Genesis of Xingfengshan Au-W Deposit in Central Hunan Province:Constraints from Hydrothermal Apatite U-Pb Dating and In Situ S Isotopes
Xingfengshan is a representative gold-tungsten deposit in the Xiangzhong metallogenic belt.The age of gold mineralization,the source of ore-forming metals and the genesis of the deposit are still controversial.Based on detailed petrographic observation and LA-(MC)-ICP-MS analysis,in situ U-Pb dating of hydrothermal apatite and in situ S-isotope analysis of arsenopyrite in the auriferous quartz veins are carried out in this paper to constrain the age of gold mineralization,trace the source of ore-forming metals,and deepen the understanding of the genesis of the deposit.The U-Pb age of hydrothermal apatite in gold-bearing quartz veins is 215.1±7.5 Ma,which is consistent with the intrusion age of the Baimashan complex.The δ34S values of arsenopyrite are centrally distributed between-9.2‰ to-7.7‰,indicating that the ore-forming metal is derived from a mixture of magmatic-hydrothermal fluids and host rocks..The study shows that the W mineralization and Au mineralization of the Xingfengshan deposit occurred in the Late Triassic,and both may be the products of magmatic activities of the Baimashan igneous complex,and the Xingfengshan deposit should belong to the intrusion-related gold deposit.
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