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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
Source Normalized Impact per Paper (SNIP) 2017: 1.059

Online
ISSN
1945-3027
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Volume 88, Issue 10

Issues

Contrasting bonding behavior of two hydroxyl-bearing metamorphic minerals under pressure: Clinozoisite and topaz

Scott Edwin Bradbury / Quentin Williams
Published Online: 2015-03-31 | DOI: https://doi.org/10.2138/am-2003-1010

Abstract

Clinozoisite and topaz are examined to pressures of 36 and 24 GPa, respectively, at 300 K using infrared spectroscopy. Both minerals metastably persist throughout this pressure range at ambient temperature. Both stretching and bending vibrations of the silicate tetrahedra are tracked upon compression and decompression of each phase, as are their hydroxyl-stretching vibrations. The hydroxylstretching vibrations lie at 3650 cm-1 in topaz and 3351 cm-1 in clinozoisite and shift by 0.6 (± 0.3) cm-1/GPa and -5.1 (± 0.9) cm-1/GPa, respectively. Therefore, the hydrogen bonding in clinozoisite and topaz responds completely differently to pressure: hydrogen bonding increases in clinozoisite, but decreases in topaz. The clinozoisite hydroxyl-stretching vibration also broadens by almost a factor of six under compression. Both the clinozoisite peak shift and its pressure-induced broadening are simulated using a model of the hydrogen bond potential. The markedly different structural responses of these two minerals to pressure are interpreted on crystal-chemical grounds, and demonstrate that the bonding of hydrogen in possible subduction-related hydrous phases varies dramatically, depending on crystal chemistry.

About the article

Received: 2002-09-30

Accepted: 2003-05-28

Published Online: 2015-03-31

Published in Print: 2003-10-01


Citation Information: American Mineralogist, Volume 88, Issue 10, Pages 1460–1470, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2003-1010.

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© 2015 by Walter de Gruyter Berlin/Boston.

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