~(40)Ar/~(39)Ar Ages of the Keeryin Pegmatite Type Rare Metal Deposit, Western Sichuan, and Its Tectonic Significances
Анотація
Western Sichuan is an important area of rare metal resources in China. Keeryin pegmatite type rare metal ore deposit is located at the center of the Songpan-Garze orogenic zone, western 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-microcline pegmatite 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-Ar, Rb-Sr, U-Pb isotope ages, it is concluded that in the late of Indosinian epoch and the early of Yanshanian epoch, large scale magmations 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 magmations. 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.
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