Structural, lithological, and geochemical constraints on the dynamic magma plumbing system of the Jinchuan Nia??Cu sulfide deposit, NW China

Xie-Yan Song, Leonid Danyushevsky, Reid Keays, Lie-Meng Chen, Yu-Shan Wang, Yu-Long Tan, Jia-Fei Xiao

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    Eastern and western portions of the Jinchuan ultramafic intrusion have previously been interpreted as dismembered segments of a single elongate intrusion by late faults. However, the different stratigraphic sequences of the two portions indicate that they are originally two separate intrusions, referred to as Eastern and Western intrusions in this study. The Eastern intrusion is characterized by a concentric distribution of rock types with a core of sulfide dunite enveloped by lherzolite, whereas the Western intrusion is composed of the Upper and Lower units, interpreted as magmatic mega cycles with regular variations in lithology and chemistry. In the Western intrusion, the Upper unit consists of fine-grained dunite, lherzolite, and pyroxenite from its base to its top.
    Original languageEnglish
    Pages (from-to)277 - 297
    Number of pages21
    JournalMineralium Deposita
    Issue number3
    Publication statusPublished - 2012

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