现代地质2012，Vol.26Issue(2)：254-260,7.
含辉钼矿全岩样品Re-Os同位素定年研究:在北京大庄科钼矿床中的应用
Re-Os Dating for Molybdenite-bearing Rock Samples: Application in Dazhuangke Molybdenum Deposit in Beijing
摘要
Abstract
A simple and rapid method for preliminary determination of rhenium using nitric acid in colorimetric tube was described, the method was identified by analyzing the standard reference molybdenite sample and the results were in good with the certified value. The object of the traditional Re-Os isotope dating for molybdenite was pure mineral, and the Re-Os age was obtained due to the values I8·Re/187Os. Molybdenite were rich in Re and radiogenic l87Os. In contrast, silicate mineral incorporates essentially was not involving Re and Os. Therefore, molybdenite-bearing rock samples were tried for Re-Os dating, and the molybdenite testing process of this method reducing the molybdenite processing can save a lot of time and avoid the cross contamination. Re-Os model ages for molybdenite-bearing whole rock samples collected from the Dazhuangke deposit range from (135.7 ±2. 2) to (137. 7 ±2. 1) Ma, and the isochrone age was (137. 6 ±3. 7) Ma. The Re-Os age of molybdenite-bearing whole rock samples were nearly same to the Re-Os age of pure molybdenite mineral samples. The molybdenite Re-Os age was identical to the U-Pb zircon age for the quartz-monzonite, showing that the Mo mineralization of the Dazhuangke molybdenum deposit has a close relationship with the intrusion of quartz-monzonite. The age of the Dazhuangke molybdenum deposit was consistent with the second period of largescale mineralization in East China, indicating that Mo mineralization was driven by lithosphere extension inEast China.关键词
辉钼矿/全岩样品/Re-Os测年/钼矿床/北京大庄科Key words
molybdenite/whole rock sample/ Re-Os dating/Mo deposit/ Dazhuangke in Beijing分类
天文与地球科学引用本文复制引用
刘舒波,李超,岑况,屈文俊..含辉钼矿全岩样品Re-Os同位素定年研究:在北京大庄科钼矿床中的应用[J].现代地质,2012,26(2):254-260,7.基金项目
中国地质调查局地质大调查项目"我国重要矿产和区域成矿规律研究"(1212010633903). （1212010633903）
