滇东南锡多金属矿床成因商榷

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滇东的个旧、白牛厂、都花等大型多金属块状硫化物矿床,都曾为大多数人认为是典型的岩浆热液矿床。对硫化物矿物的系统研究发现,一些曾被认为是典型的岩浆热液成因的矿体,实际上是一些海底喷流沉积块状硫化物。因为在这些矿体中我们发现了颇状结构、球状(硫化物)结构、草枣林结构、条带状构造和层纹状构造等。除此之外,在个旧矿区还发现硫化物中有丝状管形虫(TubeWorm),这些管形虫可与现代海底喷流沉积中心附近,如“黑烟囱”或热泉口出现的管形虫相比较.这是一种特征的海底热液喷流沉积生物结构。白牛厂矿区大量的结构构造特征也充分表明其为海底喷流沉积成因。笔者依据一些基础地质方面的新发现,讨论了一些特殊组构的地质意义,总经探讨了岩体、地层和喷流沉积物的微量元素、稀土元素和稳定同位素特征及其意义。对硫化物矿物化学和共生组合的特点、这些矿区锡矿化和银矿化等问题也进行了一些阐述和讨论。花岗岩和喷流流积物中Ce负异常的发现说明了矿区下伏岩体和上理层状硫化物矿体之间的成因联系,即它们是形成海底沉积丘深部和喷出海底的两大部分,同时也表明层状硫化物矿体主要为喷流沉积成因而不是岩浆热液成因。花岗岩浆的侵入作用只是对层状矿体进行了某种改造作用,这种改造作用表? Large polymetallic massive sulphide deposits such as Gejiu, Baigou and Duhua in eastern Yunnan have been considered as typical magmatic hydrothermal deposits for most people. Systematic studies of sulfide minerals found that some of the ore bodies that were previously considered to be typical magmatic hydrothermal origin are actually submarine jet-laden massive sulphides. Because in these ore bodies, we found the quite structure, globular (sulfide) structure, jujube forest structure, banded structure and lamellar structure. In addition, there are also tubeworms of sulphide found in Gejiu mining area, which can be associated with the presence of tubular worms in the vicinity of modern seafloor sedimentary centers such as “black chimneys” or hot springs Compared. This is a characteristic submarine hydrothermal jet deposition biological structure. A large number of structural features of the Bai Niu mining area have also shown that it is the cause of submarine jet deposition. Based on some new discoveries in basic geology, the author discusses the geological significance of some special formations. The authors discuss the characteristics and significance of trace elements, rare earth elements and stable isotopes in rock mass, formation and jet stream sediments. On the characteristics of sulfide mineral chemistry and symbiotic combination, the problems of tin mineralization and silver mineralization in these mining areas are also described and discussed. The discovery of Ce negative anomalies in granite and jet flow sediments illustrates the genetic relationship between the underlying rock mass in the mine and the uplifted layered sulphide orebodies, ie, they are the two major formations forming the seabed sedimentary mound and the seabed Part, but also shows that the layered sulfide orebody is mainly caused by jet deposition instead of magmatic hydrothermal origin. The intrusive effect of granite magma is just a kind of reformation to the layered ore body.
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