Origin of layered gabbroic intrusions and their giant Fe-Ti-V oxide deposits in the Pan-Xi district, Sichuan Province, SW China
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P588.124 P618.31

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    Abstract:

    The Emeishan Large Igneous Province comprises voluminous flood basalts and spatially associated mafie-ultramafic intrusions. In the Pan-Xi region, SW China, a number of gabbroic intrusions are dated at -260 Ma, same as the previous reported ages for the ELIP, and host .some giant Fe-Ti-V oxide deposits. Unlike the oxide deposits in classic layered intrusions, such as the Bushveld Complex, those in the Pan-Xi region occur as layers and/or lenses within the gabbros and are generally concentrated in the lower parts of the intrusions. Available geochemical evidence suggests that the intrusions were formed from highly evolved Fe-Ti-Vrich ferrogabbroic or ferropicritic magmas. The magmas were further enriched in Fe-Ti-V after separation of Si-rich magmas which formed the syenitic intrusions. Ore textures and associated mineral assemblages indicate that the orebodies were formed by late-stage crystallization of V-rich titanomagnetite from oxide liquids. The abundant accessory hydrous phases suggest that addition of fluide from upper crustal rocks might have induced the separation of the immiscible oxide melts and subsequently gave rise to the oxide orebodies.

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周美夫,2005,攀西地区层状辉长岩体及钒钛磁铁矿床的成因[J].岩石矿物学杂志,24(5):381~384. Zhou MeiFu,2005,Origin of layered gabbroic intrusions and their giant Fe-Ti-V oxide deposits in the Pan-Xi district, Sichuan Province, SW China[J]. Acta Petrologica et Mineralogica,24(5):381~384.

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  • Received:August 26,2005
  • Revised:August 26,2005
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