| 刘长龄,覃志安.论中国岩溶铝土矿的成因与生物和有机质的成矿作用[J].地质找矿论丛,1999,(4):24-28 |
| 论中国岩溶铝土矿的成因与生物和有机质的成矿作用 |
| ON ORIGIN OF KARST BAUXITE IN CHINA AND BIO-ORGANIC METALLOGENESIS |
| 投稿时间：1999-09-12 |
| DOI：10.6053/j.issn.1001-1412.1999.4. 004 |
| 中文关键词: 岩溶铝土矿 成因 生物 有机质 |
| 英文关键词:karst bauxite origin organism organic matter |
| 基金项目: |
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| 摘要点击次数: 1192 |
| 全文下载次数: 1955 |
| 中文摘要: |
| 中国铝土矿以石炭纪岩溶型硬水铝石为主,占世界同类型矿床的90%以上。其形成条件因长期处于湿热的古热带地区,铝硅酸盐岩石(包括基底碳酸盐岩石中粘土质与页岩夹层)经强烈的风化,特别是生物风化作用产生粘土质、铝凝胶等胶体与细碎屑物质,经水流冲刷并作短程搬运至盆地而成为湖沼沉积、海湾或泻湖沉积。生物和衍生的有机质的成矿作用遍及各个阶段:如早期风化淋滤作用,搬运阶段的护胶作用,沉积水盆中有机物的吸附、分解及净化作用,同生、成岩阶段在还原环境下形成硬水铝石与黄铁矿,以及后期表生阶段有机质与黄铁矿的氧化作用使矿石去硅去硫、铁呈粗糙状与多孔状而铝质富集。 |
| 英文摘要: |
| Bauxie in China is dominated by Carboniferous Karst diaspore type which account for >90% of this type in the world.In ancient hot and wet tropic zone, strong weathering of silicate rock (including clay and shale intracalasts) generated clayey material and alumina gel which were washed by water and shortly transported,then deposited to form bauxite in ajacent basin,such as lake, marsh, bay or lagoon. Organism and the derived materials played roles in different stages of the bauxite metallogenesis, such as transportation, organic material protected gel, the absorption, resolution and purification of large amount of orgrnic matter in water of sedimentary basin in which syngenetic and diagenetic stages were under reduction and diaspore and pyrite formed. In the supergenetic stage the oxidation of organic matter and pyrite made ore lose Si, S and Fe, become rough and porous ores rich in alumina. |
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