岩浆岩,特别是期中的花岗岩类岩石,不仅分布广泛,而且与绝大多数的金属矿床有着密切的成因联系。在岩浆岩中,仅仅除了超基性岩之外,长石矿物几乎是所有其余岩浆岩个可缺少和唯一主要的矿物成份。尤其是斜长石类,由于它们广泛的并按自已成份的变化(Ca 与 Na 含量比例的变化),而有规律性的出现在酸性到基性岩浆岩中,因而就成了鉴定岩浆岩(包括肉眼和镜下)唯一重要的标志了。所以,在野 Magmatic rocks, especially mid-stage granitic rocks, are not only widely distributed, but also closely related to the vast majority of metal deposits. In the magmatic rocks, except for the ultrabasic rocks, feldspar minerals are virtually the only and insignificant mineral components of all the remaining magmatic rocks. In particular, plagioclase is regularly identified as acidic to basic magmatic rocks due to its wide range of changes in its own composition (a change in the ratio of Ca and Na) Including the naked eye and the mirror) the only important sign up. So, in the wild