Reconstruction of quantitative lithofacies palaeogeography of the Sinian Doushantuo Age of phosphorite depositional zone in Kaiyang area,central Guizhou Province
Wang Zepeng1, Zhang Yaguan2, Du Yuansheng2, Chen Guoyong3, Liu Jianzhong1, Xu Yuanyuan2, Tan Daiwei1, Li Lei1, Wang Dafu1, Wu Wenming1
1 Geological Party 105,Guizhou Provincial Bureau of Geology and Mineral Exploration and Development,Guiyang 550018,Guizhou; 2 State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences(Wuhan),Wuhan 430074,Hubei; 3 Science and Technology Information Department,Guizhou Provincial Bureau of Geology and Mineral Exploration and Development,Guiyang 550004,Guizhou;
Abstract：The deposition and mineralization of phosphorite had intimate relationship with the paleogeographic environment of phosphogenesis. This paper first used the single factor analysis and multifactor comprehensive mapping method to analyze and predict the phosphorite deposits in Kaiyang area during Sinian Doushantuo Age. This paper selected the stratum thickness of the Doushantuo Formation and its each lithologic section and the ore grade of phosphorite bed as the single factors to reflect the palaeogeographical pattern of Kaiyang area. Based on these isoline maps of single factors and other factors like lithologic combinations and sedimentary characteristics,the sedimentary environments of metallogenic epoch were clearly recovered and at last the quantitative lithofacies palaeogeographical maps of the Early,Middle and Late Doushantuo Age were compiled. According to the result of reconstruction of quantitative lithofacies palaeogeography, we proposed that Kaiyang area was in seashore environment which was located in north margin of Central Guizhou Old Land,and the topography became higher from north to south and local terrain was rugged. The nearshore areas were targeted as the most advantageous metallogenic belt and the changeful local terrain affected the thickenss and ore grade of phosphorite, and the phosphorite which experienced multi-stages erosion,exposure,leaching and reworking would had higher ore grade. Using quantitative lithofacies palaeogeography can accurately recover the palaeogeographical environment of metallogenic epoch and analyze the sedimentation and mineralization processes,and it has important significance for confirming the controlling factors of phosphorite, constructing mineral prediction model and predicting the spatial location of orebody.
Wang Zepeng,Zhang Yaguan,Du Yuansheng et al. Reconstruction of quantitative lithofacies palaeogeography of the Sinian Doushantuo Age of phosphorite depositional zone in Kaiyang area,central Guizhou Province[J]. JOPC, 2016, 18(3): 399-410.
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