Title: Re-Os Dating for Molybdenite from Qulong Porphyry Copper Deposit in Gangdese Metallogenic Belt,Xizang and Its Metallogenic Significance
Abstract:Qulong deposit located in Gangdese granitoid batholite in the eastern Gangdese metallogenic belt is one of typical porphyry-type copper deposits. High precise dating of Re-Os for molybdenite determine...Qulong deposit located in Gangdese granitoid batholite in the eastern Gangdese metallogenic belt is one of typical porphyry-type copper deposits. High precise dating of Re-Os for molybdenite determined the mineralization age of Qulong copper deposit. The Re-Os model ages for 6 molybdenite samples are from 15. 99 Ma to 16. 74 Ma, with variety less than 1 Ma. According to the best-fit calculation of 6 samples, Qulong deposit yielded a 187Re-187Os isochron age of 16. 41 + 0. 48 Ma(2σ error, MSWD=1. 5) , identical to the Re-Os model ages. Those date of Qulong deposit are consistent with the mineralization ages (14 Ma±) of the porphyry-type copper deposits in Gangdese belt. The date of mineralization age of the porphyry-type copper deposits in Gangdese belt shows that the copper mineralization occurred in the period from 16 Ma to 14 Ma, in a short session with time limit no more than 2 Ma, and implies the speciality of paroxysmal mineralization. The deposits occurred during eruption of potassic lava and east-west extension of the crust in Xizang (Tibet). The geochemistry characteristics of the copper-bearing porphyries and the space-time adhere to potassic lava and to south-north trending extensional structure system indicate that the porphyry-type copper deposits in Gangdese belt are controlled by the evolution of the Himalayan-Tibet collision orogen and tectonomagmatism under the collision belt, which implies the dynamic setting of paroxysmal mineralization of porphyry-type deposits in Gangdese belt.Read More
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: article
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Cited By Count: 42
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