Ore genesis of the Fancha gold deposit, Xiaoqinling goldfield, southern margin of the North China Craton: Constraints from pyrite Re-Os geochronology and He-Ar, in-situ S-Pb isotopes

The Fancha gold deposit is one of the representative “lode type” deposit in the Xiaoqinling goldfield. Four-stage mineralization process were identified, namely, I) the barren quartz stage; II) the pyrite-dominated stage; III) the quartz-polymetallic sulfides stage; and IV) the quartz-carbonate stage. Correspondingly, pyrite crystal can be divided into three generations, i.e. Py1, Py2 and Py3 according to their different textures and paragenesis...