黄铁矿Re Os法测年在胶东金矿中的应用初探

摘要

This work is a first study of pyrite Re Os isotopic dating on gold deposits in Jiaodong Peninsula. An isochron age of (144.8±1.8)Ma from 3 pyrite samples in Dayingezhaung gold deposit has been gained, which im⁃plies the existence of late Jurassic gold mineralization in Dayingezhuang gold deposit. According to this study on py⁃rite Re Os isotope chronology of Dayingezhuang, Xiadian and Tudui gold deposit, the Re Os isotopic character⁃istics of pyrite in Jiaodong gold deposit are definitely complicated. Factors which can affect the results of pyrite Re Os isotopic dating have been summarized. In order to get more precise and responsible ages of gold deposits by u⁃sing pyrite Re Os isotopic dating,pyrite samples in different stages should be sent separately, sampling distance should be prolonged, and testing errors should be reduced.%该次工作为黄铁矿Re Os法测年在胶东金矿中的首次应用。在大尹格庄金矿中获得了由3件黄铁矿样品组成的（144．8±1．8）Ma等时线年龄，暗示着大尹格庄金矿区可能存在一期晚侏罗世的Au成矿事件。通过对大尹格庄、夏甸、土堆金矿黄铁矿Re Os同位素年代学的研究，表明黄铁矿的Re Os同位素特征在胶东金矿中具有一定的复杂性。该文总结了影响黄铁矿Re Os同位素测年结果的因素，认为在利用该方法进行金矿床定年时，应当将不同期次黄铁矿分别送样，适当拉大采样间距，并尽可能降低实验测试误差，以期获得更精确可靠的年龄。