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广西大厂电气石的成分与成因初探
A Preliminary Study on the Composition and Origin of Tourmalines in Dachang, Guangx
  
中文关键词:电气石 岩浆热液 锡石硫化物矿床 广西大厂
英文关键词:tourmaline  magnatic hydrothermal solution  cassiterite-sulfide deposit Dachang
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作者单位
王登红  
陈毓川  
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中文摘要:
      镁电气石不一定只产于喷气岩或喷气矿床,在花岗岩中也有产出。大厂花岗岩及其有关锡多金属矿床中的电气石属铁镁系列,产于岩体中者富Fe贫Mg,产于矿体中者贫Fe富Mg,并有随远离源区Mg含量增高的趋势,与国内外同类矿床电气石成分的演化规律相一致。锡石硫化物矿体中电气石富镁的原因是多方面的,其中Mg、Fe两元素亲硫性的明显差别可能是导致Fe富集于黄铁矿等硫化物中、而Mg富集于电气石等蚀变矿物内的重要原因。
英文摘要:
      Tourmalines in granites and granite-related tin-polymetallic ore deposits of Dachang,Guangxi , belong to schorl-dravite series . Tourmalines from granites contain highΣFeO (14.79%—16.07%) but low MgO (0.92%—2.74%), Whereas tourmalines from orebodies have high MgO (7.71%—10.50%) but lowΣFeO content (0.19%—4.50%). It is obvious that the abundance of MgO becomes increasingly higher with the distance from granite. Such compositional and evolutional features are in accordance with the general law of granitic tourmalines, but different from features of exhalative tourmalines. In Dachang mine, tourmalines can be found in various horizons of the Changpo-Tongkeng deposit and also in different kinds of altered wall rocks, such as Middle Devonian argillutite and Upper Devonian siliceous shale, thick and thin banded limestones, lens-like limestones and marl, making up at least twenty-three kinds of tourmaline-bearing mineral assemblages. In the lattice of tourmaline crystal, Mg and Fe occupy the same Y site; in consequence, when Fe is dominant in hydrothermal solution, it is more easy to form schorl, but when Mg is dominant, dravite is more easy to form. There are many reasons for the high MgO content of tourmaline in the Changpo-Tongkeng deposit:(1) the granites in Dachang are relatively high in Mg compared with other tin-related granites;(2) the deposit is located far away from granite;(3)iron in hydrothermal solution tends to be incor- porated into such sulfides as pyrite and pyrrhotite, and magnesium incorporated into metasomatic minerals like dravite;(4)Mg derived from wall rocks may be another material source for the formation of dravite.
王登红,陈毓川,1996,广西大厂电气石的成分与成因初探[J].岩石矿物学杂志,15(3):280~287.
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