投稿时间：2013-09-19
修订日期：2014-06-30
网络发布日期：2014-09-15
中文摘要:近年来在黔东北地区先后发现了多个中-大型沉积型钒矿床，它们均赋存在寒武系下统九门冲组（∈1jm）下部的黑色碳质泥岩中。为了从地球化学方面深入探讨该类钒矿床中含矿岩系的沉积环境以及矿床成因类别，选用电感耦合等离子体质谱（ICP-MS）法对钒矿体及其上、下地层的样品进行了主量、微量和稀土元素测试，采用层序地层学方法对典型钒矿床的含矿岩系地层进行剖析，充分利用地球化学元素对环境的敏感特性探索了含矿岩系形成的氧化还原条件和矿床成因。结果表明，含矿岩系主要为海相深（浅）水陆棚相沉积物，因沉积过程中沉积相的多次演变，形成了现在具有一定差异的岩性组合。同时，因地球化学场的不断变化，沉积物中主量、微量和稀土元素的含量呈现了特有的分布规律。文章首次从地球化学方面揭示了该区含矿岩系及钒矿层均是还原环境下的产物，钒矿床以正常海相沉积成因为主，仅与生物作用有一定关系，受热水影响并不明显。这对钒矿床的成矿预测以及实现更大找矿突破，具有一定意义。
Abstract:Lots of medium and large sedimentary vanadium deposits have been discovered in northeastern Guizhou in recent years, which are inescapably hosted in black carbonaceous mudstone of lower Jiumenchong Formation (∈1jm)of Lower Cambrian. In order to investigate the sedimentary environment of ore-bearing rock series and genesis of this kind of vanadium deposits, the authors adopted ICP-MS method to analyze the major elements, trace elements and REE in the vanadium orebody and its overlying and underlying strata, employed the sequence stratigraphy method to make stratigraphic analysis of the ore-bearing rock series in typical vanadium deposits, and fully utilized geochemical elements to probe into the oxidation-reduction conditions for the formation of the ore-bearing rock series and genesis of the deposits. The results show that the ore-bearing rock series comprise mainly marine deep (shallow) water continental shelf facies sediments, which owing to repeated evolution of sedimentary facies during the sedimentation process, have evolved into the present somewhat differential lithologic association. In addition, due to the continuous variation of the geochemical field, the major elements, trace elements and REE concentrations in the sediments exhibit unique distribution regularity. It is revealed for the first time that the ore-bearing rock series and vanadium ores are both products of reduction environment, and vanadium deposits are mainly of normal marine sedimentary origin, which had a certain relationship to biological action but were not obviously affected by hydrothermal solution. The results achieved by the authors not only improve the theoretical research level for vanadium deposits of this area but also have some practical significance for further metallogenic prediction and ore-prospecting breakthrough.
文章编号：
中图分类号：P618.61
文献标志码：
基金项目:本文为贵州省地质矿产勘查开发局“黔东北地区钒矿成矿规律与成矿预测研究”科研项目（编号：200906）资助的成果
引用文本：
舒多友,侯兵德,张命桥,谢兴友.2014.黔东北地区钒矿床地球化学特征及成因研究[J].矿床地质,33(4):857~869SHU DuoYou,HOU BingDe,ZHANG MingQiao,XIE XingYou.2014.Geochemistry and genesis of vanadium deposits in northeastern Guizhou[J].Mineral Deposits33(4):857~869
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