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Sulphate efflorescent minerals from the El Jaroso ravine, Sierra Almagrera, Spain—a scanning electron microscopic and infrared spectroscopic study

Frost, Ray L., Wain, Daria L., Reddy, B. Jagannadha, Martinez-Frias, Jesus, Rull, Fernando, & Martens, Wayde N. (2006) Sulphate efflorescent minerals from the El Jaroso ravine, Sierra Almagrera, Spain—a scanning electron microscopic and infrared spectroscopic study. Journal of Near Infrared Spectroscopy, 14(3), pp. 167-178.

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Abstract

NIR spectroscopy is a technique that can be utilised to analyse minerals remotely through a fibre optic cable. A suite of sulphate efflorescent minerals from the El Jaroso Ravine, Sierra Almagrera, Spain have been analysed by UV, visible, NIR and mid-IR spectroscopy. Such a suite of minerals may be used to model the types of mineral deposits on Mars. The minerals were analysed by SEM and EDX before spectroscopic analysis. Halotrichite was observed and the EDX analyses showed the mineral to be a mixture of heinrichite and pickingerite. The NIR spectrum of the eflorescencia sample showed the sulphate deposit to be composed of a mixture of jarosite and halotrichites. The 7400 to 6400 cm-1(1351 to 1562 nm) NIR spectral region of the efflorescent sulphate minerals can be used to characterise the various sulphate deposits. The detection of a band at 8338 cm-1 (1199 nm) reveals the presence of ferrous iron in jarosite which is unusual for the jarosite minerals. This can be caused by ferric iron reduction by thermophilic iron-oxidizing bacteria. Mid-IR spectra showed the characteristic OH stretching bands of the jarosites and the efflorescent mixtures. The position of water stretching vibrations at 2900 cm-1 and lower shows strong hydrogen bonding as is also evidenced by water bending modes at around 1682 cm-1.

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ID Code: 4618
Item Type: Journal Article
Additional Information: Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal's website (see link) or contact the author. Author contact details: r.frost@qut.edu.au This manuscript is one of a series of papers on natural minerals such as jarosites. These minerals have been found on the planet Mars
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Keywords: efflorescent minerals, evaporite, jarosite, halotrichite, sulphate, NIR spectroscopy
ISSN: 0967-0335
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Mineralogy and Crystallography (040306)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2006 NIR Publications
Deposited On: 08 Nov 2006
Last Modified: 29 Feb 2012 23:23

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