Variations in the chemical composition of illite from five geothermal fields; a possible geothermometer

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doi: 10.1180/0009855043940150
Authors:Battaglia, S.
Author Affiliations:Primary:
Istituto di Geoscienze e Georisorse, Pisa, Italy
Volume Title:Clay Minerals
Source:Clay Minerals, 39(4), p.501-510. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0009-8558
Publication Date:2004
Note:In English. 34 refs.; illus., incl. 2 tables
Summary:Previous attempts to use illite as a geothermometer have failed: no general relation between the mineral's chemical composition and temperature of crystallization has been found. Here, chemical compositions of 27 illite samples from five different geothermal fields (the data on four of which were drawn from the literature) were compared with their crystallization temperatures. As previously reported by Cathelineau (1988), the K content was found to be the only variable yielding a suitable correlation, but only when applied to one geothermal field; when various geothermal systems were considered, the correlation weakened considerably. Introduction of a correction algorithm to the K content of the illite has made it possible to draw a single line to fit the data from all the studied samples, yielding a good correlation coefficient (r = 0.84).
Sections:Clay minerals
Subsections:Specific structures: silicates
Mineral Groups:Sheet silicates
Subjects:Algorithms; Chemical composition; Clay mineralogy; Corrections; Correlation coefficient; Crystal chemistry; Crystallization; Electron probe data; Geochemistry; Geologic thermometry; Geothermal fields; Geothermal systems; Illite; Sheet silicates; Silicates; Statistical analysis; Temperature; Variations; Africa; Australasia; California; East Africa; Ethiopia; Mexico; New Zealand; United States
Abstract Numbers:05M/4019
Record ID:2005053713
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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