摘要
自然界中常见的电气石族矿物为黑电气石 锂电气石、黑电气石 镁电气石、镁电气石 钙镁电气石类质同象系列的成员。黑电气石 锂电气石类质同象系列的成员主要出现于分异型花岗伟晶岩脉中 ,随着伟晶岩成岩过程交代作用的发展 ,该系列由黑电气石向锂电气石方向演化。黑电气石 镁电气石、镁电气石 钙镁电气石类质同象系列的成员产于去硅花岗伟晶岩脉中 ,或产于区域变质岩中 ,在后者中电气石矿物种属取决于区域变质作用前的原岩成分。
According to the features of chemical compositions, members of isomorphic system for tourmaline group mineral in nature can be commonly divided into three series: shorlite-elbaite, shorlite-dravite and dravite-urite. The members of isomorphic system for shorlite-elbaite can be mainly found at the vein of differential granitic pegmatite. With the development of metasomatism in diagenetic process of pegmatite, it is changed from shorlite to elbaite. The members of isomorphic system of shorlite-dravite and dravite-urite are formed in desilicated granitic pegmatite, or occurred in regional metamorphic rocks in which the varieties of tourmaline depend to a large extent on the different chemical compositions of rocks before the regional metamorphism.
出处
《宝石和宝石学杂志》
CAS
2001年第4期11-14,共4页
Journal of Gems & Gemmology
