Skip to Main Content
GEOREF RECORD

Petrological study of high-temperature granulites from In Ouzzal, Algeria; some implications on the phase relationships in the FMASTOCr systems

Michel Guiraud, Jean-Robert Kienast and Amel Rahmani
Petrological study of high-temperature granulites from In Ouzzal, Algeria; some implications on the phase relationships in the FMASTOCr systems
European Journal of Mineralogy (December 1996) 8 (6): 1375-1390

Abstract

These granulites preserve excellent indicators of high-T conditions; they display a series of reaction textures involving sapphirine, sillimanite, spinel, garnet and cordierite, in addition to orthopyroxene, quartz and rutile. Geothermometry and geobarometry indicate peak metamorphic conditions of 1000 degrees C and 10-11 kbar. As most of the minerals contain appreciable Fe (super 3+) and Cr, the parageneses have been studied within the system FeO-MgO-Al (sub 2) O (sub 3) -SiO (sub 2) -TiO (sub 2) -OMV2-Cr (sub 2) O (sub 3) ; however, the colinearity of sillimanite, sapphirine and orthopyroxene (Al (sub 2) O (sub 3) 2.54-9.73 wt.%) lead to a different compatibility diagram from that of previous authors. A new set of petrogenetic grids have therefore been developed for the FMASTO system with sapphirine, spinel, sillimanite, garnet, cordierite, magnetite, ilmenite, and rutile in the presence of quartz and orthopyroxene. The new grids account for the parageneses observed in the Khanfous area, N In Ouzzal, and for most of the recorded high-T granulites.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 8
Serial Issue: 6
Title: Petrological study of high-temperature granulites from In Ouzzal, Algeria; some implications on the phase relationships in the FMASTOCr systems
Affiliation: Laboratoire de Mineralogie, Museum National d'Histoire Naturelle, Paris, France
Pages: 1375-1390
Published: 199612
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 51
Accession Number: 1997-018112
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch maps
N20°00'00" - N24°00'00", E00°00'00" - E10°00'00"
Secondary Affiliation: Universite de Paris VI, FRA, FranceUniversite de Paris VII, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199706
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal