摘要
The Huangsha Ag-rich tungsten deposit is genetically related to a buried granite which shows apparent vertical zoning in alteration.Greisen-type W(Mo) ores coccur at the top or the intrusive and sulfide-wolframite-quartz veins developed at the major stage of mineralization are present in low-grade metamorphic rocks in the outer-contacts.The veins exhibit a reversed zonation in the vertical section with silver concentrated in the lower part in association with sulfides.Micas,characterized by high Si and low Al.are extensively developed both in the granite and in the veins.They have similar cell parameters.belonging to 2M1 type,but those in the veins are understanding of the petrogenesis, evolution and mineralization of the granite.
The Huangsha Ag-rich tungsten deposit is genetically related to a buried granite which shows ap- parent vertical zoning in alteration.Greisen-type W(Mo)ores occur at the top of the intrusive and sulfide-wolframite-quartz veins developed at the major stage of mineralization are present in low-grade metamorphic rocks in the outer-contacts.The veins exhibit a reversed zonation in the vertical section with silver concentrated in the lower part in association with sulfides. Micas,characterized by high Si and low Al.are extensively developed both in the granite and in the veins.They have similar cell parameters,belonging to 2M_1 type,but those in the veins are much F-and water-richer.The REE geochemistry of micas may provide important keys for a better understanding of the petrogenesis,evolution and mineralization of the granite.
