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对个旧锡矿的玄武岩和花岗岩进行了载锡能力的高温高压实验岩石学研究。结果表明:无论是花岗质还是玄武质岩浆,Sn4+都可以大量置换岩浆中的Si4+,形成富锡岩浆;个旧花岗质岩浆载锡最多可达约36%,而个旧玄武质岩浆载锡亦可达14.9%以上;当富锡的花岗质岩浆冷却时,岩浆将会出溶呈液滴状的锡的硫化物,表明花岗岩与锡矿有着直接的成因联系;而富锡玄武质岩浆由于快速淬火,且形成温度较高,不利于形成锡的矿物,但是所形成的玄武岩仍具备形成锡矿源层的条件。因此,锡矿的成矿地质体并不单一,花岗质与玄武质岩浆均可能成矿,关键在于岩浆在其形成或运移过程中,是否从源区或围岩之中获得大量的锡。
The basalt and granite in Gejiu tin deposit were subjected to high temperature and high pressure experimental petrology of tin-bearing capacity. The results show that Sn4 + can replace abundant Si4 + in the magma to produce tin-rich magma in both granitic and basaltic magmas, and up to about 36% in Gejiu granitic magma. Up to 14.9%. When the Fu-rich granitic magma cooled, the magma will be dissolved in droplets of tin sulfide, indicating that the granite and tin have a direct genetic relationship; and rich tin-rich basalt magma due to Rapid quenching, and the formation of higher temperatures, is not conducive to the formation of tin minerals, but the formation of basalts still have the conditions to form the source layer of tin. Therefore, the ore-forming geological body of tin is not single, and both granitoids and basaltic magmas may be mineralized. The key point is whether or not magma obtained a large amount of tin from the source area or the surrounding rock during its formation or migration .