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GEOREF RECORD

Chemical fractionation in titaniferous clinopyroxene from Bayuda, Sudan

David C. Almond
Chemical fractionation in titaniferous clinopyroxene from Bayuda, Sudan
The Canadian Mineralogist (December 1988) 26, Part 4: 1027-1035

Abstract

Clinopyroxene in basanites and their late residual fractions from the Bayuda Desert, Sudan, shows initial trends of enrichment in Al and Ti accompanied by decline in Si and the Mg/Fe ratio. During the second stage of fractionation (confined to small volumes of residual magma), there was little variation in Mg/Fe, but a continued increase in Al and Ti led to peak values of >11 wt. % Al (sub 2) O (sub 3) and 6% TiO (sub 2) . Hourglass zonation is characteristic of this stage. A third and final stage is marked by a complete change, toward iron enrichment and lower levels of Al and Ti. Although the late residuals from which these pyroxenes crystallized were highly alkaline, there is only negligible increase in the aegirine component. Textures indicate that the third stage began abruptly, and the mineralogical variations seem to require an increase in ferric/ferrous ratio in the system at that point. [Author's abstract]


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 26, Part 4
Title: Chemical fractionation in titaniferous clinopyroxene from Bayuda, Sudan
Author(s): Almond, David C.
Affiliation: Univ. Kuwait, Dep. Geol., Safat, Kuwait
Pages: 1027-1035
Published: 198812
Text Language: English
Summary Language: French
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 24
Accession Number: 1989-030761
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch map
N08°34'60" - N22°00'00", E22°00'00" - E38°30'00"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1989
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