Petrogenesis and mineralization of the Hulu Ni-Cu sulphide deposit in Xinjiang, NW China: Constraints from Sr-Nd isotopic and PGE compositions

Show simple item record Tang, D. Qin, K. Su, B. Sakyi, P.A. Mao, Y. Xue, S. 2018-11-02T08:57:30Z 2018-11-02T08:57:30Z 2014
dc.identifier.other Pages 711-733
dc.description.abstract The Permian Hulu intrusion is one of several sulphide-bearing Permian mafic-ultramafic intrusions in the eastern part of the eastern Tianshan located at the southern margin of the Central Asian Orogenic Belt (CAOB) in Xinjiang, NW China. The intrusion is composed of lherzolite, olivine websterite, gabbro, and gabbro-diorite. Disseminated and net-textured Ni-Cu sulphide ores are located at the bottom of the lopolith complex. Negative Zr, Hf, Nb, and Ta anomalies, whole-rock εNd(t) values of +5.7 to +8.8, and variable (Th/Nb)PM values (from 1.06 to 8.13) suggest that the source of the Hulu complexes is depleted mantle metasomatized by subducted slab-derived fluid and/or melt (~5% global subducted sediment and 15% slab fluid) that has experienced approximately 3% lower crustal and 10% upper crustal contamination. The Hulu intrusion is characterized by low PGE abundances i.e. 0.03-1.08 ppb Ir, 0.04-0.69 ppb Ru, 0.02-2.15 ppb Rh, 0.30-48.71 ppb Pt, and 0.21-344 ppb Pd. Our calculations indicate that if the Pd, Os, Ir, and Cu contents of the primary magma were 2.1 ppb, 0.03 ppb, 0.05 ppb, and 200 ppm, respectively, a variable R-factor between 200 and 1600 with residual magma that had experienced 0.01% early-sulphide segregation can explain the variation in Pd, Os, and Ir contents of sulphide-poor and disseminated sulphide samples of the Hulu deposit. Basaltic magma fractionation and assimilation and/or contamination of sulphur-bearing crustal materials might have triggered sulphur saturation to form Cu-Ni sulphide ores. Tarim basaltic PGE contents cannot be used as the mineralized parent magma for the Hulu intrusion because of the differing evolutionary trends of the Ni/Pd and Cu/Ir values. However, similar Cu/Ni and Pd/Ir values in Tarim basalts and Hulu Cu-Ni sulphide ores, as well as the same early sulphide segregation process, show that certain genetic relationships between them and magma sources are probably similar to each other. © 2014 Taylor & Francis. en_US
dc.language.iso en en_US
dc.publisher International Geology Review en_US
dc.subject crustal contamination en_US
dc.subject early sulphide segregation en_US
dc.subject Eastern Tianshan en_US
dc.subject Hulu magmatic sulphide deposit en_US
dc.subject platinum-group elements en_US
dc.title Petrogenesis and mineralization of the Hulu Ni-Cu sulphide deposit in Xinjiang, NW China: Constraints from Sr-Nd isotopic and PGE compositions en_US
dc.type Article en_US

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