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2022 Vol. 49, No. 4
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Article navigation > Geology in China > 2022 > 49(4): 1224-1235
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LI Shanpo, QIAO Xinxin, CHEN Junkui, ZHENG Kai, PAN Xiaona, WU Xiangke, ZHANG Shaobo, ZHANG Rongzhen, GAO Chuanbao1. 2022. Metallogenic mechanism of alkalinesyenite in Dazhuang Nb-REE deposit, Fangcheng, Henan Province[J]. Geology in China, 49(4): 1224-1235. doi: 10.12029/gc20220413
Citation: LI Shanpo, QIAO Xinxin, CHEN Junkui, ZHENG Kai, PAN Xiaona, WU Xiangke, ZHANG Shaobo, ZHANG Rongzhen, GAO Chuanbao1. 2022. Metallogenic mechanism of alkalinesyenite in Dazhuang Nb-REE deposit, Fangcheng, Henan Province[J]. Geology in China, 49(4): 1224-1235. doi: 10.12029/gc20220413
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Metallogenic mechanism of alkalinesyenite in Dazhuang Nb-REE deposit, Fangcheng, Henan Province

  • 1.

    Henan Institute of Geological Survey/Henan key Laboratory of Metallogenic Geological Processes and Resource Utilization, Zhengzhou 450001, Henan, China

  • 2.

    Geological Environmental Monitoring Institute of Henan Province/Key Laboratory of Geohazard Prevention of Henan Province, Zhengzhou 450016, Henan, China

  • 3.

    Scientific Academy of Land and Resources of Henan, Zhengzhou 450003, Henan, China

  • 4.

    Guangxi Geological Survey, Nanning 530023, Guangxi, China

    • Fund Project: Supported by geological exploration fund project of Henan Province(No.2017-22) and science and technology key project of Department of Natural Resources of Henan Province(No.2020-165-3)
More Information
  • Author Bio: LI Shanpo, male, born in 1982, master, senior engineer, engaged in the study of mineral deposits; E-mail: lsp533@163.com
  • Corresponding author: CHEN Junkui, male, born in 1976, master, senior engineer, engaged in geological and mineral resource survey and research; E-mail: 609225520@qq.com 
Received Date:  10 March 2020
Revised Date:  15 July 2022
Publish Date:  25 August 2022
    Abstract

  • This paper is the result of mineral exploration engineering.

     Objective

    Dazhuang deposit is a newly discovered medium-sized Nb-REE deposit (Nb2O3=16245t; Associated TRE2O3=30147 t)in Fangcheng, Henan Province and its ore body occurs within alkaline syenite.

     Methods

    In this paper, the authors compared the differences between ore-bearing and barren alkaline syenites in terms of petrology, petrography and geochemistry based on detailed field observation.

     Results

    The results show that both ore-bearing and barren alkaline syenites belong to typical A-type granite which is rich in alkaline and aluminium and there is no significant differences in alkali metal contents between them, whereas the ratios of (Na2O+K2O) /CaO, FeO*/MgO, K2O/MgO are obviously different. Moreover, the ore-bearing alkaline syenite has high contents of high field strength elements such as Nb, Ta, Ce, U, Th, Zr and Y, but is depleted in Ba, Sr, P and Eu. The barren alkaline syenite displays high content of large ion lithophile elements of Rb and some high field strength elements such as Nb, Ta, Y and is depleted in Ba, U, Sr, P, Ti and heavy rare earth elements however, its depleted degree is lower than that of ore-bearing alkaline syenite.

     Conclusions

    The comprehensive analysis implies that the ore-bearing alkaline syenite in Dazhuang deposit was not the product generated by hydrothermal alteration (albitization) of barren alkaline syenite, but formed from the same magmatic system at different evolution stages. The fractionation degree of the ore-bearing alkaline syenite is obviously higher than that of barren syenite and the enrichment of rare elements and rare earth elements in Fangcheng Dazhuang deposit is closely related to the high evolution process of A-type magma. These results may provide some petrological evidences for the REE prospecting in Fangcheng district.
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