The Explanation of the Metallogeny about Qianlishan Tungsten-tin by the Theory of Small Magmatic Intrusion Mineralization

Qianlishan magmatic intrusion is located on Chenzhou Hunan,and composes 3 periods of granite and late stage dykes,as known as pseudoporphyritic biotite granite,medium-grain biotite granite,short-grain biotite granite and with granite-porphyry and diabase dyke intruding when magma was almost concretionary.The geochemistry data show that early stage granite and the late stage granite-porphyry share the similar component but differ in source region,therefore they are considered two independent magmatic activities.Shizhuyuan,forms large-scale deposits as small magmatic intrusion,arises extensive study of "large deposit in small intrusion" among the pundit around the world.The emphasis of this paper is to analyzing the migration processes of the elements which are dissolved in fluid through the transmagmatic fluid theory.The fluid within F contributes to extracting tungsten-tin metal,and increasing the saturation of the it by rising the valence of metal ion.On the other hand,the enrichment of F could to reduce the crystallizing point of magma,and promote the migration of elements.The fluid is supplemented by impulse magmatic activities repeatedly,and yet blocke its diffusion by concretionary pseudoporphyritic biotite granite that exist in the terminal of the migration of mineralizing material as a shield layer,which plays a vital role in the mineralization.