Geological Characteristics And Ore Genesis Of The Yariheshi Gold Deposit,Southwest Qinghai Province

The Yariheshi gold deposit is located in Buqingshan-Jishishan Mineralization,which belongs to Bukadaban-Animaqing Variscan-indosinian metallogenic belt.The found of Yariheshi gold deposit is significance for prospecting work with low degree of geological study.The metallogenic geological setting was well studied with yaers of prospecting works.The deposit has been found 3 gold-bearing structural alteration zones which contained 14 gold orebodies.The Au mineralization has coler relationship with fractures and porphyry veins but not stratum and lithology.The orebodies have same direction with tectonic line and controlled by structural alteration zones.It is primary identified that the deposit belongs to structural altered rock-host gold deposit.The metallogenic model shows that Au enrichment has 2 periods.In the early mineralization,the nearly WE faults provide interspace for intermediate acid porphyry intrusion and gold enrichment.With the change of external condition,Au elements enrich in contact position with surrounding rocks.This mineralization period enrichs uniform but low grade gold.In the late period,Au elements reveal more active because of hydrothermal superimposed and atmospheric precipitation,those ore hydrothermal gathered sustainably in fractured altered zones and carbonate fissures and subsided to orebody in the end.The 3 ore bodies extend along the strike.The research area exist mang ore occurrences from Wusuwuai anomaly area in west to Alake lack in east and show a well metallogenetic potentiality in trending direction.