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Quantification of hematite from the visible diffuse reflectance spectrum: effects of aluminium substitution and grain morphology

Published online by Cambridge University Press:  09 July 2018

Q. S. Liu ,
J. Torrent ,
V. Barrón ,
Z. Q. Duan  and
J. Bloemendal
Q. S. Liu
Affiliation:
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, P.R. China
J. Torrent*
Affiliation:
Departamento de Ciencias y Recursos Agrícolas y Forestales, Universidad de Córdoba, Edificio C4, Campus de Rabanales, 14071 Córdoba, Spain
V. Barrón
Affiliation:
Departamento de Ciencias y Recursos Agrícolas y Forestales, Universidad de Córdoba, Edificio C4, Campus de Rabanales, 14071 Córdoba, Spain
Z. Q. Duan
Affiliation:
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, P.R. China Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, P.R. China
J. Bloemendal
Affiliation:
Department of Geography, University of Liverpool, Roxby Building, Liverpool L69 3BX, UK
*
*E-mail: torrent@uco.es
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Abstract

Hematite exists ubiquitously in soils and sediments, and is commonly aluminium (Al)-substituted. This study investigated systematically the effects of Al substitution on the visible diffuse reflectance spectrum (DRS) of hematite by using several sets of synthetic samples. We found that the position and amplitude of the characteristic absorption band of hematite (estimated from the first- and second-order derivative curves of the Kubelka-Munk remission function spectrum derived from the DRS) was significantly affected by the degree of Al substitution as well as by sample grain morphology. Therefore, there are ambiguities in quantifying the degree of Al substitution and the mass concentration of hematite using DRS. Nevertheless, if hematite forms under similar environmental conditions, it is possible to establish a transfer function between the DRS parameters and hematite concentration as discussed here for a Chinese loess-palaeosol sequence.

Keywords

hematitediffuse reflectance spectroscopyaluminium substitution
Type
Research Papers
Information
Clay Minerals , Volume 46 , Issue 1 , March 2011 , pp. 137 - 147
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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