Geological Features and H-O-S-Pb Isotopes of Au (-Sb-W) Deposit in South China’s Xuefeng Arcuate Mineralization Belt


Abstract

Xuefeng arcuate mineralization belt is one of the key gold-bearing polymetallic mineralization belts in South China. This paper analyses the sulphide, lead, hydrogen and oxygen isotopes of three typical deposits in the belt. The results show that the ï¤34S values of Bake gold deposit in the south varies significantly but consistently with the sulphide range of the local Banxi Group stratum, indicating that the mineral-bound sulphide came from the local stratum. To the north, the ï¤34S values of Zhazixi Sb-Au deposit have a small range as does the northern-most Woxi Au-Sb-W deposit. In particular, the ï¤34S values of Woxi deposit fall within 2.8‰~-1.5‰, which is consistent with the sulphide content in granite. This means the sulphur mainly originates from magmatite. According to the isotope analysis of hydrogen and oxygen, most of the fluids derived from formation water and meteoric water in the south, and from magmatic water and metamorphic water in the middle and northern parts. Comprehensive analysis of mineralization geology and tectonic evolution leads to the conclusion that the minerals formed in the Early Paleozoic period functioned as the depositional stratum, the mineralization in the Indosinian movements during Jurassic-Cretaceous period was mainly driven by magmatic fluid.

Keywords

Xuefeng Belt, Isotopes Analysis, Mineralization, Sources.

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