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Kaluwe carbonatite, Zambia; an alternative to natrocarbonatite

B. T. Ngwenya and D. K. Bailey
Kaluwe carbonatite, Zambia; an alternative to natrocarbonatite
Journal of the Geological Society of London (March 1990) 147 (2): 213-216

Abstract

Fine-grained carbonatite in the Kaluwe complex has been inferred, on textural grounds, to be calcified natrocarbonatite. Microprobe analysis, however, shows that the brown laths thought to be pseudo- nyerereite are dolomitic, with Sr values much higher than normal in low-T carbonates. This chemistry effectively rules out near- surface replacement of an original natrocarbonatite; the compositions must closely reflect that of the magma from which they have crystallized. The fabrics observed can be interpreted in terms of the system CaO-MgO-FeO-CO (sub 2) , where the CaO/MgO ratio and cooling history have largely determined the crystallization path.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 147
Serial Issue: 2
Title: Kaluwe carbonatite, Zambia; an alternative to natrocarbonatite
Affiliation: Reading Univ., Dep. Geosci., Reading, United Kingdom
Pages: 213-216
Published: 199003
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 16
Accession Number: 1990-036319
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
S17°00'00" - S08°00'00", E22°00'00" - E33°30'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 1990
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