贵州务- 正- 道地区铝土矿含矿岩系中三稀元素赋存状态、富集机理及资源潜力
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本文为国家十二五科技支撑计划重点项目(编号 BAB201104B04)、贵州省基础性公益性项目(编号 黔国土资发\[2010\]120号)和贵州省科技计划项目(编号 黔科合J字\[2014\]2166)联合资助成果。


Occurrence state, enrichment mechanism and resource potential of rare earth,rare metal and rare- scattered elements in ore- bearing rocks in the Wuchuan- Zheng’an- Daozhen bauxite deposit, Guizhou Province
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    摘要:

    黔北务- 正- 道地区铝土矿含矿岩系为下二叠统大竹园组,与下伏志留系下统韩家店组或上石炭统黄龙组及上覆中二叠统梁山组均呈假整合接触,古沉积环境主要为浅湖相,矿床成因属古风化壳沉积型。勘查实践及研究表明:①含铝岩系的各类岩石、矿石中均富含Li、Ga、Sc、REE等三稀元素,在空间分布及不同矿石中含量变化大,相差1~3个数量级。Li在研究区东、西两侧含量相对高,常富集于含矿岩系上部及矿体中致密块状、豆鲕状矿石中;Ga在研究区北侧及含矿岩系中部较富集,Sc在道真沙坝—平木山一带富集程度高,在含矿岩系中含量变化小;REE相对富集于南部、显著富集于含矿岩系的下部。②含矿岩系形成于古赤道附近气候温湿、开放的氧化环境,铝矿物及高岭石、蒙脱石等富铝黏土矿物丰富,促进Li、Ga、Sc 和REE等三稀元素以离子吸附态形式随铝土矿脱硅、去铁、降硫的成矿过程同迁移、同富集;同时由于Li、Ga、Sc、REE等三稀元素与Al、Zr、Ti、Nb、Ta、Hf、Ti、Cr、Th、U等亲石元素离子半径相近,地球化学性质相似,在铝土矿成矿过程中可能部分以类质同象形式赋存。③次生淋滤改造作用及环境pH变化,是促进独立稀土矿物形成及REE在含矿岩系底部富集的重要因素,含矿岩系下部的富稀土层中应有大量稀土以独立矿物存在(特别是∑REE>800×10-6的地段);古沉积环境、成岩成矿期后的地形地貌及构造运动影响约束了Li、Ga、Sc和REE的不均匀分布。④以含铝岩系为评价对象,研究区Li、Ga、Sc资源潜力及潜在经济价值巨大。

    Abstract:

    The ore- bearing rock series of bauxite deposit in the Wuchuan- Zheng’an- Daozhen (WZD) area in northern Guizhou consists of lower Permian Dazhuyuan Formation, underlying lower Silurian Hanjiadian Formation or upper Carboniferous Huanglong Formation, and overlying middle Permian Liangshan Formation, three of which are in discordant contact. The paleosedimentary environment was mainly shallow lacustrine facies and the genesis of the deposit belongs to the sedimentary type of ancient weathering crust. Exploration and research show: (1) All the Al- bearing rock series are rich in Li, Ga, Sc, REE, etc., and vary greatly in spatial distribution and contents of different ores by 1~3 orders of magnitude. Lithium content is relatively high in the east and west sides of the study area. Li is concentrated in the upper part of the ore- bearing rock series and orebodies in massive and oolitic shapes. Ga is relatively enriched in the north of the study area and ore- bearing rock series. Sc is highly enriched in the Daozhenshaba- Pingmushan area and has little changes in content. REEs are relatively concentrated in the south and significantly in the lower part of ore- bearing rock series. (2) The ore- bearing rock series formed near the ancient equator in an open oxidized environment with warm and humid climate. Al- bearing minerals and Al- rich clay minerals (kaolinite and smectite) are abundant, promoting the migration and enrichment of Li, Ga, Sc and REE in the form of ion adsorption along with the mineralization process of desiliconization, iron removal and sulfur reduction of bauxite. At the same time, Li, Ga, Sc, REE and other rare elements have similar ionic radius and geochemical properties as the lithotropic elements (Al, Zr, Ti, Nb, Ta, Hf, Ti, Cr, Th, U), and isomorphism may occur partially in the process of bauxite mineralization. (3) Secondary leaching modification and environmental pH changing are important factors to promote the formation of independent rare earth minerals and the enrichment of REEs at the bottom of ore- bearing rock series. A large amount of rare earth layers may occur at the bottom of ore- bearing rock series as independent minerals (especially in the section of REE>800×10-6). The uneven distribution of Li, Ga, Sc and REEs were restricted by paleosedimentary environment, topography and geomorphology and tectonic movement after diagenesis and mineralization. (4) With Al- bearing rock series as the evaluation object, this study suggests that Li, Ga and Sc in the study area are of great resource potential and huge economic value.

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金中国,刘玲,黄智龙,刘辰生,郑明泓,谷静,邹林,王林.2019.贵州务- 正- 道地区铝土矿含矿岩系中三稀元素赋存状态、富集机理及资源潜力[J].地质学报,93(11):2847-2861.
JIN Zhongguo, LIU Ling, HUANG Zhilong, LIU Chensheng, ZHENG Minghong, GU Jin, ZOU Lin, WANG Lin.2019. Occurrence state, enrichment mechanism and resource potential of rare earth, rare metal and rare- scattered elements in ore- bearing rocks in the Wuchuan- Zheng’an- Daozhen bauxite deposit, Guizhou Province[J]. Acta Geologica Sinica,93(11):2847-2861.

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  • 收稿日期:2019-02-28
  • 最后修改日期:2019-06-23
  • 录用日期:2019-06-27
  • 在线发布日期: 2019-08-22
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