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Electron Energy-Loss Spectroscopy (EELS) of Fe-Bearing Olivine and Laihunite (an Oxidized Olivine)

Published online by Cambridge University Press:  02 July 2020

Huifang Xu  and
Pingqiu Fu
Huifang Xu
Affiliation:
Department of Earth and Planetary Sciences The University of New Mexico, Albuquerque, New Mexico, 87131, U. S. A.
Pingqiu Fu
Affiliation:
Institute of Geochemistry, Science Academy of China Guiyang, Guizhou , 550002, P. R., China
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Extract

Laihunite that has distorted olivine-type structure with ferric and ferrous irons and ordered distribution of vacancies was first discovered in a high-grade metamorphosed banded iron formation (BIF) [1, 2]. The laihunite coexisting with fayalite (Fe-olivine), magnetite, quartz, ferrosilite, garnet and hedenbergite, formed in the process of oxidation of fayalite [2, 3]. The structure refinement of 1-layer laihunite shows P21/b symmetry and ordered distribution of vacancies in half M1 sites of olivine structure [2, 3]. Early high-resolution transmission electron microscopy (HRTEM) study and HRTEM image simulation of the 1-layer laihunite verified the structure refinement [4].

Specimens of weakly oxidized fayalite and laihunite containing fayalite islands collected from Xiaolaihe and Menjiagou of Liaoning Province, NE China, have been studied using selected area electron diffraction (SAED), high-resolution transmission electron microscopy (HRTEM), electron energy-loss spectroscopy (EELS), and X-ray energy-dispersive spectroscopy.

Type
Electron Energy-Loss Spectroscopy (EELS) and Imaging
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 208 - 209
Copyright
Copyright © Microscopy Society of America

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References

1. Laihunite Research Group (1976) Laihunite — a new iron silicate mineral (in Chinese). Geochimica 2: 95-103.Google Scholar
2.Fu, P, Kong, Y and Zhang, L (1982) Domain twinning of laihunite and refinement of its crystal structure. Chinese Journal of Geochemistry 1: 115–133.Google Scholar
3.Kitamura, M, Shen, B, Banno, S and Morimoto, N (1984) Fine texture of laihunite. American Mineral 69: 154–160.Google Scholar
4.Chou, BS (1985) Fine textures in silicate minerals, in Kuo, K. H. and Ye, H. Q. ed., “Hih-Resolution Electron Microscopy“, Science Press, Beijing, pp 423–445.Google Scholar