摘要
通过对偃龙地区铝土矿成矿的古地理环境特征、含矿岩系的岩相学特征、岩石矿物特征、成矿元素富集特征的研究,分析了晚石炭世本溪组铝土矿风化成矿作用的三个阶段脱硅富铝的动态变化过程,进而探讨了本区晚石炭世风化作用条件下的铝土矿成矿过程。研究结果认为,在风化作用为主的铝土矿成矿过程中,含矿母岩首先生成黏土矿物,然后当岩石中Al_(2)O_(3)含量接近35%时,开始生成以三水铝石为主的最初铝土矿,最后铝土矿在盖层覆盖下,在一定的温度压力条件下三水铝石转化为一水硬铝石,并最终形成“煤-黏土-铝土-铁质黏土”这种本溪组铝土矿系的典型结构。
From the study of the paleogeographic environment characteristics,petrographic characteristics of the ore-bearing strata,rock mineral characteristics and enrichment characteristics of ore-forming elements of the bauxite mineralization in the Yanlong area,the paper has analyzed the dynamic process of desilication and aluminum enrichment during the three stages of bauxite mineralization in the weathering process within the Late Carboniferous Benxi Formation and further has also discussed the Late Carboniferous bauxite mineralization under the weathering condition in this area.During the bauxite mineralization mainly controlled by the weathering process,the ore-bearing host rock firstly form clay minerals,and then when the content of Al_(2)O_(3) in the rocks reaches up to 35%,the initial bauxite with gibbsite as the main component begins to form.Finally,under the cover of the overlayed strata,the gibbsite transforms into diaspore under certain temperature and pressure condition.The typical structure of Benxi Formation bauxite deposit series is eventually formed,which includes“coal-clay-bauxite-iron clay”.
作者
陈永才
张清
陈加伟
CHEN Yongcai;ZHANG Qing;CHEN Jiawei(The 4th Geological Exploration Institute,Henan Bureau of Geology and Mineral Exploration and Development,Zhengzhou 450001,Henan,China)
出处
《矿产与地质》
2024年第1期78-86,共9页
Mineral Resources and Geology
基金
河南省省财政地质勘查项目“河南省偃龙煤田深部(洛阳部分)铝(黏)土矿普查”(编号:豫国土资发〔2016〕46号)
河南省国土资源厅国土资源科技项目“偃龙煤田深部铝土矿综合勘查及综合评价研究”(编号:豫国土资发〔2016〕54号)共同资助。
关键词
铝土矿
风化作用
“煤-铝-铁”层序结构
河南偃龙地区
bauxite deposit
weathering function
“coal-aluminium-iron"sequence structure
Yanlong area of Henan
