Hydrothermal Metasomatism and Gold Mineralization of Porphyritic Granite in the Dongping Deposit, North Hebei, China: Evidence from Zircon Dating
Hydrothermal Metasomatism and Gold Mineralization of Porphyritic Granite in the Dongping Deposit, North Hebei, China: Evidence from Zircon Dating
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冀北东平矿床斑状花岗岩热液交代作用与金矿化：锆石测年证据
DOI：
10.3390/min8090363
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发表时间：
2018-08
期刊：
影响因子：
2.5
通讯作者：
Zhang Zeyan
中科院分区：
文献类型：
--
作者：
Wei Hao;Xu Jiuhua;Zhang Guorui;Cheng Xihui;Chu Haixia;Zhang Zeyan
东坪金存款矿区转枝莲段发现一斑状花岗岩侵入体。该斑状花岗岩岩体内部的断裂剪切带中Au的含量高达1吨，但关于该岩体的成因和时代，至今未见相关报道。本文采用锆石U-Pb定年方法，对斑状花岗岩进行了年代学研究，以寻找时代证据及与金矿化的关系。斑状花岗岩的锆石207 Pb/235 U-206 Pb/238 U一致年龄有两组：一致年龄为373.0 ± 3.5Ma，加权平均年龄为373.0 ± 6.4Ma;一致年龄为142.02 ± 1.2Ma，加权平均年龄为142.06 ± 0.84Ma。认为第一组可能代表碱性杂岩残留锆石的年龄，而第二组可能与主要金矿化有关。岩相学和电子探针分析结果表明，斑状石英和斑状花岗岩以及金矿化可能是富Si、Na、K的构造热液后期交代的产物。
A porphyritic granite intrusion was recently discovered in the Zhuanzhilian section of the Dongping gold deposit. There is as many as one tonnage of Au in the fractured shear zone within the porphyritic granite intrusion, but no relevant reports concerning the origin and age of the intrusion has been published as yet. In this paper, zircon U-Pb dating is used to study the geochronology of porphyritic granite, in order to find out the evidence of age and the relationship with gold mineralization. There are two groups of zircon 207Pb/235U-206Pb/238U concordant ages of porphyritic granites: The concordant age of 373.0 ± 3.5 Ma, with the weighted mean age of 373.0 ± 6.4 Ma; and the concordant age of 142.02 ± 1.2 Ma with the weighted mean age of 142.06 ± 0.84 Ma. We believe that the first group might represent the age of residual zircon of alkaline complex, while the second group might be related with main gold mineralization. The obtained results of the petrography and electron probe analysis indicate that the porphyritic quartz and porphyritic granite, as well as gold mineralization, might be products of a late replacement of tectonic-hydrothermal fluid, which was rich in Si, Na and K originally and later yielded gold-forming fluids.
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