Petrologic and geothermobarometric investigations in the Kasai gabbro-noritic complex and associated metadolerite dykes (Zaire)

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Authors:Bingen, B.; Demaiffe, D.; Delhal, J.
Author Affiliations:Primary:
Univ. Libre Bruxelles, Lab. Géol.-Pétrol.-Géochronol., Brussels 1050, Belgium
Volume Title:Bulletin de Minéralogie
Source:Bulletin de Minéralogie, 107(5), p.665-682; S.G.F.-S.F.M.C. Réunion commune, Paris, France, 1983. Publisher: Masson, Paris, France. ISSN: 0180-9210
Publication Date:1984
Note:In English with French summary. 2 p. refs.; illus. incl. 40 anal., 2 tables, sketch map
Summary:In the south of Kasai, Archaean rocks metamorphosed (2800 m.y. ago) in granulite facies conditions include a large basic plutonic gabbro-norite complex with subordinate anorthosite and acidic charnockitic-enderbitic gneisses and granulite-facies metasediments cut by dolerite dykes. In the gabbro-norite complex, the orthopyroxene-clinopyroxene and clinopyroxene-garnet mineral pairs gave an average T of 730 + or - 50°C and the plagioclase- clinopyroxene-orthopyroxene-garnet-quartz assemblages gave a P of 7.0 + or - 0.5 kbar. The development of garnet is controlled by the whole-rock Fe/Mg ratio, the An content of the plagioclase and the amount of normative quartz. [R.A.H.]
Subjects:Facies; Gabbros; Garnet group; Geologic barometry; Geologic thermometry; Granulite facies; Igneous rocks; Metadiabase; Metaigneous rocks; Metamorphic rocks; Metaplutonic rocks; Nesosilicates; Norite; Orthosilicates; Petrology; Plutonic rocks; Silicates; Africa; Central Africa; Congo Democratic Republic; Kasai; Zaire
Abstract Numbers:85M/2089
Record ID:1987011824
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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