Discussion The Geological Characteristics And Genesis Of Scheelite Of Nanwenhe Mining In Malipo County, Yunnan Province

Scheelite deposit of the Yunnan malipo Nanwenhe is a super large Mining Area found in recent years, is located in south west to malipo. Which is stratoid and occurs in Proterozoic regional metamorphic rock formation.The geological environment of this area is more complicated, so predecessors to the genetic type of ore deposit still hold a big controversy. Based on the thorough mining review detailed petrographic analysis precise geochemical test and chronology study. this article systematically summarizes the type of scheelite ore-bearing rocks, the type of regional metamorphic rocks, metamorphic grade which are related to scheelite, and systematically summarizes the types of scheelite type rock mineral produce order, the metamorphic grade of metamorphic rocks, etc, and tested geochemistry characteristic of the sample.Through the study of the regional metamorphic rocks, which are widely distributed in the area of the marble the schist as ore skarn of surrounding rock and its protolith is arenaceous rock and sandstone. Different from containing scheelite skarn original rocks and has the characteristics of calcareous rock.The study of scheelite ore has shown that the main ore-bearing rocks of scheelite deposit contain skarn and greisens. According to symbiotic relationship and the skarn mineral assemblage, the skarn type scheelite mineralization process is divided into three Period of times five phases:(1) Skarn stage, it is divided into stages of skarn and degradation of alteration;(2) Greisen period,divided into silicide stage of early and late stages of mica;(3) Quartz sulfide stage, it is the quartz sulfide phase,and the scheelite mainly formed in the skarn stage after degradation altered stages. By observed two rocks have quartz sulfide phase, is formed in the late stage, and all along the fissure filling in early minerals. Speculation scheelite mainly formed in the stages of the degradation of alteration and silicide.After research found that the mining area of greisen type scheelite mineralization age at about 102 Ma of the early cretaceous, and with the project team personnel results contain scheelite skarn formed in late Jurassic, dating to around 155±0.96 Ma. So the paper can be concluded that the two types of scheelite is not the same time the product of magmatic activity, is the early yanshan magma melt assimilation calcareous rock(speculation has the composition of Marine sediments) bedding into regional metamorphic rocks, which are growing in a crack in the.