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在1:20万区域地质调查过程中,我们首次在四川省西部地区,发现了黄玉花岗岩脉。该区出露地层主要是三叠纪浅变质砂岩、千枚岩、板岩。上述岩脉分布在印支期云闪正长岩,燕山期班状黑云母花岗岩,组成的复式岩体的内外接触带中,呈脉状成群产出。根据矿物组分和化学成分的不同,可分为钠长石与微斜长石两种类型。 (一) 钠长石型黄玉锂云母钠长石伟晶岩脉:呈近南北向分布于印支一燕山期复式岩体的外接触带
During the 1: 200,000 regional geological survey, we first discovered the topaz granite veins in the western part of Sichuan Province. The exposed strata in this area are mainly Triassic super-metamorphic sandstone, phyllite and slate. The dikes are distributed in the form of veins in the internal and external contact zones of the complex rock mass of Indosinian-Epithermal and Yanshanian chalcular biotite granites. According to the different mineral components and chemical composition, can be divided into albite and slightly plagioclase two types. (A) albite-type topaz-micaceous albite feldspar pegmatite veins: Near North-South distribution in the Indosinian-Yanshanian complex rock mass outer contact