-Zn deposit,rock-forming and ore-forming were regarded as the same geodynamic background of India-Eurasia collision.The tectonic regime changing from developing oceanic rift to collision-extension make the thickened lower crust melt partially in the Indosinian magmatic-tectonic-metallogenic event.关键词
辉钼矿/Re-Os定年/矽卡岩矿床/成矿时代/地球动力学背景/青海什多龙Key words
molybdenite/Re-Os aging/skarn deposit/rock-forming time/geodynamic framework/Shiduolong in Qinghai Province分类
天文与地球科学引用本文复制引用
李文良,夏锐,卿敏,李超,张栋,孙昊,路英川,刘鹏,周奥博..应用辉钼矿Re－Os定年技术研究青海什多龙矽卡岩型钼铅锌矿床的地球动力学背景[J].岩矿测试,2014,(6):900-907,8.基金项目
中国地质调查局地质矿产调查项目“青海都兰-同德-甘德金多金属矿产调查评价” （）
