The effects of composition upon the high-pressure behaviour of amphiboles: compression of gedrite to 7 GPa and a comparison with anthophyllite and proto-amphibole (Articolo in rivista)

Type
Label
  • The effects of composition upon the high-pressure behaviour of amphiboles: compression of gedrite to 7 GPa and a comparison with anthophyllite and proto-amphibole (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1180/minmag.2012.076.4.14 (literal)
Alternative label
  • NESTOLA F. [1,2]; PASQUAL D. [1]; WELCH M.D. [3]; OBERTI R. [4] (2012)
    The effects of composition upon the high-pressure behaviour of amphiboles: compression of gedrite to 7 GPa and a comparison with anthophyllite and proto-amphibole
    in Mineralogical magazine (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • NESTOLA F. [1,2]; PASQUAL D. [1]; WELCH M.D. [3]; OBERTI R. [4] (literal)
Pagina inizio
  • 987 (literal)
Pagina fine
  • 995 (literal)
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  • http://minmag.geoscienceworld.org/ (literal)
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  • 76 (literal)
Rivista
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  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • [1] Dipartimento di Geoscienze, Universita` di Padova, via Gradenigo 6, 35131 Padova, Italy [2] CNR Istituto di Geoscienze e Georisorse, UOS Padova, via Gradenigo 6, 35131 Padova, Italy [3] Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, UK [4] CNR Istituto di Geoscienze e Georisorse, UOS Pavia, via Ferrata 1, 27100 Pavia, Italy (literal)
Titolo
  • The effects of composition upon the high-pressure behaviour of amphiboles: compression of gedrite to 7 GPa and a comparison with anthophyllite and proto-amphibole (literal)
Abstract
  • A single-crystal X-ray diffraction study of a sample of natural gedrite from North Carolina, USA, with the crystal-chemical formula ANa0.47 B(Na0.03Mg0.97Fe2+ 0.94Mn0.02Ca0.04)C(Mg3.52Fe2+ 0.28Al1.15Ti4+ 0.05) T(Si6.31Al1.69)O22 W(OH)2, up to a maximum pressure of 7 GPa, revealed the following bulk and axial moduli and their pressure derivatives: K0T = 91.2(6) GPa [K0T' = 6.3(2)]; K0T(a) = 60.5(6) GPa [K0T(a)' = 6.1(2)]; K0T(b) = 122.8(2.6) GPa [K0T(b)' = 5.7(8)]; K0T(c) = 119.7(1.5) GPa [K0T(c)' = 5.1(5)]. Gedrite has a much higher bulk modulus than anthophyllite (66 GPa) and proto-amphibole (64 GPa). All of the three axial moduli of gedrite are higher than those of these two other orthoamphiboles. The greater stiffness of gedrite along [100] is due to its high ANa content, which is almost zero in anthophyllite and proto-amphibole. The much greater stiffness parallel to the (100) plane of gedrite compared with the two other amphiboles is probably due to its high CAl content. A comparison is made with published data available for orthorhombic B(Mg,Mn,Fe) and monoclinic BCa amphiboles to identify correlations between crystal-chemistry and compressibility in amphiboles. (literal)
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