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- W2378088391 abstract "Zonation of major ore-forming elements transiting from Cu-Au and Cu-Mo to Pb-Zn-Cu-Fe and Pb-Zn from south to north has been shown in the Gangdese-Nyainqentanglha metallogenic belt,Tibet. However,little attention has been given to the reason of this zonation. This paper presents the Pb isotopic data of typical deposits from the metallogenic belt,based on the metallogenic chronology and tectonic evolution,and discusses the reasons of this zonation from the aspect of the sources of ore-forming materials. This study indicates that there are differences in sources of ore-forming materials from south to north in the metallogenic belt. The Pb isotope composition of Cu-Au deposits in the south belt has mantle Pb isotopic characteristics (average value 207Pb/204Pb=15.490,208Pb/204Pb=38.016),which reflects that the ore-forming materials were derived from the metasomatic mantle wedge during the process of subduction. The Pb isotope composition of Pb-Zn deposits in the north belt is similar to the basement gneiss of the Nyainqentanglha Group (average value 207Pb/204Pb=15.698,208Pb/204Pb=39.158),indicating that the ore-forming materials originated from the basement gneiss (upper crust). The Pb isotopic characteristics of Pb-Zn-Cu-Fe deposits in the north part of the middle belt suggest a mixing-source model in which the ore-forming materials were delivered by the subducted slab and the Nyainqentanglha basement gneiss during the syn-collisional period; while the ore-forming materials of Cu-Mo deposits in the south part of the middle belt came from the newly-formed lower crust which originated from the material exchanges between the under-plated,partially melt,wedged mantle and the lower crust. In the Jiama Cu polymetallic deposit,the Pb isotopes indicate that the ore-forming materials were partly sourced from the newly-formed lower crust and partly from the volcanic rocks of the Yeba Formation. The differences in the sources of ore-forming materials from south to north in the Gangdese-Nyainqentanglha metallogenic are largely related to the distance effect of plate subduction. Variations in the sources of ore-forming materials caused the metallogenic zonation of the belt." @default.
- W2378088391 created "2016-06-24" @default.
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- W2378088391 date "2010-01-01" @default.
- W2378088391 modified "2023-09-25" @default.
- W2378088391 title "Lead isotope characteristics of ore sulfides from typical deposits in the Gangdese-Nyainqentanglha metallogenic belt:Implications for the zonation of ore-forming elements" @default.
- W2378088391 hasPublicationYear "2010" @default.
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