首页|Petrogenesis,oxidation state and volatile content of Dongga tonalite in the Gangdese belt,Xizang:Implication for porphyry Cu mineralization
Petrogenesis,oxidation state and volatile content of Dongga tonalite in the Gangdese belt,Xizang:Implication for porphyry Cu mineralization
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Petrogenesis,oxidation state and volatile content of Dongga tonalite in the Gangdese belt,Xizang:Implication for porphyry Cu mineralization
The Gangdese belt in Xizang has experienced both Jurassic subduction and Cenozoic continental colli-sion processes,making it a globally renowned region for magmatic rocks and porphyry copper deposits.Numerous Jurassic intrusions have been identified in the belt.Apart from the quartz diorite porphyry in the large Xietongmen deposit,the Cu mineralization potential of other Jurassic intrusions in this belt remains unclear.This study presents zircon U-Pb dating and trace elements,apatite major and trace elements as well as published whole-rock geochemi-cal and isotopic data of the Dongga tonalite in the central part of the Gangdese belt,aiming to reveal the petrogen-esis,oxidation state,volatile content,and Cu mineraliza-tion potential of this intrusion.The Dongga tonalite has a zircon U-Pb age of 179.4±0.9 Ma.It exhibits high whole-rock V/Sc values(8.76-14.6),relatively low apatite CeN/CeN*ratios(1.04-1.28),elevated zircon(Eu/Eu*)N values(an average of 0.44),high Ce4+/Ce3+values(205-1896),and high ΔFMQ values(1.3-3.7),collectively suggesting a high magmatic oxygen fugacity.The Dongga tonalite fea-tures amphibole phenocrysts,relatively high whole-rock Sr/Y ratios(20.3-58.9),and lower zircon Ti temperatures(502-740 ℃),reflecting a high magmatic water content.Estimation of magmatic sulfur content(0.002-0.024 wt％)based on apatite SO3 contents indicates an enriched magma sulfur content.Combined with previous studies and the col-lected Sr-Nd-Hf isotopes,the Dongga tonalite is derived from juvenile lower crust related with subduction of the Neo-Tethys oceanic slab.When compared with Xietongmen ore-bearing porphyries,the Dongga tonalite exhibits remarkable similarities with the Xietongmen ore-bearing porphyries in terms of magma source,tectonic background,magmatic redox state,and volatile components,which indicates that the Dongga tonalite has a high porphyry Cu mineralization potential,and therefore,provides important guidance for the future mineralization exploration.
TonaliteZirconApatiteMineralization potentialDongga areaGangdese belt
Liqiang Zhang、Xilian Chen、Shaohao Zou、Deru Xu、Xuena Wang、Hua Wang
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State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China
School of Earth Sciences,East China University of Technology,Nanchang 330013,China
Tonalite Zircon Apatite Mineralization potential Dongga area Gangdese belt
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