Search results for "potassic magmatism"

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Geochemical characteristics of Cretaceous carbonatites from Angola

1999

Abstract The Early Cretaceous (138–130 Ma) carbonatites and associated alkaline rocks of Angola belong to the Parana-Angola-Etendeka Province and occur as ring complexes and other central-type intrusions along northeast trending tectonic lineaments, parallel to the trend of coeval Namibian alkaline complexes. Most of the Angolan carbonatite-alkaline bodies are located along the apical part of the Mocamedes Arch, a structure representing the African counterpart of the Ponta Grossa Arch in southern Brazil, where several alkaline-carbonatite complexes were also emplaced in the Early Cretaceous. Geochemical and isotopic (C, 0, Sr and Nd) characteristics determined for five carbonatitic occurren…

Lineamentgenetic-relationshipsGeologyeastern paraguaypotassic magmatismStructural basintrindade mantle plumeMantle (geology)Cretaceousse brazilsr-nd isotopesPaleontologyTectonicscomplex; eastern paraguay; evolution; genetic-relationships; igneous rocks; northwestern namibia; potassic magmatism; se brazil; sr-nd isotopes; trindade mantle plumenorthwestern namibiaevolutionigneous rocksCarbonatiteMetasomatismcomplexGeologyEarth-Surface ProcessesJournal of African Earth Sciences

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