【正文】
s rhyolitic porphyry contains light rare earth element is more, when rock weathering enrichment. 4 Deposit formed by superficial leaching Refers to the original rock of active substances, after weathering leaching was taken to a nearby groundwater enrichment of the rock formation of the formation of this deposit not only decided by the geochemical nature of oreforming elements, also need to have clear geochemical barrier, mainly is the diving movement of the block and the physical and chemical environment of rapid deposition of the uranium ore, copper is a mon deposit. (1) Illuviation uranium original rock weathering, the dispersion of uranium pounds was taken out to the favorable sedimentary is a base element, when containing 4 price of uranium in uranium ore bee 6 price of uranium oxide, it is easy to be leaching bring, met with the precipitation of uranium in migration agent, it turns into the sediments of uranium deposits of time and space distribution is very wide, can divide again glutenite of uranium deposits and coal, or bituminous rock uranium deposits in the two former Colorado plateau of vanadium uranium deposit in the United States, the most famous is the reductant, and the latter is due to the coal asphalt promoted the diving in the concentration and mineralization of uranium pounds. 8 (2) Copper in the red layer, are widely distributed, copper and uranium symbiosis, often also has a separate causes, this kind of deposit with syngeic sedimentary and leaching deposit into the copper ore of copper oxide and oxygen salt (carbonate, etc.), is dispersed native sulfur after oxidation, migration, accumulation of near the phreatic surface. 。s guangxi pingguo bauxite is primary bauxite by the weathering of the Permian collapsing. (3) Type laterite nickel ore called silicate mineral deposit, posed of ultrabasic rock in the tertiary, quaternary or living with tropical and subtropical serpentinite weathering the ultrabasic rock weathering, with such quality as mixed with nickel in olivine and pyroxene into the serpentine, serpentine again after the deposition, nickel analysis, namely into the solution, from top to bottom weathering crust, with secondary nickel minerals and enrichment of nickel minerals to settle and form 7 new caledonia in the south Pacific (French) silicate nickel deposit, 39。s central plateau has this type of ore type of bauxite deposit is mainly limestone weathering products, known as terra rossa type bauxite, are formed after LvShi limestone weathering iron oxide and clay, measures were taken to karst depressions with a bauxite。s surface development type, linear deposits along the rock broken zone and along the contact surfaces of the two kinds of rock contact type by weat