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现代地质 ›› 2011, Vol. 25 ›› Issue (2): 211-218.

• 岩石学 • 上一篇    下一篇

陕西省勉县―略阳地区寒武纪含碳岩系的地球化学特征及其成因

乔耿彪1,杨钟堂1,李智明1,杨晓勇2,蓝翔华2   

  1. 1.中国地质调查局 西安地质矿产研究所,陕西 西安710054;2.中国科学技术大学 地球和空间科学学院,安徽.合肥230026
  • 出版日期:2011-04-25 发布日期:2011-05-13
  • 作者简介:乔耿彪,男,硕士,助理研究员,1979年出生,地质学专业,主要从事固体矿产勘查和岩石地球化学研究工作。Email:qgb408@163。com。
  • 基金资助:

    中国地质调查局地质调查项目(1212010010503);中央地质勘查基金试点项目(2007611007)。

Genesis and Geochemical Characteristics of the Cambrian Carbonaceous  Rock Series in Mianxian-Lüeyang Region, Shanxi Province

QIAO  Geng-Biao1,YANG  Zhong-Tang1,LI  Zhi-Ming1,YANG  Xiao-Yong2,LAN  Xiang-Hua2   

  1. 1.Xi an Institute of Geology and Mineral Resources,China Geological Survey,Xi an,Shan xi710054,China;
    2.School of Earth and Space Sciences,University of Sciences and Technology of China,He fei,An hui230026,China
  • Online:2011-04-25 Published:2011-05-13

摘要:

勉县—略阳(勉略)地区寒武纪的含碳岩系与磷、锰矿的形成关系密切,是该区重要的找矿标志。通过对研究区含碳岩系常量元素和微量元素的分析测试认为,含碳岩系总体上富亲石元素和亲铜元素,贫亲铁元素。含碳岩系中P、Mn元素相对富集且富集系数较为接近,反映含碳岩系与本区P、Mn矿的成因具有一定的联系。含碳岩系中较低的MnO/TiO2值、Na-Mg和Sr-Ba投点均反映了近陆源的浅海沉积环境;含碳岩系中较低的Sr/Ba和U/Th值以及Al-Fe-Mn图解均反映出非热水沉积特征;含碳岩系中较高的V/(V+Ni)和δU值反映为缺氧沉积环境。因此,勉略地区寒武系含碳岩系形成于缺氧(还原)沉积环境。

关键词: 含碳岩系, 地球化学, 缺氧环境, 非热水沉积, 勉略地区, 陕西省

Abstract:

The formation of phosphorus and manganese ore deposit was closely related to the Cambrian carbonaceous rock series which were important prospecting criteria in Mianxian-Lüeyang region. Samples of carbonaceous rock series collected from the study area were analyzed for major and trace elements that were used to demonstrate the genesis. P、Mn element were relatively enriched in carbonaceous rock series and enrichment coefficients were similar,suggesting that the carbonaceous rock series were related to the genesis of the Mn and P deposit. Low MnO/TiO2 values, plots in Na-Mg and Sr-Ba diagram indicate sedimentary environment from the land closer to marginal sea of the continental slope. Low Sr/Ba,U/Th values and plots in the Al-Fe-Mn triangle diagram represent a non-hydrothermal sedimentary condition. The high V/(V+Ni) and δU values indicate an anoxic sedimentary environment,so the carbonaceous rock series were deposited in an anoxic oxygen (reduction) sedimentary environment.

Key words: carbonaceous rock series;geochemistry;anoxic environment;non-hydrothermal sediment;Mianxian-Lüeyang region, Shanxi Province

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