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Cation-site partitioning in Ti-rich micas from Black Hill (Australia): A multi-technical approach

Published online by Cambridge University Press:  01 January 2024

Emanuela Schingaro ,
Fernando Scordari ,
Ernesto Mesto ,
Maria Franca Brigatti  and
Giuseppe Pedrazzi
Emanuela Schingaro
Affiliation:
Dipartimento Geomineralogico, Universita’ di Bari, via E. Orabona 4, I-70125 Bari, Italy
Fernando Scordari*
Affiliation:
Dipartimento Geomineralogico, Universita’ di Bari, via E. Orabona 4, I-70125 Bari, Italy
Ernesto Mesto
Affiliation:
Dipartimento Geomineralogico, Universita’ di Bari, via E. Orabona 4, I-70125 Bari, Italy
Maria Franca Brigatti
Affiliation:
Dipartimento di Scienze della Terra, Universita’ di Modena e Reggio Emilia, P.zza S. Eufemia 19, I-41100 Modena, Italy
Giuseppe Pedrazzi
Affiliation:
Dipartimento di Sanita’ Pubblica, Sezione di Fisica, Plesso Biotecnologico Integrato via Volturno 39, I-43100 Parma, Italy
*
*E-mail address of corresponding author: [email protected]
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Abstract

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The crystal chemistry of Ti-rich trioctahedral micas of plutonic origin, cropping out at Black Hill (South Australia) has been investigated by combining electron microprobe analysis, single crystal X-ray diffraction, Mössbauer spectroscopy and X-ray photoelectron spectroscopy. Chemical analyses have shown the samples taken to be quite homogeneous and Ti-rich (TiO2 ≈ 7 wt.%). Mössbauer investigation yielded Fe2+/Fe3+ ≈ 30. X-ray photoelectron spectroscopy analysis seems to suggest the occurrence of three Ti species: octahedral Tr4+(60%), octahedral Ti3+(26%), and tetrahedral Ti4+(14%). The analyzed sample belongs to the 1M polytype and the relevant crystal data from structure analysis are: a = 5.347(1) Å, b = 9.261(2) Å, c = 10.195(2) Å, β = 100.29°(1). Anisotropic structure refinement was performed in space group C2/m, and converged at R = 2.62, Rw = 2.80. Structural details (the c cell parameter, the off-center shift of the M2 cation towards 04, the bond-length distortions of the cis-M2 octahedron, the interlayer sheet thickness, the projection of K−O4 distance along c*, the difference <K−O>outer-<K−O>inner) support the occurrence of the Ti-oxy substitution (VIR2+ + 2(OH)− ⇌ Ti4+ + 202− + H2) in the sample. Analysis of structural distortions as a function of the Ti content revealed that the positions of the oxygens 03 and 04 are displaced in opposite senses along [100]. This produces an enlargement of the M1 site with respect to the M2 site and a shortening of the interlayer distance. This trend seems to be in common with other Ti-rich 1M micas of plutonic origin.

Keywords

Crystal ChemistryMössbauer InvestigationStructure RefinementTi SubstitutionsTrioctahedral Micas 1MXPS Investigation
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 2 , April 2005 , pp. 179 - 189
Copyright
Copyright © Clay Minerals Society 2005

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