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- W2620587750 abstract "The Gangdese porphyry Cu-Au belt (South Tibet, China) in the eastern Tethyan metallogenic belt hosts many deposits, which formed in subduction and collisional settings. Several porphyry Cu-Au deposits have been discovered in the Xietongmen region, including a large porphyry Cu-Au deposit at Xiongcun. However, the formation mechanism for the Xietongmen Cu-Au deposits and their igneous host rocks remain enigmatic. This study reports whole-rock major- and trace-element compositions, Sr-Nd isotopes, in situ zircon Hf- and plagioclase Sr-isotope compositions, and major- and trace-element compositions of amphiboles to constrain the magmatic emplacement and evolution related to the porphyry Cu-Au mineralisation in the Xietongmen region. New zircon U-Pb ages show that the Xietongmen diorites formed at 185 Ma, consistent with the age of Cu-Au mineralisation. The Xietongmen diorites are characterised by enrichment in LILEs and LREE, and depletion in HFSEs. These features suggest that the diorites were produced by arc magmatism in an oceanic-slab subduction environment. In situ isotopic compositions exhibit radiogenic εHf(t) (+9.8 to +14.4) and low initial 87Sr/86Sr values (0.7039–0.7043); whole-rock results show positive εNd(t) (+5.26 to +5.31) and unradiogenic initial 87Sr/86Sr values (0.7042–0.7043). These isotopic results are similar to coeval mantle-derived hornblende gabbros and the Sangri volcanic rocks in the Gangdese belt. Amphibole clots in the Xietongmen diorites have higher MgO and Ni contents, with AlT > 1.0, Mg# > 0.5, Ni > 143 ppm, and REE patterns different from those of magmatic and idiomorphic amphiboles in the host diorites, suggesting that the clots are xenocrysts. All the petrological and geochemical evidence suggests that the Xietongmen mineralised diorites were derived from a Jurassic hydrous mantle wedge induced by slab dehydration. These magmas contain higher contents of water and other volatiles and have higher oxidation states. These conditions favored the transfer of metals (such as Cu, Au) to the upper crust, and then formed the Jurassic porphyry Cu-Au deposits." @default.
- W2620587750 created "2017-06-09" @default.
- W2620587750 creator A5001902912 @default.
- W2620587750 creator A5023180240 @default.
- W2620587750 creator A5026111794 @default.
- W2620587750 creator A5030046993 @default.
- W2620587750 creator A5049907847 @default.
- W2620587750 creator A5050734459 @default.
- W2620587750 creator A5068703836 @default.
- W2620587750 creator A5070812231 @default.
- W2620587750 creator A5071241615 @default.
- W2620587750 creator A5075818270 @default.
- W2620587750 date "2017-11-01" @default.
- W2620587750 modified "2023-10-17" @default.
- W2620587750 title "In situ elemental and isotopic study of diorite intrusions: Implication for Jurassic arc magmatism and porphyry Cu-Au mineralisation in southern Tibet" @default.
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