地质找矿论丛

郑辉,葛志超,秦术凯,黄奎,白进春,梁清玲.加纳阿瓦索红土型铝土矿床地球化学特征及成矿作用研究[J].地质找矿论丛,2017,32(2):334-339

加纳阿瓦索红土型铝土矿床地球化学特征及成矿作用研究

Geochemical characteristics and metallogeny of the Awaso lateritic bauxite deposit, Ghana

投稿时间：2017-02-24

DOI：10.6053/j.issn.1001-1412.2017.02.021

中文关键词: 阿瓦索铝土矿矿床地球化学红土型矿床加纳共和国

英文关键词:Awaso bauxite deposit deposit geochemistry lateriticdeposit Ghana

基金项目:

作者	单位
郑辉	四川省冶金地质勘查局六○六大队, 成都 611730
葛志超	四川省冶金地质勘查局六○六大队, 成都 611730
秦术凯	四川省鑫铁矿业有限责任公司, 成都 610041
黄奎	四川省冶金地质勘查局六○六大队, 成都 611730 成都理工大学地球科学学院研究生院, 成都 610059
白进春	四川省冶金地质勘查局六○六大队, 成都 611730 成都理工大学地球科学学院研究生院, 成都 610059
梁清玲	四川省冶金地质勘查局六○六大队, 成都 611730

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中文摘要:

红土型铝土矿是加纳共和国铝土矿资源的主要矿床类型。阿瓦索铝土矿床产于西非克拉通古元古界比理姆岩系（泥板岩类）的表层红土中，是典型的红土型铝土矿。通过分析阿瓦索铝土矿的成矿地质背景、矿体特征以及矿石地球化学元素特征发现，铝土矿石的化学组分以Al₂O₃、SiO₂、TFe₂O₃为主，TiO₂次之，碱金属元素含量极低；风化过程中Zr、Hf、Nb、Ta等微量元素含量稳定；Cr—Ni关系图显示比理姆岩系为铝土矿的矿源岩，三水铝石主要由比理姆岩系中的黏土矿物经过风化淋滤形成，表层铝土矿在后期风化和红土化作用下结构构造发生一定的变化，铁氧化成以赤铁矿为主的铁壳，最终形成一个大型的红土型铝土矿。

英文摘要:

Lateritic bauxite is the main type of bauxite resources in the Republic of Ghana. Awaso bauxite deposit is typical lateritic deposit occurring in surface laterite of Proterozoic Birim rock sequence in the West African craton. Comprehensive analysis of metallogenic background, characteristics of ore body and ore geochemical elements of the Awaso bauxite deposit reveals that the ore constituents are mainly Al₂O₃, SiO₂ and TFe₂O₃ then TiO₂ and basic metal content is very low. Trace element content of Zr, Hf, Nb, Ta etc. is stable in the weathering process. The Cr-Ni diagram indicates that the ore-forming materials were mainly sourced from Birim rock sequence. Gibbsite is derived from weathering and leaching of the clay minerals in Birim rock sequence. Structure of the bauxite at surface was changed by late weathering and lateritization and the hematite-dominated iron oxides crust formed. The laterite bauxite deposit was formed through the long time evolution.

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