Abstract：The Xifeng phosphate deposit is an important component of the Ediacaran Doushantuo phosphate deposits in Guizhou Province,Southwest China,which is characterized by a thick ore layer,a high quality,a developed fault system,and rich and unique stromatolites. We reveal that the Xifeng phosphorite rocks were formed in the foreshore and shoreface environments under the combined conditions of hot water,biological and normal seawater sedimentation. The Doushantuo Formation underwent a palaeoclimate shift from a warm and humid climate to a dry and hot climate,and to a hot and humid climate,related to transgression,regression,and transgression,respectively. Therefore,the metallogenic process of the Xifeng phosphate deposits also underwent three stages of mineralization related to the transgression,regression and transgression again. The lower ore layer formed during the early transgression stage of the Doushantuo Period,whereas the upper ore layer formed in the subsequent regression and transgression stages. The two ore layers are separated by dolomite on the margin of the palaeo-continent of central Guizhou. When the second transgression crossed the foreshore position of the first transgression,only the upper ore layer formed,namely the Kaiyang and Xifeng phosphorus deposits. The Wengfu phosphate deposit has two layers of ore bodies,corresponding to the foreshore and shoreface zone that experienced three stages of mineralization. The location elevation of Wengfu phosphate deposit during mineralization is significantly lower than the Xifeng phosphate deposit,and the Xifeng phosphate deposit was slightly lower than the Kaiyang phosphate deposit. During mineralization prediction and prospecting exploration of the phosphate deposits in the Doushantuo Period,the dynamic foreshore and shoreface environment in central Guizhou and its vicinity,similar to the Xifeng phosphorus deposit,is the prospecting target area. Meanwhile,using the characteristics of two intersecting ore layers formed by “three-stage mineralization”,mineralization prediction surrounding the known deposits,mineralized points and foreshore and shoreface zones can be efficiently performed.
CAO Shengtao,XIE Hong,ZHENG Lulin et al. Study on metallogenic environment,mineralization and metallogenic model of the Xifeng phosphate deposits in central Guizhou Province,China[J]. JOPC, 2022, 24(4): 785-801.
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