Thermal history of the giant Qulong Cu-Mo deposit, Gangdese metallogenic belt, Tibet: constraints on magmatic-hydrothermal evolution and exhumation

Zhao, Junxing, Qin, Kezhang, Xiao, Bo, McInnes, Brent, Li, Guangming, Evans, Noreen, Cao, Mingjian, and Li, Jinxiang (2016) Thermal history of the giant Qulong Cu-Mo deposit, Gangdese metallogenic belt, Tibet: constraints on magmatic-hydrothermal evolution and exhumation. Gondwana Research, 36. pp. 390-409.

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Abstract

complete thermal history for the Qulong porphyry Cu-Mo deposit, Tibet is presented. Zircon U-Pb geochronology indicates that the mineralization at Qulong resulted from brecciation-veining events associated with the emplacement of a series of intermediate-felsic intrusions. Combined with previously published ages, our results reveal a whole intrusive history of the Qulong composite pluton. Causative porphyries were emplaced at similar to 16.0 Ma as revealed by Ar-40-Ar-39 dating of hydrothermal biotite (15.7 +/- 0.2 Ma) and sericite (15.7 +/- 02 Ma). Zircon and apatite (U-Th)/He (ZHe and AHe) dating of Qulong revealed that both followed similar, monotonic thermal trajectories from 900 degrees C (U-Pb ages: 17.5-15.9 Ma) to 200 degrees C (ZHe: 15.7-14.0 Ma), and that the causative porphyries experienced faster cooling at a maximum rate of greater than 200 degrees C/myr. The Qulong deposit was exhumed between 13.6 Ma and 12.4 Ma (AHe) at an estimated rate of 0.16-0.24 mm/y, which is consistent with previous estimates for other Gangdese Miocene porphyry deposits. Our AHe thermochronology results suggest that neither the Gangdese thrust system, nor the Yadong-Gulu graben affected or accelerated exhumation at the Qulong deposit.

Item ID: 46384
Item Type: Article (Research - C1)
ISSN: 1342-937X
Keywords: thermochronology, U-Pb and Ar-Ar geochronology, cooling-exhumation process, Qulong Cu-Mo deposit, Gangdese
Funders: National Natural Science Foundation of China (NSFC), China Postdoctoral Science Foundation (CPDSF), China Studies Centre (CSC), Chinese Academy of Sciences (CAS)
Projects and Grants: NSFC grant No.41402080, CPDSF General Financial Grant 2014M550836, CSC 2014 State Scholarship, CAS Grant number SDB03010303
Date Deposited: 09 Nov 2016 07:41
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840102 Copper Ore Exploration @ 60%
97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 40%
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