Characteristic and prospecting significance of the rare earth elements enrichment in weathering crust of lamproite, southeastern Guizhou
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    Abstract:

    Objectives: Previous studies has been documented that the lamproite and its weathering crust were considered to be difficult to concentrate or mineralize. However, we analyzed the contents of REE in 20 weathered lamproite samples from Longchang, Longshan, Datang, Shibanzhai and Heshangfen in Majiang area, Southeastern Guizhou Province. The results showed that high contents of rare earth elements(REEs) occur in weathering crust of lamproite. In this paper mainly discusses the characteristic of the rare earth elements enrichment and occurrence in the weathering crust of lamproite in Majiang area, Southestern Guizhou Province. Methods: All the samples were crashed to 200- mesh for whole- rock geological analyses were performed at ALS Chemex (Guangzhou) Co Ltd., include major, minor and REE elements. Whole- rock abundance of major elements were analyzed by X- ray fluoresscene(XRF) method. Minor and REE elements were analyzed by using a Elan6000 inductively coupled plasma mass spectrometry(ICP- MS). Electron microprobe(EMP) analysis: quantitative EMP analyses were performed using a JEOL electron- probe microanalyzer JXA- 8100 at the Institute of Geology and Minerals Resources in Xi’an, Shaanxi Province. The instrument was set to operate at an accelerating voltage of 20 kV , 10 nA probe current and 1 μm probe diameter. Results: The major and rare earth elements composition of the investigated rock samples are shown in table 1 and 2. The ΣREE+Y contents of weathered lamproite range from 558.78×10-6 to 2409.94×10-6, with an average of 1461.21×10-6. The average contents of LREE and HREE are 1346.44×10-6 and 53.52×10-6, respectively. Electron microprobe (EMP) analysis show that the high content of REE occurred in monazites, which are associated with minerals such as chlorites, rutiles and zrcon. Conclusioins: The high contents of rare earth elements(REEs) occur in weathering crust of lamproite in Majiang area, southestern Guizhou Province and relationship between the contents of rare earth element and degree of weathering of lamproite is a positively correlation. The weathering crust of lamproites are characterized by enrichment of LREE (La, Ce, Nd and Pr), it has conditions and potential to form rare earth element deposit. The REE in weathered lamproite are mostly in the form of rare earth independent mineral, which are mainly monazites.

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YANG Guanghai, GAO Junbo, YANG Ruidong, TIAN Yazhou, YANG Guangzhong, XU Hai, FENG Kangning.2019. Characteristic and prospecting significance of the rare earth elements enrichment in weathering crust of lamproite, southeastern Guizhou[J]. Geological Review,65(4):948-960.

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History
  • Received:October 06,2018
  • Revised:June 15,2019
  • Adopted:
  • Online: July 17,2019
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