caa a22 4500 463217497 CHVBK 20180405153201.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s00269-007-0169-3 doi (NATIONALLICENCE)springer-10.1007/s00269-007-0169-3 Mechanisms of OH defect incorporation in naturally occurring, hydrothermally formed diopside and jadeite [Elektronische Daten] [M. Andrut, M. Wildner, J. Ingrin, A. Beran] The IR spectrum of an alpine, hydrothermally formed diopside containing 17wt ppm H2O consists of three main OH absorption bands centred at 3647, 3464 and 3359cm−1. Jadeite from a Californian vein occurrence is characterised by bands at 3616 and 3557cm−1 and contains about 197wt ppm H2O. Based on the pleochroic scheme of the OH absorption bands in diopside, OH defect incorporation models are derived on the basis of fully occupied cation sites and under the assumption of M1 and M2 site vacancies; OH defects replacing O2 oxygen atoms are most common. The less pronounced OH pleochroism and the broad band absorption pattern of jadeite indicate a high degree of OH defect disordering. The pleochroic scheme of the main absorption bands at 3616 and 3557cm−1 implies partial replacement of O2 oxygen atoms by OH dipoles pointing to vacant Si sites. Under the assumption of M1 and M2 site vacancies, O1-H and O2-H defects are also derivable. OH incorporation modes assuming Si-vacancies should be considered for jadeite-rich clinopyroxenes formed in deep crust and upper mantle regions. Springer-Verlag, 2007 Diopside nationallicence Jadeite nationallicence Pyroxene nationallicence OH defect nationallicence IR spectroscopy nationallicence Andrut M. Institut für Mineralogie und Kristallographie, Universität Wien-Geozentrum, Althanstraße 14, 1090, Wien, Austria aut Wildner M. Institut für Mineralogie und Kristallographie, Universität Wien-Geozentrum, Althanstraße 14, 1090, Wien, Austria aut Ingrin J. Laboratoire des Mécanismes et Transferts en Géologie, CNRS, Université Paul-Sabatier, Observatoire Midi-Pyrénées, 14 avenue Edouard Belin, 31400, Toulouse, France aut Beran A. Institut für Mineralogie und Kristallographie, Universität Wien-Geozentrum, Althanstraße 14, 1090, Wien, Austria aut Physics and Chemistry of Minerals Springer-Verlag 34/8(2007-10-01), 543-549 0342-1791 34:8<543 2007 34 269 https://doi.org/10.1007/s00269-007-0169-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00269-007-0169-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Andrut M. Institut für Mineralogie und Kristallographie, Universität Wien-Geozentrum, Althanstraße 14, 1090, Wien, Austria aut NATIONALLICENCE 700 1- Wildner M. Institut für Mineralogie und Kristallographie, Universität Wien-Geozentrum, Althanstraße 14, 1090, Wien, Austria aut NATIONALLICENCE 700 1- Ingrin J. Laboratoire des Mécanismes et Transferts en Géologie, CNRS, Université Paul-Sabatier, Observatoire Midi-Pyrénées, 14 avenue Edouard Belin, 31400, Toulouse, France aut NATIONALLICENCE 700 1- Beran A. Institut für Mineralogie und Kristallographie, Universität Wien-Geozentrum, Althanstraße 14, 1090, Wien, Austria aut NATIONALLICENCE 773 0- Physics and Chemistry of Minerals Springer-Verlag 34/8(2007-10-01), 543-549 0342-1791 34:8<543 2007 34 269 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer