![]() δ 18O values of wolframite are relatively homogeneous, ranging from +4.8‰ to +6.3‰. δ 34S values of the sulfides range from −1.6 to +0.1‰, indicative of a magmatic source of sulfur. ![]() Mixing is the dominant mechanism of wolframite precipitation in Xihuashan. Although boiling occurred during vein-type mineralization, it seems negligible for wolframite deposition. Enthalpy–salinity plot shows a linear relationship, implying mixing of different sources of fluids. These distinct differences suggest that those conventional microthermometric data from quartz are not adequate to explain the ore formation process. Fluid inclusions in wolframite have relatively higher homogenization temperatures and salinities (239–380☌, 3.8–13.7 wt.% NaCl equiv) compared with those in quartz (177–329☌, 0.9–8.1 wt.% NaCl equiv). There are only two-phase aqueous-rich inclusions in wolframite but at least three major types of inclusions in quartz: two- or three-phase CO 2-rich inclusions, two-phase pure CO 2 inclusions and two-phase aqueous inclusions, indicating boiling. The ore mineral assemblage includes wolframite and molybdenite, with minor amounts of arsenopyrite, chalcopyrite, and pyrite. ![]() There are two major sets of subparallel ore-bearing quartz veins. The Xihuashan tungsten deposit, Jiangxi province, China, is a world-class vein-type ore deposit hosted in Cambrian strata and Mesozoic granitic intrusions.
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