Search results for "Sr-Nd isotope"

showing 3 items of 3 documents

Noble-gas signature of magmas from a heterogeneous mantle wedge: The case of Stromboli volcano (Aeolian Islands, Italy)

2014

Abstract We report on the variation of the elemental (He, Ne, and Ar) and isotopic (He and Ar) compositions of olivine- and clinopyroxene-hosted fluid inclusions hosted in lavas, pyroclastics, and cumulate xenoliths from the last 60 ka of the eruptive history of Stromboli volcano, Italy. Samples belong to (i) the present-day activity as represented by shoshonitic (SHO) basalts, i.e., pumices with low porphyritic (LP) content and high porphyritic (HP) scoriae; (ii) the subalkaline versus alkaline products erupted at Stromboli during its subaerial history among the extreme magmatic series, i.e., calc-alkaline (CA) and potassic (KS); and (iii) the only known ultramafic cumulates (San Bartolo w…

BasaltOlivineMantle wedgeGeochemistryGeologyengineering.materialFluid inclusionUltramafic cumulatesPorphyritic3He/4He ratioIgneous rockGeochemistry and PetrologyUltramafic rockengineeringSr-Nd isotopeXenolithStromboliMantleMaficGeologyChemical Geology
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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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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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