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Geoscience ›› 2011, Vol. 25 ›› Issue (2): 211-218.

• Water Resource and Environment • Previous Articles     Next Articles

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

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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