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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第34卷

期数:

2012年第02期

页码:

31-40

栏目:

基础地质与矿产地质

出版日期:

2012-06-20

文章信息/Info

Title:

Geochemical Characteristic of Rare Earth Element in Dazhuyuan Large-scale Bauxite Deposit of Guizhou Province and Its Significance

作者:

李沛刚¹; 王登红²; 雷志远¹; 翁申富¹; 高兰²

1.贵州省地质矿产勘查开发局 106地质大队,贵州 遵义 563000; 2.中国地质科学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室,北京 100037

Author(s):

LI Pei-gang¹;  WANG Deng-hong²;  LEI Zhi-yuan¹;  WENG Shen-fu¹;  GAO Lan²

1. No.106 Geological Team, Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Zunyi 563000, Guizhou, China; 2. Key Laboratory of Metallogeny and Mineral Assessment, Instituteof Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

关键词:

铝土矿;  稀土元素;  地球化学;  矿床成因;  成矿过程;  大竹园矿区;  贵州

Keywords:

bauxite deposit;  rare earth element;  geochemistry;  ore genesis;  metallogenic process;  Dazhuyuan mining area;  Guizhou Province

分类号:

P595

DOI:

-

文献标志码:

A

摘要:

贵州大竹园大型铝土矿是中国近年来取得重要找矿进展的大型铝土矿之一。以采自大竹园矿区栗园向斜不同部位铝土矿、铝土岩和黏土岩的样品为研究对象,分析了这些样品的稀土元素含量(质量分数)特征及空间分布特征,研究了稀土元素含量与铝土矿质量及成矿过程的关系,最后就稀土元素对于成因和环境的指示意义进行了讨论。结果表明:铝土矿、铝土岩和黏土岩稀土元素总含量(不包括Y)分别为107.07×10^-6、185.00×10^-6和246.28×10^-6,依次增高,说明铝土矿的成矿过程是一个稀土元素贫化的过程,也是Eu异常和Ce异常趋于增大的过程,即相对于黏土岩来说,铝土矿具有高Eu异常、Ce异常的特征; 相对于重稀土元素来说,无论是栗园向斜西翼还是东翼,铝土矿轻稀土元素相对富集,且轻稀土元素含量以及La与Yb含量之比均随深度变浅而增加; 单纯利用稀土元素图解不能有效反映成矿物质的来源,但可以大体反映含矿岩系形成于海相或海陆过渡相环境; 大竹园大型铝土矿与黔北其他铝土矿一样,总体上属于沉积型,可能与古喀斯特化过程、古风化过程有关。

Abstract:

Dazhuyuan large-scale bauxite deposit is one of the most important deposits discovered in China recently. Based on the bauxite, allite and claystone samples collected from different positions of Liyuan Syncline in Dazhuyuan mining area, characteristics of rare earth element(REE)contents(mass fractions)and space distribution of the samples were analyzed, relationships of REE to bauxite quality and metallogenic process were explained, and the significances of REE contents to genesis and setting were discussed. The results showed that REE contents of bauxite, allite and claystone, which were 107.07×10^-6, 185.00×10^-6 and 246.28×10^-6 without Y content, increased one by one, so the metallogenic process of bauxite consisted with the leaching of REE while Eu anomaly and Ce anomaly increased; compared with claystone, characteristics of bauxite were higher Eu anomaly and Ce anomaly; compared with heavy rare earth element(HREE), light rare earth element(LREE)of bauxite relatively enriched whether in the west or in the east of Liyuan Syncline, and LREE contents and the ratios of La and Yb contents increased with the decrease of depth; REE diagram was unsufficient to discriminate the source of metallogenic material, but generally showed that mineral-bearing system formed in marine facies or transitional facies setting; Dazhuyuan large-scale bauxite deposit, which was the same with other bauxite deposits in North Guizhou, generally belonged to sedimentary, and was related to paleo-karstification and ancient weathering process.

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备注/Memo

备注/Memo:

收稿日期:2011-07-22
基金项目:贵州省地质矿产勘查开发局项目; 中国地质调查局项目(1212010633903)
作者简介:李沛刚(1967-),男,贵州务川人,高级工程师,E-mail:lipeigang106@126.com。

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更新日期/Last Update: 2012-06-20