Search Results - "Conceição, R.V."

The lherzolite–websterite xenolith suite from Northern Patagonia (Argentina): Evidence of mantle–melt reaction processes by Dantas, C., Grégoire, M., Koester, E., Conceição, R.V., Rieck, N.

“…A suite of mantle ultramafic xenoliths hosted in Cenozoïc alkali basalts and pyroclastic rocks associated with a back-arc tectonic environment occur at Cerro…”
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Mantle processes in an Archean orogen: Evidence from 2.67 Ga diamond-bearing lamprophyres and xenoliths by Wyman, D.A., Ayer, J.A., Conceição, R.V., Sage, R.P.

“…The world's oldest diamond deposits occur in ∼2.67 Ga dikes and heterolithic breccias emplaced into greenstone belts of the Wawa and Abitibi Subprovinces,…”
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Andean subduction-related mantle xenoliths: Isotopic evidence of Sr–Nd decoupling during metasomatism by Conceição, R.V., Mallmann, G., Koester, E., Schilling, M., Bertotto, G.W., Rodriguez-Vargas, A.

“…Sr–Nd isotopic analyses on some mantle xenolith samples from the Northern, Southern and Austral Andean volcanic zones exhibit radiogenic Sr enrichment without…”
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Spinel-facies mantle xenoliths from Cerro Redondo, Argentine Patagonia: Petrographic, geochemical, and isotopic evidence of interaction between xenoliths and host basalt by Schilling, M., Conceição, R.V., Mallmann, G., Koester, E., Kawashita, K., Hervé, F., Morata, D., Motoki, A.

“…Cerro Redondo is an ancient cinder cone now almost completely eroded, sited over a sill that corresponds to a sub-volcanic magma chamber, in Santa Cruz…”
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Mantle diversity beneath the Colombian Andes, Northern Volcanic Zone: Constraints from Sr and Nd isotopes by Rodriguez-Vargas, A., Koester, E., Mallmann, G., Conceição, R.V., Kawashita, K., Weber, M.B.I.

“…In order to provide mantle and crustal constraints during the evolution of the Colombian Andes, Sr and Nd isotopic studies were performed in xenoliths from the…”
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An experimental study on smectites as nitrogen conveyors in subduction zones by Cedeño, D.G., Conceição, R.V., Souza, M.R.W., Quinteiro, R.V.S., Carniel, L.C., Ketzer, J.M.M., Rodrigues, F., Bruzza, E.C.

“…We performed high pressure and high temperature (HPHT) experiments on NH4-doped montmorillonite (~2 wt% of NH4) under pressures of 2.5, 4.0, and 7.7 GPa and…”
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Geochemistry and radiogenic isotope characteristics of xenoliths in Archean diamondiferous lamprophyres: Implications for the Superior Province cratonic keel by Wyman, D.A., Hollings, P., Conceição, R.V.

“…Xenoliths retrieved from lamprophyric hosts in the Michipicoten belt fall into four groups defined by Al–Mg contents but do not include mantle peridotite…”
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Magmatic evolution of ediacaran alkali rhyolites from the Acampamento Velho volcanism in the Tupanci area, southern Brazil: A study based on mineral chemistry, LA-ICP-MS Ti-in-quartz and zircon saturation geothermometry by Leitzke, F.P., Gervasoni, F., Simões, M.S., Sommer, C.A., de Lima, E.F., Conceição, R.V.

“…Post-eruptive, metamorphic, and weathering processes are issues that affect not only the identification of geochemical signature but also mineral paragenesis…”
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The role of celadonite on mantle metasomatism in subduction settings by Quinteiro, R.V.S., Conceição, R.V., Carniel, L.C., Leitzke, F.P., Cunha, J.B.M., Souza, M.R., Gomes, M.E.B.

“…Celadonite is the most abundant K-rich hydrated mineral formed during basalt alteration. In convergent margins, celadonite from the altered oceanic crust sinks…”
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Derivation of potassic (shoshonitic) magmas by decompression melting of phlogopite+pargasite lherzolite by Conceição, R.V, Green, D.H

“…A model metasomatized lherzolite composition contains phlogopite and pargasite, together with olivine, orthopyroxene, clinopyroxene and spinel or garnet as…”
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Sm–Nd isotope geochemistry of metamorphic volcano-sedimentary successions in the São Gabriel Block, southernmost Brazil: evidence for the existence of juvenile Neoproterozoic oceanic crust to the east of the Rio de la Plata craton by Saalmann, K., Hartmann, L.A., Remus, M.V.D., Koester, E., Conceição, R.V.

“…Juvenile Neoproterozoic dioritic, tonalitic, trondhjemitic and granodioritic gneisses in the São Gabriel block, southern Brazil, have been identified by…”
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Experimental evidence regarding the pressure dependence of fission track annealing in apatite by Schmidt, J.S., Lelarge, M.L.M.V., Conceicao, R.V., Balzaretti, N.M.

“…The main purposes of fission track thermochronology are unravelling the thermal histories of sedimentary basins, determining uplift and denudation rates,…”
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Ethanolysis Optimisation of Jupati ( Raphia taedigera Mart .) Oil to Biodiesel Using Response Surface Methodology by Conceição, Leyvison R. V. da, Costa, Carlos E. F. da, Rocha Filho, Geraldo N. da, Pereira-Filho, Edenir R., Zamian, José R.

“…In this work, the transesterification of jupati ( Raphia taedigera Mart. ) oil using ethanol and acid catalyst was examined. The production of biodiesel was…”
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