Preliminary results of geochemistry, Sm-Nd and Rb-Sr studies of post-Karoo carbonatite complexes in Southern Africa

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Authors:Ziegler, U. R. F.
Author Affiliations:Primary:
Ittigenstrasse 11, Ittigen, Switzerland
Volume Title:Schweizerische Mineralogische und Petrographische Mitteilungen Bulletin Suisse de Minéralogie et Pétrographie
Source:Schweizerische Mineralogische und Petrographische Mitteilungen = Bulletin Suisse de Minéralogie et Pétrographie, 72(1), p.135-142. Publisher: Stäubli Verlag AG, Zurich, Switzerland. ISSN: 0036-7699
Publication Date:1992
Note:In English; illus., incl. 3 tables, anals.
Summary:The preliminary results presented in this article show that the major and trace element composition of most of the analysed post-Karoo carbonatite complexes of Namibia (Kalkfeld); Zambia (Kaluwe, Chasweta), Malawi (Kangankunde) and Tanzania (Mbeya) is in good agreement with the expected composition for the respective carbonatite types. The chondrite normalized REE patterns of all the analysed carbonatites show a strong LREE/HREE enrichment and the absence of significant anomalies. K-Ar age determinations of the Eisenberg carbonatite (Kalkfeld complex) yielded ages between 153.6 and 172.8 Ma. Rb-Sr and Sm-Nd studies indicate depleted mantle reservoirs for the Kalkfeld, Kaluwe and Kangankunde carbonatites while the Mbeya complex seems to have a Rb-depleted, Nd-enriched reservoir. [J.M.H.]
Subjects:Absolute age; Alkali metals; Alkaline earth metals; Carbonatites; Chemical composition; Complexes; Dates; Genesis; Igneous rocks; Isotopes; Jurassic; K/Ar; Karoo Supergroup; Major elements; Mesozoic; Metals; Migration of elements; Neodymium; Provenance; Rare earths; Rubidium; Samarium; Stable isotopes; Strontium; Trace elements; Africa; East Africa; Malawi; Namibia; Southern Africa; Tanzania; Zambia; Chasweta Complex; Eisenberg Carbonatite; Kalkfeld Complex; Kaluwe Complex; Kangankunde Complex; Mbeya Complex
Abstract Numbers:92M/4378
Record ID:1998009599
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France
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