Study on the Infrared Spectral Characteristics of H<sub>2</sub>OⅠ-type Emerald and the Controlling Factors

Xin QIAO; Zheng-yu ZHOU; Pei-zhen NONG; Meng LAI; Ying-bo LI; Kai-peng GUO; Qian ZHONG; Han WANG; Yan ZHOU

doi:10.15898/j.cnki.11-2131/td.201804070039

2019 Vol. 38, No. 2

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Article navigation > Rock and Mineral Analysis > 2019 > 38(2): 169-178

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Xin QIAO, Zheng-yu ZHOU, Pei-zhen NONG, Meng LAI, Ying-bo LI, Kai-peng GUO, Qian ZHONG, Han WANG, Yan ZHOU. Study on the Infrared Spectral Characteristics of H2OⅠ-type Emerald and the Controlling Factors[J]. Rock and Mineral Analysis, 2019, 38(2): 169-178. doi: 10.15898/j.cnki.11-2131/td.201804070039

Citation:

Xin QIAO, Zheng-yu ZHOU, Pei-zhen NONG, Meng LAI, Ying-bo LI, Kai-peng GUO, Qian ZHONG, Han WANG, Yan ZHOU. Study on the Infrared Spectral Characteristics of H₂OⅠ-type Emerald and the Controlling Factors[J]. Rock and Mineral Analysis, 2019, 38(2): 169-178. doi: 10.15898/j.cnki.11-2131/td.201804070039

Study on the Infrared Spectral Characteristics of H₂OⅠ-type Emerald and the Controlling Factors

1.
School of Ocean & Earth Science, Tongji University, Shanghai 200092, China
2.
Shanghai Engineering Research Center of Gems & Technological Materials, Shanghai 200070, China
3.
Laboratory of Gem and Technological Materials, Tongji University, Shanghai 200092, China

More Information

Corresponding author: Zheng-yu ZHOU, 06058@tongji.edu.cn

Received Date: 07 April 2018

Revised Date: 23 November 2018

Accepted Date: 04 January 2019

Abstract

Abstract

BACKGROUNDThe infrared absorption mechanism is mainly related to the Si-O lattice, channel structure water, other alkaline metal cations, and vibration of molecules. Relevant research at home and abroad focuses mainly on peak position attribution and spectral peak feature comparison. It is considered that molecular vibration is related to different types of structural water. However, there are few studies on deeper mineralization or chemical controlling factors. OBJECTIVESTo unravel the controlling factors of H₂OⅠ-type infrared spectral characteristics. METHODSThe typical H₂OⅠ-type natural emeralds were collected from 4 mining areas, including the Eastern Cordillera mountains in Colombia (EC), the Panjshir valley in Afghanistan(P), the Ural mountains in Russia(U), and the Kaduna/Plateau state in Nigeria (KP). The samples were analyzed by Fourier Transformed Infrared Spectrometer (FTIR). The typical H₂OⅠ-type infrared (IR) spectral characteristics and their controlling factors were studied. The chemical composition data were obtained from the EMPA analyses. RESULTSThe results show that the spectral characteristics of H₂O Ⅰ-type emeralds from different mining areas share a consistent pattern. Several absorptions related to structural water, basic ions and macromolecules had stable peak positions, approximately similar relative peak intensities and peak shapes. As the analysis proved, the H₂OⅠIR spectra were first directly controlled by the mixed ratio of the two types of the structure water in the channel, and further related to the substitution of Al³⁺, chemically controlled by the (Mg²⁺+Fe²⁺) concentration in the ore fluids. When the concentration of (Mg²⁺+Fe²⁺) was low, the degree of isomorphic substitution was lower, and the emerald structure water was mainly characterized by Ⅰ-type water. The related elements were characterized by high Si and Al but low Mg and Fe, corresponding to the typical infrared characteristics, indicating the relationship between chemical ion concentration and infrared spectral characteristics. CONCLUSIONSThe research process showed that Infrared Spectroscopy could assist in the identification of Ⅰ-type water emerald production discrimination and the understanding of the metallogenic environment.
- emerald /
- Infrared Spectrometry /
- H₂OⅠ-type /
- isomorphic substitution /
- (Mg²⁺+Fe²⁺) cations concentration

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References

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