Kaluwe carbonatite, Zambia; an alternative to natrocarbonatite

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doi: 10.1144/gsjgs.147.2.0213
Authors:Ngwenya, B. T.; Bailey, D. K.
Author Affiliations:Primary:
Reading Univ., Dep. Geosci., Reading, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, 147(2), p.213-216. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1990
Note:In English. 16 refs.; illus. incl. 2 tables
Summary: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-CO2, where the CaO/MgO ratio and cooling history have largely determined the crystallization path. [R.A.H.]
Subjects:Alkaline earth metals; Calcification; Carbonatites; Cooling; Crystallization; Electron probe data; Genesis; Igneous rocks; Magmas; Matrix; Melts; Metals; Petrology; Phenocrysts; Strontium; Temperature; Textures; Thermal history; Africa; East Africa; Zambia; CaO-MgO-FeO-CO<2`; Kaluwe Complex; Natrocarbonatite
Abstract Numbers:90M/3457
Record ID:1990036319
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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