摘要
The Aksug deposit,located in Altay-Sayan region of Russia,is one of the largest porphyry Cu-Mo deposits in SouthernSiberia.The ore-bearing porphyries of the Aksug porphyry Cu-Mo system were formed in post-collisional environment.Geochemicallythey belong to calk-alkaline and high K-calk-alkaline series.Rocks are characterized by enrichment of LILE and depletion of HSFE andHREE,showing the importance of subduction-related components in magma generation.Large plutonic intrusions that host porphyrysystems have been formed during collision.The origin of porphyritic rocks is dominantly the mantle with lower crustal contribution.Themainly economically important Cu-Mo mineralization is closely related to a porphyry series in time and space,being emplaced towardsthe end of magmatic activity.Though the emplacement of plutonic and ore-bearing porphyry complexes took place in differentgeodynamic environments,both complexes are characterized by certain similarity in geochemical composition,alkalinity,trace elementcontent,Sr isotopic composition.This fact evidently indicates a common deep-seated magmatic source(at the lower crust-uppermantle level).Low initial ^(87)Sr/^(86)St,sulfur isotopic characteristics and presence of PGE-Co-Ni mineralization in associated pyrite-chalcopyrite ores suggest that mantle source of chalcophile elements was of high importance in porphyry Cu-Mo mineralization of theAksug deposit.
The Aksug deposit, located in Altay-Sayan region of Russia, is one of the largest porphyry Cu-Mo deposits in Southern Siberia. The ore-beating porphyries of the Aksug porphyry Cu-Mo system were formed in post-collisional environment. Geochemically they belong to talk-alkaline and high K-talk-alkaline series. Rocks are characterized by enrichment of LILE and depletion of HSFE and HREE, showing the importance of subduction-related components in magma generation. Large plutonic intrusions that host porphyry systems have been formed during collision. The origin of porphyritic rocks is dominantly the mantle with lower crustal contribution. The mainly economically important Cu-Mo mineralization is closely related to a porphyry series in time and space, being emplaced towards the end of magmatic activity. Though the emplacement of plutonic and ore-bearing porphyry complexes took place in different geodynamic environments, both complexes are characterized by certain similarity in geochemical composition, alkalinity, trace element content, Sr isotopic composition. This fact evidently indicates a common deep-seated magmatic source （at the lower crust - upper mantle level）. Low initial ^87Sr/^86Sr, sulfur isotopic characteristics and presence of PGE-Co-Ni mineralization in associated pyriteehalcopyrite ores suggest that mantle source of chalcophile elements was of high importance in porphyry Cu-Mo mineralization of the Aksug deposit.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第12期2657-2668,共12页
Acta Petrologica Sinica
基金
Russian Foundation for Basic Research(grant 06-05-64254)
China National Science and Technology Supporting Program(2006BAB07B08)
