张亚男;张莹华;吴慧;丁晓英;凌文黎;雷志远;翁申富;马倩;杜远生;

• 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:贵州省地质矿产勘查开发局106地质大队

摘要(Abstract)：

铝土矿矿床中普遍含有不同比例的鲕状矿石,但目前对这些鲕粒的成因及其与成矿作用相互关系的了解相对有限。对贵州务正道地区铝土矿矿床中典型鲕状矿石中鲕粒进行了微区原位主量元素电子探针分析(EPMA)和激光剥蚀等离子体质谱(LA-ICP-MS)主量和微量元素分析,并与共存基质的元素组成进行了对比。研究表明,鲕粒的形成时间晚于基质,地表化学风化作用本身并不能导致铝土矿的形成;鲕粒的形成发生于强氧化和高酸度的环境,其成因被解释为在海进过程中在地层中一定的深度条件下形成了以黄铁矿为主的硫化物矿物,随后的海退作用过程导致硫化物蚀变并形成强酸环境,使得成矿元素Al相对于杂质元素(Si、Fe)发生相对富集,且该过程具有多期次振荡重复的特点。铝土矿形成是热带湿热气候条件下周期性海进-海退循环与长期的大陆古隆起区平坦海岸地形相互耦合的结果。

关键词(KeyWords)： 黔北;铝土矿;鲕粒;微区原位分析;地球化学特征;成矿意义

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): 张亚男;张莹华;吴慧;丁晓英;凌文黎;雷志远;翁申富;马倩;杜远生;

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