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地质学报  2012 

白云鄂博矿床研究若干问题的探讨

, PP. 683-686

Keywords: 白云鄂博式矿床,成矿时代,碱性杂岩,基底杂岩

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Abstract:

白云鄂博巨型稀土-铌-铁矿床是与火成碳酸岩(即H?8)有关的矿床。在碳酸岩岩浆阶段,在其蚀变围岩(霓长岩)中以及晚期的热液阶段都有稀土、铌和铁等的富集。因此,白云鄂博矿床不是单一矿床类型,其涵盖了稀土-铌-铁碳酸岩岩浆型矿床、稀土-铌-铁交代蚀变岩型和热液型矿床,这种复合类型的矿床是十分罕见的,可称之为白云鄂博式矿床。根据已发表的年代数据,白云鄂博大规模碳酸岩的形成时代和伴随的稀土矿化的高峰期在1.3~1.4Ga。加里东构造热事件对本区的影响广泛和强烈,不仅有广泛发育的大型褶皱、冲断层和韧性剪切作用,并伴有广泛的流体交代作用和局部的热液活动,某些稀土矿物的同位素体系受到重置,表现为其Sm-Nd年龄和Th-Pb年龄的不一致。本区的碱性岩在基底杂岩中即有出露,随后在白云鄂博群中和1.3~1.4Ga白云鄂博碳酸岩形成时皆有产出。目前所获资料表明,至少1.3~1.4Ga的碱性杂岩在成因上与碳酸岩有密切的联系。本区基底杂岩显示了白云鄂博地区在2.0Ga左右曾经有一个弧地质体,该区在2.0~1.9Ga间经历了从被动大陆边缘到活动大陆边缘增生碰撞的一个完整的造山过程。

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