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GEOREF RECORD

Scapolites; variation of structure with pressure and possible role in the storage of fluids

P. Comodi, M. Mellini and P. F. Zanazzi
Scapolites; variation of structure with pressure and possible role in the storage of fluids
European Journal of Mineralogy (April 1990) 2 (2): 195-202

Abstract

The structural evolution of meionite- and marialite-rich scapolites with increasing P has been studied for Me (sub 68) and Me (sub 17) compositions. The cell parameters decrease from a 13.033, c 7.569 (1 bar) to a 11.810, c 7.507 Angstrom (29 kbar) for Me (sub 17) , and from a 12.172, c 7.563 (1 bar) to a 11.970, c 7.470 Angstrom (41 kbar) for Me (sub 68) . Me (sub 68) behaves almost isotropically with a bulk modulus of 860 kbar, but Me (sub 17) is more anisotropic, with a bulk modulus of 600 kbar. These differences are determined by different rigidities of the Na-O and Ca-O bonds. This response can be analysed in terms of cooperative rotations of four-membered tetrahedral rings. The comparative study of high-P and high-T data also indicates the expected structural stability of scapolite within the granulite P-T field.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 2
Serial Issue: 2
Title: Scapolites; variation of structure with pressure and possible role in the storage of fluids
Affiliation: Univ. Perugia, Dip. Sci. Terra, I-06100 Perugia, Italy
Pages: 195-202
Published: 199004
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 23
Accession Number: 1993-015454
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 5 tables
S11°40'00" - S01°00'00", E29°30'00" - E40°30'00"
N40°49'00" - N40°49'00", E14°25'60" - E14°25'60"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
Update Code: 1993
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