U-Pb geochronology and geochemistry of the Dashibao Basalts in the Songpan-Ganzi Terrane, SW China, with implications for the age of Emeishan volcanism

作者： J.-W. Zi , W.-M. Fan , Y.-J. Wang , P. A. Cawood , T.-P. Peng

DOI: 10.2475/09.2010.11

关键词:

摘要: Permian marine basalts (the Dashibao Formation) in the Songpan-Ganzi Terrane to west of Yangtze Block, SW China, yield a SHRIMP zircon U-Pb weighted mean age 263 ± 2 Ma. The are characterized by high TiO2 contents (1.73-4.65 wt. %) and Ti/Y ratios with 577, OIB-like rare earth element (REE) incompatible patterns. Geochemical variation within basalt succession allows division into two groups; Group 1 an alkaline composition is distinguished higher P2O5 contents, along Sm/Yb than underlying that consists predominantly tholeiitic lavas. Both groups possess weakly moderately positive eNd(t) values (0.82 5.28), but show relatively depleted signatures (most >2.5) when compared their counterparts (eNd(t)

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U-Pb geochronology and geochemistry of the Dashibao Basalts in the Songpan-Ganzi Terrane, SW China, with implications for the age of Emeishan volcanism

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U-Pb geochronology and geochemistry of the Dashibao Basalts in the Songpan-Ganzi Terrane, SW China, with implications for the age of Emeishan volcanism

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