The rare metal and rare earth mineral resources in the eastern section of the north margin of North China Plate are distributed mainly in the plate margin or tectonic junction of different ages,controlled by regional major faults,such as Tancheng-Lujiang fault belt and Suolun-Xilamulun-Changchun-Yanji fault zone,and experienced mainly three stages of tectono-magmatic events including Lyuliangian,Indosinian and Yanshanian.The rare metal-rare earth minerals in the area are closely related to Mesoproterozoic and Mesozoic magmatic rocks.Over 10 rare metal-rare earth deposits or ore occurrences have been found so far,distributed mainly in Liaoning Province and eastern Inner Mongolia,dominated by metallogenesis of alkaline granite-alkali rock type,followed by pegmatite type.The mineralization of rare metal-rare earth elements is related to alkaline magmatism.The geochronology of ore-forming rock mass shows that the mineralization can be divided into three stages:Yanshanian(120-140 Ma),Indosinian(200-230 Ma)and Lyuliangian(2500-2510 Ma).The enrichment and mineralization process of rare metal-rare earth elements is closely related to the advanced evolution of alkaline magma.Under the action of water and volatiles,the magma experienced strong fractional crystallization,resulting in migration and accumulation of ore-forming elements.With the change of mineralization conditions such as temperature and pressure,the ore-bearing fluids were concentrated and mineralized in the late stage of magmatism with the crystallization of major rock-forming minerals.
关键词
稀有金属/稀土元素/矿床成因/成矿作用/岩浆作用/华北板块
Key words
rare metal/rare earth element/genesis of deposit/mineralization/magmatism/North China Plate
维普
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