Geochronology, Geochemistry and Petrogenesis of Diabase Dyke Swarms in East Tianshan, Xinjiang, NW China
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    Abstract:

    Diabase dyke swarms are widespread in the East Tianshan and Beishan regions. LA-ICP-MS zircon U-Pb ages of these diabase vary from 305 Ma to 278 Ma, showing that these dykes were formed during Late Carboniferous-Early Permian magmatism. All diabase samples are subalkali calc-alkali, characterized by slight LREE and LILEs enrichment, and weak negative Ti, Nb and Ta anomalies. The diabase samples have positive εNd(t) values (>+3), high Sr isotopic compositions (initial 87Sr/86Sr values=0.7030-0.7097), and large variation of Pb isotopic compositions, indicating they were derived from a deplete mantle source. Regional geology and geochemistry evidences indicate that these diabase dyke swarms were generated in a lithosphere extensional setting and had the same magma sources. Initial magmas may be a mixture of depleted asthenosphere mantle and enriched lithospheric mantle during rapid magma ascending.

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ZHANG Zuoheng, *, CHAI Fengmei, WANG Tuanhua, CHENG Yanbo, XU Lingang, YUAN Shunda.2012. Geochronology, Geochemistry and Petrogenesis of Diabase Dyke Swarms in East Tianshan, Xinjiang, NW China[J]. Acta Geologica Sinica(),86(6):1500-1514

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History
  • Received:September 28,2012
  • Revised:October 28,2012
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