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Högbomite in sapphirine-bearing rocks from the Bamble Sector, south Norway

Published online by Cambridge University Press:  05 July 2018

D. Visser
Affiliation:
Department of Geochemistry, Institute of Earth Sciences, University of Utrecht, P.O, Box 80.021, 3508 TA Utrecht, The Netherlands
P. H. M. Thijssen
Affiliation:
Department of Geochemistry, Institute of Earth Sciences, University of Utrecht, P.O, Box 80.021, 3508 TA Utrecht, The Netherlands
J. C. Schumacher
Affiliation:
Mineralogisches Institut, Olshausenstrasse 40, W-2300 Kiel, Germany

Abstract

Högbomite is reported from two upper-amphibolite and granulite-facies, sapphirine-bearing, Al–Mg–Fe-rich and silica-poor lens-shaped layers within the Bamble Sector, south Norway. Primary assemblages, indicating peak metamorphic conditions of 773-844°C at 7 kbar (Mg–Fe exchange thermometry), are spinel–sapphirine–biotite–gedrite, spinel–corundum–sapphirine–cordierite and orthopyroxene–biotite–cordierite–plagioclase. Högbomite formed by hydrous alteration and oxidation of primary spinel and rutile and/or ilmenite according to the generalised reaction:

Suggested conditions of högbomite formation are 550–620°C and 6–7 kbar. The högbomites contain 10.2–14.7 wt.% MgO, 04).3 wt.% ZnO, 58.9–62.1 wt.% Al2O3 and 15.6-17.6 wt.% Fe as FeO. The two högbomite may belong to different polytypes, as suggested by their differing TiO2 (9.9-10.1 versus 5.7–5.8 wt. %) and calculated Fe3+ – and H2O–contents. The partitioning of Zn between spinel and högbomite is not uniform and is considered to depend upon prevailing fo2 and aH2O.

Type
Mineralogy
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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Footnotes

*

Present address: Forschergruppe Hochdruck Metamorphose. Institut ftir Mineralogie, Ruhr-Universität Bochum. Postfach 102148. W-4630 Bochum 1. Germany.

**

Present address: Mineralogisch-Petrographisches Institut. Albertstrasse 236. W-7800 Freiburg, Germany.

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