Metallogenic and Prospecting Models of Bauxite in Wuchuan-Zheng'an-Daozhen Area, Guizhou Province

Key words: 
• bauxite /
• exploration techniques integrating /
• metallogenic model /
• prospecting mode /
• Wuchuan-Zheng'an-Daozhen area of Guizhou province /
•  /

Abstract: The Wuchuan-Zheng'an-Daozhen Bauxite metallogenic belt, located in the contiguous area of north Guizhou and south Chongqing, is an important bauxite resource area in Guizhou with more than 10 large deposits and 800 million tons reserves discovered. The bauxite occurred in the lower Silurian Hanjiadian formation of clastic rocks or the lower Permian Dazhuyuan Formation above the ancient erosion surface of Carboniferous Huanglong formation of carbonate. The deposits belongs to ancient weathering sedimentary type. Based on previous researchs of ore-forming sources, ore-forming environments, mineralization and ore deposit genesis types, the relationship between regional tectonic evolution and bauxite formation was studied in this paper, to disclosure the geology-geochemistry evolution process of bauxite mineralization combined with special geological features. According to extraction of 1:100 000-1:10 000 remote sensing image features, the series of ore-bearing rocks and adjacent layers, main structure identification, relationship among iron, mud anomaly and the space distribution of the rock series were summarized to establish a remote sensing 3D image model in large scale. Through the application and comparative study of multiple bauxite mining areas by geophysical methods, such as Shallow seismic reflection wave method, high density resistivity method, frequency domain tripole sounding method, audio earth electromagnetic sounding method, high power excitation sounding method, the geophysical prospecting marks of “high, sunken, concave, thick” and typical mine 3D geological and geophysical prospecting prediction model of the bauxite deposit was established. On the study above, the technical method system of bauxite exploration and furtheron the geological, geophysical, geochemical and remote sensing prospecting models may demonstrate guidance to prospect and acquire remarkable prospecting effect through engineering verification, indicating the proposed mining model is suitable and effective in the exploration of bauxite in the study area.