Source, evolution and emplacement of Permian Tarim Basalts: evidence from U-Pb dating, Sr-Nd-Pb-Hf isotope systematics and whole rock geochemistry of basalts from the Keping area, Xinjiang Uygur Autonomous region, northwest China

Dayu Zhang, Taofa Zhou, Feng Yuan, Simon Martin Jowitt, Yu Fan, Liu Shuai

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    Abstract

    Permian basalts distribute at least 250,000 km(2), and underlie the southwest Tarim Basin in Xinjiang Uygur Autonomous region, northwest China. This vast accumulation of basalt is the main part of the Tarim Large Igneous Province (LIP). The basaltic units in the Lower Permian Kupukuziman and Kaipaizileike Formations in the Keping area, Tarim Basin; were the best exposure of the Permian basalt sequence in the basin. LA-ICP-MS U-Pb dating of zircon from the basal basaltic unit in the section gives an age of 291.9 +/- 2.2 Ma (MSWD = 0.30, n = 17); this age, combined with previously published geochronological data, indicates that the basalts in the Tarim Basin were emplaced between 292 Ma and 272 Ma, with about 90 of the basalts being emplaced between 292 and 287 Ma. Basalts from the Keping area have high FeOT (10.8-18.6 wt. ), low Mg s (0.26-0.60), and exhibit primitive mantle normalized patterns with positive Pb, P and Ti but negative Zr, Y and Ta anomalies
    Original languageEnglish
    Pages (from-to)175 - 190
    Number of pages16
    JournalJournal of Asian Earth Sciences
    Volume49
    Issue numberSI
    DOIs
    Publication statusPublished - 2012

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