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- W2375970840 abstract "Tianyu mafic-ultramafic intrusions are located in the south of the Shaquanzi deep-seated fault. Shaquanzi fault is the boundary between the Central Tianshan Massif and Jueluotage tectonic belt. It covers an area of 0. 056km~2 in shape of dyke pitched to the north. The intrusions consist of gabbro, pyroxenite, olivine pyroxenite, pyroxene peridotite and peridotite. Olivine pyroxenite, pyroxene peridotite and peridotite are the main host rocks for the Cu-Ni ores. Major-element contents of Tianyu complex show tholeiitic evolution trend and m/f values range from 1. 44 to 3. 61 with 2. 25 on average, falling into the range of ferrous-ultramafic rocks. Similar LREE-rich pattern and negative or no Eu anomaly indicate that Tianyu complex have the same magma source. Trace elements show LILE-rich and HFSE-depleted pattern. The depletion of Nb、Ta implies the contamination of continental material. Nb/Hf, Ce/Pb, Nb/ U, La/Sm, Th/Nb values suggest the contamination of upper crust during upward of magma. Zircon LA-ICP-MS U-Pb dates yield 290. 2 ±3.4Ma which is consistent with the age of other mafic-ultramafic complex in East Tianshan. Uniform Lu/Hf values and the ( Hf/ ~(177) Hf)_i reveal that the characteristics of source are simple. The ( ~(176)Hf/~(177) Hf)_i are in the range of 0.282625～0.282770 with corresponding e_(Hf) (t) values of 1.10～6.06. Lu-Hf single-stage modal ages (t_(DMI)) vary from 674. 0 to 884. 7 Ma, mean age (799 Ma) is older than U-Pb age. These characteristics indicate that the parental magma derived from depleted mantle or had been contaminated by crustal material. These geochemical and chronological characteristics also constrain the southern subduction of Paleo-Asia Ocean in Paleozoic." @default.
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- W2375970840 date "2009-01-01" @default.
- W2375970840 modified "2023-09-26" @default.
- W2375970840 title "Lithological, chronological and geochemical characteristics of Tianyu Cu-Ni deposit: Constraints on source and genesis of mafic-ultramafic intrusions in eastern Xinjiang." @default.
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