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许多地球化学性质特殊的花岗岩产生高热的特征令人十分感兴趣,这不仅是因为它们可能为地热作出贡献,而且因为高热的产生对花岗岩中热液流体的循环及化学成分和同位素系统的改变可能有影响。南非布什维尔德杂岩中就存在这种花岗岩。在扎伊普雷兹(Zaaiplaats),锡矿化作用出现在侵入Rashoop花岗斑岩岩套的莱博瓦花岗岩套的碱性长石花岗岩中。从上接触带向下,碱性长石花岗岩包括边部伟晶岩、细粒Lease花岗岩和粗粒Bobbejaankop花岗岩。
It is of great interest that many geochemically special granites produce high thermal characteristics not only because they may contribute to geothermal activity but also because of the high heat generation that may have altered the circulation and composition of chemical and isotopic systems of hydrothermal fluids in granites influential. This granite is present in the Bushwild complex in South Africa. In Zaaiplaats, tin mineralization occurs in alkaline feldspathic granites of the Leibowa granite encroachment into the Rashoop granite porphyry mantle. Downward from the upper contact belt, alkaline feldspar granites include marginal pegmatites, fine-grained Lease granite and coarse-grained Bobbejaankop granite.