ISSN 1009-6248CN 61-1149/P 双月刊

主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

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    新疆阿尔金地区黄龙岭锂矿床伟晶岩分带特征与多期构造–岩浆叠加成矿机制

    Zoning Characteristics of Pegmatite and Multi-stage Tectono-Magmatic Superimposed Mineralization Mechanism of Huanglongling Lithium Deposit in Altyn Region, Xinjiang

    • 摘要: 黄龙岭锂矿床是新疆阿尔金地区近年来新发现的超大型伟晶岩型锂矿床,巨大的资源潜力使其迅速成为区域内稀有金属成矿研究的热点。黄龙岭伟晶岩脉具有明显的区域分带及内部结构带,区域分带以白云母花岗岩为中心,向外依次为微斜长石伟晶岩(Ⅰ带)、石英–白云母–钠长石伟晶岩(Ⅱ带)、石英–锂辉石伟晶岩(Ⅲ带)和锂辉石–锂云母–锂电气石伟晶岩(Ⅳ带)。此外,单个脉体的内部结构分带不尽相同,从无分带的全脉矿化(锂辉石)伟晶岩脉到6个内部结构带均发育。通过对区域分带的伟晶岩开展独居石、铌钽铁矿U-Pb测年,厘定出黄龙岭伟晶岩存在①主成矿期(442~436 Ma)、②成岩期(422~419 Ma)、③成岩期(413.3~411.0 Ma)、④次成矿期(401.8~396.9 Ma)等4期成岩成矿作用,推测黄龙岭多期多阶段成岩成矿作用与区域构造–岩浆演化耦合。黄龙岭伟晶岩的区域分带模式及稀有金属演化特征,表明黄龙岭伟晶岩是典型的LCT型伟晶岩,伟晶岩脉复杂的内部结构分带,表明其成矿过程受多期构造–岩浆活动叠加影响,由熔体分离结晶、流体出溶等多种成矿作用耦合叠加形成。

       

      Abstract: The Huanglongling lithium deposit is a newly discovered superlarge pegmatite-type lithium deposit in the Altyn area of Xinjiang in recent years, Owing to its tremendous resource potential, this area has rapidly emerged as a focal point for research on rare-metal metallogenesis within the region.The pegmatite dykes in the Huanglongling deposit exhibit distinct regional zonation and internal textural zoning. Centered on muscovite granite, the regional zoning consists successively of microcline pegmatite (Zone I), quartz-muscovite-albite pegmatite (Zone II), quartz-spodumene pegmatite (Zone III), and spodumene-lepidolite-lithium tourmaline pegmatite (Zone IV) outward.In addition, individual pegmatite dykes show variable internal textural zonation, ranging from fully mineralized spodumene-bearing pegmatite dykes without zoning to those developed with six internal textural zones. Based on U-Pb dating of monazite and columbite-tantalite from the zoned pegmatites, four episodes of magmatism and mineralization have been identified in the Huanglongling pegmatites: ① the main mineralization stage (442–436 Ma), ② a magmatic stage (422–419 Ma), ③ another magmatic stage (413.3–411.0 Ma), ④ the secondary mineralization stage (401.8–396.9 Ma). It is inferred that the multi-stage magmatism and mineralization of the Huanglongling deposit are coupled with regional tectonic-magmatic evolution.The regional zoning pattern and rare metal evolutionary characteristics indicate that the Huanglongling pegmatites belong to typical LCT-type pegmatites. The complex internal textural zonation of pegmatite dykes reveals that the mineralization process was overprinted by multi-phase tectono-magmatic activities, and formed via the combined effects of multiple metallogenic processes including magmatic fractional crystallization and fluid exsolution.

       

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