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Petrology and geodynamic significance of deerite-bearing metaquartzites from the Escambray Massif, Cuba

Published online by Cambridge University Press:  05 July 2018

C. Grevel ,
W. V. Maresch ,
K.-P. Stanek ,
F. Grafe  and
S. Hoernes
C. Grevel
Affiliation:
Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany
W. V. Maresch*
Affiliation:
Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany
K.-P. Stanek
Affiliation:
Institut für Geologie, TU Bergakademie Freiberg, Bernhard-von-Cotta-Str. 2, D-09596 Freiberg, Germany
F. Grafe
Affiliation:
Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany
S. Hoernes
Affiliation:
Mineralogisch-Petrographisches Institut und Museum, Poppelsdorfer Schloss, D-53115 Bonn, Germany
*
*E-mail: walter.v.maresch@ruhr-uni-bochum.de
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Abstract

Deerite, a typical mineral of Fe-rich metacherts metamorphosed under blueschist conditions, is not rare, but known occurrences have up to now been restricted mainly to the Tethyan collisional zone and the Western Cordillera of North America. We describe a first occurrence in the high-pressure nappes of the Escambray Massif, Cuba, in the assemblage deerite + Mg-Al-poor riebeckite + magnetite + quartz ± garnet ± phengite ± aegirine. This assemblage typically forms during exhumation and accompanies late, stress-free annealing of the quartz matrix. Mg-Al-poor riebeckite overgrows older, large, oriented crystals of glaucophane, ferroglaucophane and Mg-Al-rich riebeckite (‘crossite’) during deerite formation. Early-formed hematite was largely replaced by magnetite. Deerite is very close to ideal composition, attaining >99% Si12O40(OH)5, allowing direct application of the experimentally determined P-T-fO2 stability field (Lattard and Le Breton, 1994). In combination with oxygen-isotope thermometry on magnetite-quartz, the crystallization conditions of the deerite-bearing assemblage can be constrained to ∼470°C, >15 kbar, and an oxygen fugacity restricted closely to the quartz-fayalite-magnetite buffer (fO2 ≈ 10−23 bar). Thus, the late-stage P-T path ofthe metacherts mirrors a steep P-T gradient of 10°C/km or less, requiring subduction ofthis part ofthe Antillean Island Arc to be still active during exhumation of the Escambray nappes.

Keywords

deeritehigh-pressure metamorphsmmetaquartziteEscambray MassifCubaoxygen-isotope thermometry
Type
Research Article
Information
Mineralogical Magazine , Volume 70 , Issue 5 , October 2006 , pp. 545 - 564
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2006

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Footnotes

†

present address: TÜV Rheinland, Am Grauen Stein, D-51105 Cologne, Germany

‡

present address: IBeWa Consulting, Lessingstraße 46, D-09599 Freiberg, Germany

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