Search results for "sr-nd isotopes"

showing 2 items of 2 documents

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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Potassic and sodic igneous rocks from eastern Paraguay: their origin from the lithospheric mantle and genetic relationships with the associated Paran…

1997

3 DIPARTIMENTO DI SCIENZE DELLA TERRA, UNIVERSITY OF TRIESTE, VIA E. WEISS 8, I-34127 TRIESTE, ITALY 4 INSTITUTO DE GEOCIENCIAS, UNIVERSIDADE DE SAO PAULO, C.P. 30627, 01051 SAO PAULO, SP, BRAZIL 5 DIPARTIMENTO DI SCIENZE DELLA TERRA, ‘LA SAPIENZA’ UNIVERSITY, PIAZZALE ALDO MORO 5, I-00185, ROME, ITALY 6 ISTITUTO DI MINERALOGIA, PETROGRAFIA E GEOCHIMICA, UNIVERSITY OF PALERMO, VIA ARCHIRAFI 36, I-90100,

PETROLOGIA ÍGNEAIgneous rockSr-Nd isotopesGeophysicsFlood mythalkaline magmatismGeochemistry and PetrologyParaguaypetrogenesisEarth sciencealkaline magmatism; Paraguay; petrogenesis; Sr-Nd isotopesLithospheric mantleGeology
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