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Lithium-Bearing Donbassite and Tosudite from Echassières, Massif Central, France

Published online by Cambridge University Press:  02 April 2024

T. Merceron ,
A. Inoue ,
A. Bouchet  and
A. Meunier
T. Merceron
Affiliation:
Université de Poitiers, Laboratoire de Petrologie des Altérations Hydrothermales, U.A. 721 au C.N.R.S., 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
A. Inoue*
Affiliation:
Université de Poitiers, Laboratoire de Petrologie des Altérations Hydrothermales, U.A. 721 au C.N.R.S., 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
A. Bouchet
Affiliation:
Université de Poitiers, Laboratoire de Petrologie des Altérations Hydrothermales, U.A. 721 au C.N.R.S., 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
A. Meunier
Affiliation:
Université de Poitiers, Laboratoire de Petrologie des Altérations Hydrothermales, U.A. 721 au C.N.R.S., 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
*
1Permanent address: Geological Institute, College of Arts & Sciences, Chiba University, Chiba 260, Japan.
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Abstract

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Lithium-bearing donbassite and tosudite were found in veins in hydrothermally altered granite (Beauvoir granite) in the northern part of the Massif Central, France. The two minerals are characterized by their high Li contents and low Mg and Fe contents; their structural formulae are: $${\left( {S{i_{3.81}}A{l_{0.19}}} \right)_{\Sigma = 4.00}}{O_{10}}{\left( {A{l_{3.81}}L{i_{0.52}}Fe_{0.01}^{2 + }C{a_{0.02}}M{g_{0.01}}} \right)_{\Sigma - 4.38}}{\left( {OH} \right)_8}{\left( {N{a_{0.07}}{K_{0.04}}} \right)_{\Sigma = 0.11}}$$ for donbassite and $${\left( {S{i_{3.50}}A{l_{0.50}}} \right)_{\Sigma = 4.00}}{O_{10}}{\left( {A{l_{2.95}}L{i_{0.22}}Fe_{0.01}^{3 + }T{i_{0.01}}} \right)_{\Sigma = 3.19}}{\left( {OH} \right)_5}{\left( {C{a_{0.01}}N{a_{0.15}}{K_{0.18}}} \right)_{\Sigma = 0.34}}$$ for tosudite.

These chemical compositions indicate that the donbassite is an intermediate member of the donbassite-cookeite solid solution series and that the tosudite consists of interstratified Li-donbassite and beidellite. Both Li-bearing minerals show thermal behavior distinct from those previously reported for dioctahedral chlorite and tosudite.

Petrographie investigation of drill cuttings from the Echassières area indicates that the two minerals were formed in an intermediate stage of hydrothermal alteration following an early stage characterized by formation of muscovite (2M1) at >350°C and before the latest stage characterized by deposition of kaolinite and randomly interstratified illite/smectite at < 100°C. Moreover, tosudite occurs in the upper part of the granite, whereas donbassite is restricted to the lower part, suggesting the formation of tosudite at lower temperatures.

Keywords

DonbassiteGraniteHydrothermal alterationInfrared spectroscopyLithiumPetrographyTosuditeX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 1 , February 1988 , pp. 39 - 46
Copyright
Copyright © 1988, The Clay Minerals Society

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