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Compositional and Structural Variation of Sudoite from the Betic Cordillera (Spain): A TEM/AEM Study

Published online by Cambridge University Press:  01 January 2024

María Dolores Ruiz Cruz  and
Carlos Sanz de Galdeano
María Dolores Ruiz Cruz*
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogáa, Facultad de Ciencias, Campus de Teatinos, Universidad de Málaga, Spain
Carlos Sanz de Galdeano
Affiliation:
Institute Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Facultad de Ciencias, 18071 Granada, Spain
*
*E-mail address of corresponding author: mdruiz@uma.es
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Abstract

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Sudoite from diagenetic to very low-grade metaclastites of the Betic Cordillera was studied by X-ray diffraction and transmission/analytical electron microscopy. Sudoite formed directly from dickite, the assemblage dickite + sudoite + illite being replaced at increasing metamorphic grade by the assemblage pyrophyllite + sudoite + illite. Sudoite ranges in composition from Mg-rich to Fe-rich chemistries. In addition, a wide variety of mixed-layered structures (illite-sudoite, pyrophyllite-sudoite, and dickite-sudoite) was also identified. Mg-rich sudoite shows a mean chemical composition of (Al2.91Fe0.252+Mg1.80)(Si3.10Al0.90)O10(OH)8, and a IIb ordered structure with b = 9.055 Å. Intermediate Fe-Mg sudoite exhibits a very variable composition, the Fe-rich phases having a mean composition of (Al2.09Fe0.613+Fe0.872+Mg1.44)(Si3.31Al0.69O10(OH)8. These are disordered polytypes with b values ranging from 9.070 to 9.101 Å. Fe occurs in both octahedral sheets, according to two types of substitutions: Fe3+ for Al in the dioctahedral sheet and Fe2+ for Mg in the trioctahedral sheet. Sudoite with such a composition has not been described previously.

Keywords

Betic CordilleraDickiteIlliteMixed-layerPyrophylliteSpainSudoite
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 6 , December 2005 , pp. 639 - 652
Copyright
Copyright © 2005, The Clay Minerals Society

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