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

M. D. Ruiz-Cruz, C. Sanz de Galdeano and Sergey Krivovichev
Diamond and coesite in ultrahigh-pressure-ultrahigh-temperature granulites from Ceuta, northern Rif, northwest Africa
Mineralogical Magazine (June 2012) 76 (3): 683-705

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 mu m across in garnet, K-feldspar, coesite relics and quartz. Thermobarometric estimates yield P >4.3 GPa and T >1100 degrees 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.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 76
Serial Issue: 3
Title: Diamond and coesite in ultrahigh-pressure-ultrahigh-temperature granulites from Ceuta, northern Rif, northwest Africa
Affiliation: Universidad de Malaga, Departamento de Quimica Inorganica, Cristalografia y Mineralogia, Malaga, Spain
Pages: 683-705
Published: 201206
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 84
Accession Number: 2012-092177
Categories: Igneous and metamorphic petrologyGeneral mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N34°00'00" - N36°00'00", W06°34'60" - W02°04'60"
Secondary Affiliation: Universidad de Granada, ESP, Spain
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201248
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