Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (6): 1691-1701.doi: 10.13278/j.cnki.jjuese.201506111

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REE Characteristics and Its Geological Significance of the Bauxite Deposits in Nanchuan-Wulong Area,Chongqing

Zhao Xiaodong1, Hu Changsong2, Ling Xiaoming1, Li Junmin1   

  1. 1. Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, China;
    2. ChongQing Institute of Geological Survey, Chongqing 401100, China
  • Received:2015-03-30 Published:2015-11-26

Abstract:

The composition of REE in ore bearing rocks of Nanchuan-Wulong area indicates that the total amount of REE is high, and the partition modes in the bauxite-bearing horizons and in the underlying Silurian Hanjiadian Formation are quite consistent. This implies a genetic relationship between the bauxite source and Hanjiadian Formation. The values of LREE /HREE are great in the majority samples. It is obvious that the light rare earth elements are strongly enriched; while the heavy rare earth elements are depleted to varied degrees with Eu middle negative anomaly.The content of REE in the ore bearing rocks changed only slightly after deposition. Based on the characteristics of rare earth elements and the related parameters, the environment of bauxite ore bearing rock series and their material sources are deduced as followings: ore bearing rocks were formed mainly in continental facies with some marine sediments; based on Ce, Eu anomalies, acidity of paleo water media was weak; ore bearing rock series were mainly formed in an oxidation environment, which was profitable for the formation of bauxite. Material sources of the ore bearing rock series are diversified; both silty shale of Silurian Hanjiadian Formation and Carboniferous limestone of Huanglong Formation might be the source of material.

Key words: REE, sedimentary environment, material sources, bauxite, Chongqing

CLC Number: 

  • P595

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