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Minerals 2018, 8(9), 363; https://doi.org/10.3390/min8090363

Hydrothermal Metasomatism and Gold Mineralization of Porphyritic Granite in the Dongping Deposit, North Hebei, China: Evidence from Zircon Dating

1
Geological Testing Center, Hebei GEO University, Shijiazhuang 050031, China
2
School of Civil and Environmental Engineering, University of Science and Technology, Beijing 100083, China
3
MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
4
School of Earth Sciences and Resources, China University of Geosciences, Bejiing 100083, China
*
Author to whom correspondence should be addressed.
Received: 30 June 2018 / Revised: 15 August 2018 / Accepted: 15 August 2018 / Published: 21 August 2018
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Abstract

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. View Full-Text
Keywords: porphyritic granite; zircon dating; hydrothermal metasomatism; Dongping gold deposit porphyritic granite; zircon dating; hydrothermal metasomatism; Dongping gold deposit
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Wei, H.; Xu, J.; Zhang, G.; Cheng, X.; Chu, H.; Bian, C.; Zhang, Z. Hydrothermal Metasomatism and Gold Mineralization of Porphyritic Granite in the Dongping Deposit, North Hebei, China: Evidence from Zircon Dating. Minerals 2018, 8, 363.

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