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    ZHANG Hai, FANG Wei-xuan, Zhang Guishan, GAN Feng-wei, WEI Ning, Guo Yu-qian. Facies sequence reestablishment and metallogenic analysis of Middle Triassic Anisian meta-volcanic rocks in the Kafang ore district, Gejiu, Yunnan[J]. GEOLOGY IN CHINA, 2009, 36(6): 1322-1330.
    Citation: ZHANG Hai, FANG Wei-xuan, Zhang Guishan, GAN Feng-wei, WEI Ning, Guo Yu-qian. Facies sequence reestablishment and metallogenic analysis of Middle Triassic Anisian meta-volcanic rocks in the Kafang ore district, Gejiu, Yunnan[J]. GEOLOGY IN CHINA, 2009, 36(6): 1322-1330.

    Facies sequence reestablishment and metallogenic analysis of Middle Triassic Anisian meta-volcanic rocks in the Kafang ore district, Gejiu, Yunnan

    • Abstract:The Middle Triassic Anisian meta-volcanic rocks in Kafang Member of Gejiu Formation could be restored into a set of alkaline basic-ultrabasic rock assemblages. The restored volcanic and sedimentary lithofacies includes explosive facies, effusive facies, volcanic sedimentary facies, tidal flat facies, late-basin-fluid superimposed facies and skarn facies. It is considered that the vertical facies sequence might be in order of explosive facies→effusive facies→volcanic sedimentary facies→tidal flat facies, belonging to the facies sequence structure and facies assemblage formed in a back-arc rift basin background. Kafang Member is divided into 3 volcanic stages in the study area, which composed a volcanic cycle. The characteristics of the vertical phase sequence indicate multi-stages of volcanic activities and variation of volcanic activities from strong to weak. Late-basin-fluid superimposed facies and skarn facies can be regarded as ore-bearing lithofacies and an ore-prospecting index in future.
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