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黔北务正道地区下二叠统铝土矿层物源研究:来自碎屑锆石年代学的证据*

DOI: 10.7605/gdlxb.2014.01.019, PP. 19-29

Keywords: 铝土矿,物源,碎屑锆石年代学,下二叠统,黔北

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Abstract:

贵州北部务川—正安—道真地区下二叠统大竹园组沉积型铝土矿层,在不同区域其下伏底板地层分别为下志留统韩家店组碎屑岩及上石炭统黄龙组灰岩,因此对铝土矿层的成矿物质来源一直存疑。对韩家店组薄层砂岩夹层及大竹园组铝土矿层样品的碎屑锆石年代学分析表明,两者的锆石年龄谱呈现出一致性,且该碎屑锆石年龄谱与华夏陆块基底地层具有明显亲缘性。以上结果证明,韩家店组碎屑岩的红土化风化产物为铝土矿层的成矿母质提供了物质来源。而从铝土矿层与黄龙组灰岩的假整合接触关系及钻孔中出现的黄龙组灰岩次生岩溶角砾现象可知,黄龙组灰岩同样为该矿层提供了物源。因此,大竹园组铝土矿层具有多重物源,韩家店组碎屑岩可能为主要物源,而黄龙组灰岩在古喀斯特化过程中不仅为红土物质提供了重要的储存空间,也为成矿母质的积累提供了部分物源。

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