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Diamond and coesite in ultrahigh-pressure–ultrahigh-temperature granulites from Ceuta, Northern Rif, northwest Africa

Published online by Cambridge University Press:  05 July 2018

M. D. Ruiz-Cruz  and
C. Sanz de Galdeano
M. D. Ruiz-Cruz*
Affiliation:
Departamento de Química Inorganica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
C. Sanz de Galdeano
Affiliation:
Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada. Facultad de Ciencias, 18071 Granada, Spain
*
E-mail: mdruiz@uma.es
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Abstract

Diamond and coesite occur in granulites of the Internal Zone of the Rif belt in northwest Africa. Diamond, identified by optical microscopy, electron microprobe analysis, Raman spectroscopy, cathodoluminescence and microstructural electron backscattered diffraction, is present as inclusions up to 20 μm across in garnet, K-feldspar, coesite relics and quartz. Thermobarometric estimates yield P >4.3 GPa and T >1100°C, which corresponds to a depth of formation >150 km. The estimates suggest that the diamond-bearing peridotites and adjacent crustal rocks experienced similar P–T conditions. If this is correct, there is an old (undated) core in the Betic–Rif cordillera and the current models of the tectonic evolution of the area, which are based on 'full Alpine' evolution, must be revised. This discovery provides further valuable information about the complex geotectonic environment of the southeast Spain and north Moroccan collisional orogen.

Keywords

backscattered electron diffractiondiamondcoesiteEBSDmetamorphic diamondUHP–UHTBetic-Rif Alpine range
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 3 , June 2012 , pp. 683 - 704
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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