【摘要】 乌伦古富碱花岗岩带由南东至北西岩性变化为：二长花岗岩—钾长花岗岩—碱性花岗岩．其中碱性花岗岩为典型的Ａ型花岗岩。碱性花岗岩中的长石为条纹长石，暗色矿物为钠铁门石或含锰镁质钠铁门石及霓石。碱性花岗岩形成年龄为３２０Ｍａ，阿尔泰造山作用在中石炭早期之前即已结束。更多还原

【Abstract】 The Wulungu high-alkaline granite belt rocks are a dmellite-moyite-alkali-granite from SE to NW. The latter is considered as A-type granite. The feldspar in A-type granite is perthite, the dark alkali-minerals in which are arfvedsonite or manganese-bearing magnesia- arfvedsoniteand aegirine. The age of alkali- granite is 320 Ma. Therefore, the paper proposesthat Altay orogenesis ended before the early stage of middle Carboniferousperiod.更多还原