Re-Os Dating for Molybdenitebearing Rock Samples: Application in Dazhuangke Molybdenum Deposit in Beijing

Abstract

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 ¹⁸⁷Re/¹⁸⁷Os. Molybdenite were rich in Re and radiogenic ¹⁸⁷Os. 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 large scale mineralization in East China, indicating that Mo mineralization was driven by lithosphere extension in East China.

Key words: molybdenite, whole rock sample, Re-Os dating, Mo deposit, Dazhuangke in Beijing

LIU Shu-Bei, LI Chao, CEN Kuang, JUE Wen-Dun. Re-Os Dating for Molybdenitebearing Rock Samples: Application in Dazhuangke Molybdenum Deposit in Beijing[J]. Geoscience, 2012, 26(2): 254-260.

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