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GEOREF RECORD

Magmatic osumilite in an ultrapotassic dyke, southern Peru; first occurrence

Gabriel Carlier, Jean-Pierre Lorand and Jean-Robert Kienast
Magmatic osumilite in an ultrapotassic dyke, southern Peru; first occurrence
European Journal of Mineralogy (October 1994) 6 (5): 657-665

Abstract

Osumilite-Mg, with 0..69 << Mg/(Mg + Fe) << 0.79, has been found in an ultrapotassic lamprophyric rock, 1.5 km NE of the Chili Hacienda, Puno Dept. S Peru. It occurs both as microlites (with up to 10.73 Si pfu) in the groundmass and as partial melting products of magnesian biotite phenocrysts incorporated from peraluminous granite spatially associated with the ultrapotassic rock. The P-T-fO (sub 2) conditions of osumilite deduced from the coexisting mineral assemblage (<< 1-5 kbar, 950-1050 degrees C and fO (sub 2) = WM) are in good agreement with the experimentally determined stability of this mineral. It is considered that osumilite in ultrapotassic rock is symptomatic of alumina-rich siliceous and magnesian melts.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 5
Title: Magmatic osumilite in an ultrapotassic dyke, southern Peru; first occurrence
Affiliation: ORSTOM, TOA, UR, Paris, France
Pages: 657-665
Published: 199410
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 36
Accession Number: 1994-054183
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
S14°17'43" - S14°17'43", W70°30'48" - W70°30'48"
Secondary Affiliation: Laboratoire de Mineralogie du Museum National d'Histoire Naturelle, FRA, FranceUniversite 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: 199424
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