Abstract
The Weizigou Au deposit in Heilongjiang Province, NE China, located in the southern Jiamusi Massif, shows similarities to IOCG deposits. To determine the mineralization age, sources of ore-forming materials and genetic type, pyrite Re-Os dating, S-Pb isotopic analysis, in situ sulfur analysis and LA-ICP-MS analysis of trace elements in magnetite, pyrite and pyrrhotite were conducted. Four pyrite samples yielded a Re-Os isochron age of 197 ± 11 Ma, implying the occurrence a metallogenic event in the Early Jurassic. The δ34S values of sulfides display a relatively narrow range from 4.70‰ to 12.83‰ (mainly 9.90‰ to 12.83‰), which may be accounted for the extensively exposed granitic gneiss and meta-gabbro, with δ34S values of 7.44‰ to 8.44‰ and 4.37‰ to 10.54‰, respectively. Sulfide lead isotopic compositions have 206Pb/204Pb = 18.605–20.136, 207Pb/204Pb = 15.637–15.710 and 208Pb/204Pb = 38.534–39.129, indicating that the lead was derived from a mixed source. Magnetite has the characteristics of a lower Ti content and higher Zn content, indicating that it should be of hydrothermal origin, which may be related to IOCG-type mineralization. Pyrite and pyrrhotite have a Co/Ni ratio greater than 1 and a lower As content, indicating that they are of magmatic hydrothermal origin. Integrating the above analysis results, we inferred that the Weizigou Au deposit experienced the IOCG-type mineralization in the Middle-Late Permian, associated with magmatic-hydrothermal mineralization in the Early Jurassic.
Highlights
Iron oxide-copper-gold (IOCG) deposits are one of the main sources of copper (Cu) and gold (Au) in the world [1,2,3]
Trace element analysis of magnetite was conducted by LA-inductively coupled plasma mass spectrometry (ICP-MS) at the Wuhan Sample Solution Analytical Technology Co., Ltd., Wuhan, China
The LA-ICP-MS in situ trace element analysis of sulfides was performed at the State Key Laboratory of Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences
Summary
Iron oxide-copper-gold (IOCG) deposits are one of the main sources of copper (Cu) and gold (Au) in the world [1,2,3]. Our understanding of IOCG deposits has gradually deepened over the past two decades [9,12]. These deposits contain massive and disseminated iron oxides (magnetite and/or hematite). A detailed study of the Weizigou gold deposit is necessary in order to reveal whether it is an IOCG deposit. In this study, we conduct an LA-ICP-MS analysis of trace elements in magnetite, pyrite and pyrrhotite; pyrite Re-Os dating; an S-Pb isotopic and in situ analysis of sulfur isotopic data, integrating other obtained results, to constrain the sources of oreforming materials, determine the ore genesis and, reveal the details of the ore-forming process
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