Study on REE Distribution and Mineralogical Characteristics of Different Garnets by Electron Probe and Inductively Coupled Plasma-Mass Spectrometry

JIA Yu-heng; QIAN Jian-ping

doi:10.15898/j.cnki.11-2131/td.202005060007

Rock and Mineral Analysis > 2020 > 39(6): 886-895. > DOI: 10.15898/j.cnki.11-2131/td.202005060007

JIA Yu-heng, QIAN Jian-ping. Study on REE Distribution and Mineralogical Characteristics of Different Garnets by Electron Probe and Inductively Coupled Plasma-Mass Spectrometry[J]. Rock and Mineral Analysis, 2020, 39(6): 886-895. DOI: 10.15898/j.cnki.11-2131/td.202005060007

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Study on REE Distribution and Mineralogical Characteristics of Different Garnets by Electron Probe and Inductively Coupled Plasma-Mass Spectrometry

JIA Yu-heng,
QIAN Jian-ping^,

College of Earth Sciences, Guilin University of Technology, Guilin 541006, China

More Information

Received Date: April 14, 2020
Revised Date: August 05, 2020
Accepted Date: September 18, 2020
Published Date: October 31, 2020

Abstract

HIGHLIGHTS
(1) Isomorphic substitution affected the crystal structure of garnet. X-ray powder diffraction analysis showed that the cell parameters of garnet with different colors had obvious differences.

(2) The Raman spectra and UV-Vis absorption spectra of garnets with different colors had good correspondence with their characteristic elements.

(3) The LREE/HREE of garnet was less than 1, indicating that garnet had lattice preference for HREE.

ABSTRACT

BACKGROUNDGarnet is a common silicate mineral in metamorphic and magmatic rocks, and its isomorphism is very common. The existing data show that the color of garnet with different composition is quite different, but the relationship between the composition and color of garnet has not been systematically studied.
OBJECTIVESTo reveal the internal relationship and variation law of garnet composition, structure and color, and provide a basis for the summary and geological application of the mineralogical characteristics of garnet in different geological environments.
METHODSCommon red (G1), orange (G2), green (G3) and maroon (G4) garnet have been tested systematically by electron microprobe, inductively coupled plasma-mass spectrometry, X-ray powder crystal diffraction, Raman spectroscopy, infrared spectroscopy and ultraviolet-visible absorption spectroscopy.
RESULTSThe results showed that the samples of G1 and G4 contained more Fe (Fe³⁺:0.24%, 0.24%, Fe²⁺:1.01%, 0.89%). The samples of G2 contained higher Mn (2.76%), whereas the samples of G3 have higher Cr and V contents of 3453×10^-6 and 1458×10^-6, respectively. Isomorphic substitution greatly affected the crystal structure of garnet. The cell parameters were a=11.530nm(G1), 11.563nm(G2), 11.849nm(G3) and 11.470nm(G4). Trace and rare earth elements in garnet can be used to indicate the source and formation process. The rare earth element analysis showed that the total rare earth elements of garnet were distributed unevenly, and the ratio of LREE/HREE was less than 1, with enriched heavy rare earth elements. The Eu/Eu^* ratio was less than 1, which was a negative Eu anomaly. Ce abnormalities of all samples were not obvious. G1 and G4 have Fe³⁺ electronic transition absorption peak at 570nm. G2 has Mn²⁺ electronic transition absorption peak near 460nm and 520nm, whereas G3 has Cr³⁺ electronic transition absorption peaks at 690nm. The Raman spectra of garnet samples showed obvious differences in peak intensity and position, which also reflected the ubiquitous existence of isomorphism in these garnets. The ultraviolet-visible absorption spectra of these garnets showed high consistency with its color and characteristic elements. The absorption peaks of Fe³⁺ in red and maroon samples at 570nm were related to the high content of Fe, while the characteristic absorption peaks of orange sample near 460 and 520nm belong to Mn²⁺, corresponding to the large amount of Mn (2.76%). A strong absorption peak was observed at 690nm in the green sample, which was caused by the transition of Cr³⁺ and the presence of trace element Cr (3453×10^-6). The results showed that the color of garnet had a good correspondence with its composition and structure.
CONCLUSIONSThe color characteristics of garnet can be used as a typomorphic feature of minerals to indicate the existence of different characteristic elements. These methods can be used to study the isomorphism and color origin of garnet effectively.
- garnet,
- isomorphic replacement,
- distribution of rare earth elements,
- mineralogy characteristics

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Corresponding author: QIAN Jian-ping, jpjian@163.com

College of Earth Sciences, Guilin University of Technology, Guilin 541006, China

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Study on REE Distribution and Mineralogical Characteristics of Different Garnets by Electron Probe and Inductively Coupled Plasma-Mass Spectrometry