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Carbon in igneous minerals of granulites from Rogaland (Norway); nuclear microanalysis and isotope geochemistry

Edith Wilmart, Michelle Mosbah and Francoise Pineau
Carbon in igneous minerals of granulites from Rogaland (Norway); nuclear microanalysis and isotope geochemistry
European Journal of Mineralogy (April 1993) 5 (2): 269-280

Abstract

The occurrence of carbon is reported in zircons, olivines and spinels from three acidic igneous rocks from the Bjerkreim-Sokndal lopolith which crystallized at function signO (sub 2) close to FMQ buffer conditions. Up to 6600 +- 990 ppm of C were measured from the zircon sub-surface down to 5 mu m deep through the reaction (super 12) C(d,rho (sub 0) ) (super 13) C. In olivine and magnetite C contents of several hundred ppm were detected. To study the localization of C, X-ray photo-electron spectroscopy, SEM, TEM and isotopic analysis methods were used. In zircon, the C may be present in three forms: 1) as thin coatings of carbonates on crystal surfaces and microfracture walls; 2) as minute graphite inclusions, and 3) as carbonaceous films. This last species accounts for 65-75% of the total C extracted from zircon; it was probably formed by the reduction of fluids on microcracks produced during cooling.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 5
Serial Issue: 2
Title: Carbon in igneous minerals of granulites from Rogaland (Norway); nuclear microanalysis and isotope geochemistry
Affiliation: Universite de Paris VII, Institut de Physique du Globe, Paris, France
Pages: 269-280
Published: 199304
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 27
Accession Number: 1993-010397
Categories: Isotope geochemistryMineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 1 table
N58°16'60" - N59°49'60", E04°54'00" - E07°13'60"
Secondary Affiliation: CEA/DSM/DRECAM, 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: 1993
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