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Petrology and thermobarometric estimates for metasediments, orthogneisses, and eclogites from the Nevado-Filabride Complex in the western Sierra Nevada (Betic Cordillera, Spain)

Maria Dolores Ruiz-Cruz, Carlos Sanz de Galdeano and Angel Santamaria
Petrology and thermobarometric estimates for metasediments, orthogneisses, and eclogites from the Nevado-Filabride Complex in the western Sierra Nevada (Betic Cordillera, Spain)
The Canadian Mineralogist (November 2015) 53 (6): 1083-1107

Abstract

Using PERPLE_X and garnet isopleth thermobarometry we tested whether Permian metasediments, orthogneisses, and amphibolitized eclogites from the Nevado-Filabride Complex in the western Sierra Nevada (Betics, Spain) underwent the same high-pressure metamorphism, or whether the different lithologies were tectonically emplaced after metamorphism as is commonly assumed. Our results highlight the role of some accessory minerals, especially small inclusions of Ti-bearing phases (mainly titanite and rutile) in garnet, in the thermobarometric estimates and indicate the presence of several populations of garnets in the orthogneisses-recording different stages of the prograde and retrogressive Alpine metamorphic path-in addition to pre-Alpine garnets. The schists also contain two populations of garnet: rare detrital grains and metamorphic crystals. Despite the scarcity of key phases proving that the orthogneisses and metasediments experienced high-pressure conditions, this study yields a number of lines of evidence suggesting that both rock types followed a clockwise pressure-temperature path similar to the eclogites, reaching peak pressures of 2.0-2.2 GPa for temperatures of 550-600 degrees C, and that the lithologies were all in contact prior to the high-pressure Alpine event.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 53
Serial Issue: 6
Title: Petrology and thermobarometric estimates for metasediments, orthogneisses, and eclogites from the Nevado-Filabride Complex in the western Sierra Nevada (Betic Cordillera, Spain)
Affiliation: Universidad de Malaga, Departamento de Quimica Inorganica Cristalografia y Mineralogia, Malaga, Spain
Pages: 1083-1107
Published: 201511
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 65
Accession Number: 2016-096745
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, sketch map
N36°00'00" - N38°49'60", W07°30'00" - W00°40'00"
Secondary Affiliation: Universidad de Granada, ESP, Spain
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201647
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