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Geoscience ›› 2021, Vol. 35 ›› Issue (03): 608-624.DOI: 10.19657/j.geoscience.1000-8527.2021.03.03

• Geochemistry • Previous Articles     Next Articles

A Novelty Method of REE Parameter Diagrams: A Case Study of Petrogenesis of Bairendaba-Weilasituo Dioritoids in Inner Mongolia

ZHAO Baoju1,2(), YAN Kai3, XIAO Rongge1()   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
    2. NFC (Shenyang) Metallurgical Machinery Co., LTD, Shenyang, Liaoning 110027, China
    3. China National Geological Exploration Center of Building Materials Industry, Beijing 100035, China
  • Received:2021-02-10 Revised:2021-04-15 Online:2021-06-23 Published:2021-06-24
  • Contact: XIAO Rongge

Abstract:

REE parameter diagrams are important tracers for geochemical and geological studies which show potential for the rapid determination of petrogenesis and magma source. By using REE and SiO2, LREE and LREE/HREE, δEu and LREE/HREE diagrams of dioritoids, we investigate the correlation among REE parameters taking the Bairendaba-Weilasituo dioritoids as an example. Through field petrological observation and whole-rock geochemical data, new REE parameter diagrams and REE R-type cluster analysis, this paper studied the petrogenesis and magma source. The results show that the Bairendaba-Weilasituo dioritoids have high SiO2, Na2O, MgO, and Al2O3 contents, and belong to the calc-alkaline series, indicating the mixing source of magma from both the mantle and the lower crust. The high-REE values of the Bairendaba-Weilasituo dioritoids respectively show negative correlation and positive correlation between LREE/HREE-REE and δEu-LREE/HREE, and show obviously negative Eu anomaly. They are enriched in Rb, Th, U, and K, and depleted in Nb, Ta, Sr, P, and Ti, whereas the low-REE values show absolutely contrary characteristics. We concluded that this suite of calc-alkaline dioritoids were originated from the mantle substance dominated by hybrid crust-mantle mixing magma associated with an active continental margin. The developed method can be used for estimating petrogenesis and magma source in Bairendaba-Weilasituo calc-alkaline dioritoids refe-rence materials. This empirical method shows great potential for the rapid determination of petrogenesis and magma source in large batches of samples commonly analyzed for mineral exploration and REE geochemistry studies.

Key words: REE parameter diagrams, REE geochemistry, dioritoids, Bairendaba-Weilasituo, Inner Mongolia

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