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- W2377307989 abstract "The Baguamiao gold deposit is the only superlarge gold deposit in the Qinling orogen.It was once considered to be a sediment-hosted finely disseminated gold deposit(Carlin type).But the latest study shows that it is characterized by gold-bearing quartz veins with vis ible and coarse-grained gold.Its spatial lo-cation and distribution of orebodies are controlled by the Erlihe-Changgou-Baguamiao-Kongguangou brittle-ductile shear zone and the rocks in the deposit show distinct features of shear deformation.During brittle-ductile shearing,NW-trending,rootless,corrugated,bedding-parallel quartz veins were formed.The Au-bearing quartz veins ,which have an Ar-Ar plateau age of 232.58±1.59Ma and an Ar-Ar isochron age of 222.14±3.45Ma ,are the product of Indosinian brittle-ductile shearing-dynamic metamorphism and differenti-ation.In the Early Yanshanian,the ductile shear zone was uplifted to the shallow level and reworked by brittle deformation,thus enabling the NE-trending Au-bearing quartz veins to be formed under the action of hydrothermal fluids.Such Au-bearing quartz veins are rich ores and contain1×10 -6 ～4×10 -6 Au.The strong brittle-ductile shear deformation records that the quartz dislocation and differential stress(△σ)had an evolutionary trend of becoming small from the early to late phases.The△σvalues tended to decrease toward the end for the shearing event and brittle deformation event.Mineralization took place during the metastable stages of tectonic activity in the periods of alternate occurrence of two pulsations of tectonic events.The“stress pump ”or “shock pump ”formed in the stress periods was the dynamic mechanism for the formation of the Baguamiao superlarge gold deposit." @default.
- W2377307989 created "2016-06-24" @default.
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- W2377307989 date "2002-01-01" @default.
- W2377307989 modified "2023-09-24" @default.
- W2377307989 title "Baguamiao superlarge gold deposit in the Qinling orogen:the characteristics of its control by the brittle-ductile shear zone and dynamic mechanism for ore-forming structure" @default.
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