Significance of adakites in petrogenesis of early Silurian magmatism at the Yudai copper deposit in the Kalatag district, NW China

Lei Chen, Jing Bin Wang, Leon Bagas, Xiang Bin Wu, Hai Yang Zou, Hui Qiong Zhang, Yan Sun, Xiao Qiang Lv, Xiao Hua Deng

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    13 Citations (Scopus)

    Abstract

    Yudai is a newly discovered copper deposit associated with a porphyritic quartz diorite, in the Kalatag district of the eastern Tianshan, China. SHRIMP U-Pb dating of zircons from the diorite yielded an age of 432 ± 3 Ma. The diorite is peraluminous (ASI = 0.98–1.10), calc-alkaline to tholeiitic with high Al2O3 of 16.6–17.7 wt% and Mg# of 57.4–67.4. Trace element characteristics of the diorite show it is enriched in Ba, K and Sr, and depleted in Nb, Ta, Ti, with a positive Eu anomaly and high Sr/Y and La/Yb ratios. This diorite has positive εNd(t) values ranging from 6.2 to 8.4 with low initial 87Sr/86Sr ratios of 0.704336 to 0.704450. These geochemical and isotopic characteristics indicate that the adakite-like diorite, associated with the copper mineralization, was emplaced in an island arc setting and resulted from partial melting of subducted oceanic plate in a mantle wedge.

    Original languageEnglish
    Pages (from-to)780-794
    Number of pages15
    JournalOre Geology Reviews
    Volume91
    DOIs
    Publication statusPublished - 1 Dec 2017

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