张莹华;凌文黎;吴慧;张亚男;丁晓英;崔滔;杜远生;雷志远;翁申富;

• 1:中国地质大学地质过程与矿产资源国家重点实验室
• 2:中国地质大学地球科学学院
• 3:中国地质大学构造与油气资源教育部重点实验室
• 4:中国地质大学资源学院

摘要(Abstract)：

黔北务川-正安-道真铝土矿带是我国铝土矿重要的成矿带之一。矿床中发育有4种典型的矿石类型:致密状、碎屑状、豆鲕状和土状。通过对不同类型矿石及矿体下伏高Al黏土岩和志留系韩家店组泥质岩的系统元素地球化学研究,采用元素质量平衡的示踪方法,对矿床的成因进行了探讨。研究表明,成矿作用发生于开阔海岸环境、与多频次海进-海退循环对陆缘古风化剖面的侵蚀作用有关;海进-还原过程导致了古风化剖面中部大量黄铁矿等硫化物的形成,而随后的海退-氧化过程产生高硫酸介质水溶液,使得杂质元素大量移出和铝土矿化发生;强酸溶液带出的大量元素随环境向pH值中性化和氧逸度下降条件的演化,以化学沉淀形式形成了杂质元素含量相对较高的致密状矿石,而海进-海退循环对碎屑状-豆鲕状矿石的多期次改造,导致了土状矿石的形成。

关键词(KeyWords)： 黔北;铝土矿;矿石类型;地球化学;成因

Abstract:

Keywords:

基金项目(Foundation): 贵州省地勘基金项目“贵州务正道地区铝土矿基础地质与成矿规律研究”

作者(Author): 张莹华;凌文黎;吴慧;张亚男;丁晓英;崔滔;杜远生;雷志远;翁申富;

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