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- W2384706328 abstract "The Beichagoumen Pb-Zn-Cu-Ag polymetallic deposit,discovered recently by the Bureau of Geology and Mineral Resources and the Geological Survey of Hebei Province and located at the Longhua County,Hebei Province,lies within the northern margin of the North China Craton.The mineralizations span a broad range in style and position relative to porphyritic intrusive or volcanic-subvolcanic centers.In the ore field,mineralizations show a well-defined vertical and lateral zonal distribution with Mo porphyry,roof-breccias ores at their core.removed from the core,the types and metal assemblages of the zoned deposits are varied from Pb-Zn-Cu stockworks ores at the peripheral areas,to Pb-Zn-(Ag) veins,disseminations and hydrothermal breccias at proximal areas,and to epithermal Ag-Cu-Pb-Zn-(Au) or Ag-Mn-Pb-Zn ores at distal areas.Information about the mechanism of ore formation was obtained from field relationships,Mineralized chronology,detailed studies on petrography,geological feature of orebodies and stable isotopic geochemistry,analysis of fluid inclusions for temperature,pressure and chemical compositions.The results imply different types of mineralizations were formed in different time and related to different magmatism.Molybdenum mineralization occurred earliest and was directly related to the late Jurassic quartz monzonite,precipitated from ore-forming fluid with higher temperature,higher salinity and similarity to primary magmatic fluid in H and O isotopic compositions.The sources of Mo were from low crust.Pb-Zn-Cu mineralizations took place later than Mo and were related to the late Jurassic monzonitic granite.The hydrothermal systems that formed Pb-Zn-Cu polymetallic orebodies are inferred to have originated from the mixing of convecting meteoric fluids and magmatic fluids with the temperature less than 400℃ and source of metals from Paleoproterozoic basment reworking.The high-sulfidation or low-sulfidation epithermal Ag polymetallic orebodies were the latest mineralizations in the area,and were developed on the early Cretaceous,related to trachyandesitic rocks and syenitic porphyry in space and time.Epithermal ores reflects same paleohydrologic regimes dominated by lateral fluid flow with temperature less than 300℃." @default.
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- W2384706328 date "2005-01-01" @default.
- W2384706328 modified "2023-09-28" @default.
- W2384706328 title "Metallogenic Processes of Beichagoumen LeadZinc Polymetallic Deposit,North Hebei Province: Constrains from Geological and Geochemical Characteristics" @default.
- W2384706328 hasPublicationYear "2005" @default.
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