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Lithium-Bearing Hydrothermal Alteration Phyllosilicates Related to Portalet Fluorite Ore (Pyrenees, Huesca, Spain)

Published online by Cambridge University Press:  09 July 2018

J. M. Gonzlez Lopez ,
I. Subias Pirez ,
C. Fernandez-Nieto  and
I. Fanlo Gonzalez
J. M. Gonzlez Lopez
Affiliation:
Cristalografia y Mineralogia, Dpto. Ciencias de la Tierra Universidad de Zaragoza, 50009 Zaragoza, Spain
I. Subias Pirez
Affiliation:
Cristalografia y Mineralogia, Dpto. Ciencias de la Tierra Universidad de Zaragoza, 50009 Zaragoza, Spain
C. Fernandez-Nieto
Affiliation:
Cristalografia y Mineralogia, Dpto. Ciencias de la Tierra Universidad de Zaragoza, 50009 Zaragoza, Spain
I. Fanlo Gonzalez
Affiliation:
Cristalografia y Mineralogia, Dpto. Ciencias de la Tierra Universidad de Zaragoza, 50009 Zaragoza, Spain
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Abstract

Phyllosilicate associations in hydrothermally altered fluorite ore bodies are: Li-chlorite ± pyrophyllite ± interstratified minerals ± muscovite +± kaolinite. Chlorites, the main alteration minerals, are dioctahedral, d060 = 1.489-1-490/~,, of Ia polytype. The structural formulae indicate substitution of AI for Si from 0.61-0.78 atoms. The total octahedral occupancy ranges from 4.52-4-71 atoms, with 0.49-0-69 Li atoms per half cell unit. This composition indicates that the chlorites are intermediate members of the donbassite-cookeite series proposed by Sudo (1978). The mineralogical associations and textural relations suggest that after intensive silicification which produced alkali alteration under acid conditions, pyrophyllite was produced at the expense of muscovite and then Li-bearing donbassite formed from the pyrophyllite. The Li needed for the formation of the chlorites could be genetically related to granitic batholiths which occur close to the fluorite ores.

Type
Research Article
Information
Clay Minerals , Volume 28 , Issue 2 , June 1993 , pp. 275 - 283
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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