PETROGENETIC AND METALLOGENETIC AGES FOR THE PORPHYRY COPPER DEPOSITS IN THE GANGDISE METALLOGENIC BELT IN SOUTHERN TIBET-中国期刊网

摘要 RecentexaminationandassessmentabouttheporphyrycopperdepositsinGangdisemetallogenicbeltinsouthernTibethaverevealedthattheseporphyrycopperdepositsarehighlyprospective.SeveralmethodshavebeenusedfortheisotopicdatingoftheQulong,TinggongandChongjiangporphyrycopperdeposits,whichgivesoutapetrogeneticageof17.58±0.74Ma(single-zircondatingofSHRIMP),ametallogeneticageof15.99±0.32Ma(Re-Osisochrondating)andanalterationagerangingbetween12.00Maand16.5Ma(K-Ardating).Themetallogeneticageisingeneralagreementwiththealterationage.ItcanbeseenthatthepetrogeneticandmetallogeneticagesfortheporphyrycopperdepositsinGangdisemetallogenicbeltarenoticeablylaterthantheageforthecollisionalgraniticintrusioninthisbelt.Theauthorscontendthattheporphyrycopperdepositsinthestudyareawereformedinapost-collisionalextensionaltectonicsetting,andarecloselyrelatedtothedelaminationofthemountainrootsoftheorogenicbeltsandtheupliftingoftheQinghai-TibetPlateau.

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PETROGENETIC AND METALLOGENETIC AGES FOR THE PORPHYRY COPPER DEPOSITS IN THE GANGDISE METALLOGENIC BELT IN SOUTHERN TIBET

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PETROGENETIC AND METALLOGENETIC AGES FOR THE PORPHYRY COPPER DEPOSITS IN THE GANGDISE METALLOGENIC BELT IN SOUTHERN TIBET

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