中文摘要：

川西是中国重要的稀有金属矿产资源基地，川西可尔因伟晶岩型稀有金属矿床位于松潘甘孜造山带主体的中心部位，对该造山带的演化过程具有重要的示踪意义。本文对可尔因地区根则岩体中白云母微斜长石伟晶岩脉和党坝白云母钠长石锂辉石伟晶岩脉进行了^40Ar／^39Ar定年研究，其白云母^40Ar／^39Ar坪年龄分别为176．25±0．14Ma和152．43±0．60Ma。结合前人对可尔因岩体的成因认识和K—Ar、Rb—Sr、u—Pb同位素定年结果，推断出在印支晚期燕山早期，该地区经历了多期岩浆演化，且持续了较长的时间，而伟晶岩的稀有金属矿化发生在岩浆活动末期的相对稳定和封闭的环境中。这些地质现象说明，松潘甘孜造山带在经历了印支末期燕山早期的剧烈构造运动后，在150Ma左右进入相对稳定发展的阶段，直至喜马拉雅运动造成地壳急剧隆升，这段稳定时期为各种成矿作用的发生提供了必要条件。

英文摘要：

Western Sichuan is an important area of rare metal resources in China. KeerYin pegrnatite type rare metal ore deposit is located at the center of the Songpan-Garze orogenic zone, stern Sichuan. To study it can trace the evolution of the Songpan-Garze orogenic zone. In this paper, ^40Ar/^39Ar plateau age of 176.25 ± 0. 14 Ma of muscovite from the muscovite-rnicrocline pegrnatite in Genze intrusive rock and the age of 152. 43 ± 0. 60 Ma from Dangba lithium deposit are gotten. Considering the genesis of the granites and published K-At, Rb-Sr, U-Pb isotope ages, it is concluded that in the late of Indosinian epoch and the early of Yanshanian epoch, large scale magrnations happened in Keeryin region, and lasted a long time. But rare metal mineralization took place in steady and close geologic environment in the late of magrnations. These geological phenomena showed that the Songpan-Garze orogenic zone evolved into stable period until the beginning of Himalayan movement. The stable period is ready for ore-forming of many type deposit.