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Abstract:

Mafic volcanism of Paleocene age was recently reported in the Valle del Cura region and the El Indio Belt in the aphanitic and very homogenous well-preserved lavas flows of the Río Frío Basalts unit. These are high-K basalts, with high Fe2O3 and TiO2 contents that imply an alkaline tendency and show typical intraplate-type patterns on a MORB normalized trace elements plot. Sr and Nd isotopic ratios evidence a mantle affinity. The chemistry indicates that these rocks are high temperature melts that result from a low degree of melting of an enriched portion of lithospheric mantle, with no contamination from crustal derived components. The alkaline back-arc Las Máquinas Basalts of Lower Miocene age are derived from more primitive magmas closer to the original source. Mantle composition was relatively constant from Paleocene to Lower Miocene in the studied latitudes over the Pampean flat-slab. Both mafic units share the isotopic trend of pre-Miocene mafic lavas from the Central Andes that were not affected by crustal contamination. Post-Miocene mafic lavas show a strong influence from crust-related processes. © 2010 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Geochemistry of mafic Paleocene volcanic rocks in the Valle del Cura region: Implications for the petrogenesis of primary mantle-derived melts over the Pampean flat-slab
Autor:Litvak, V.D.; Poma, S.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pabellón II, C1428EHA, Argentina
Palabras clave:Geochemistry; Mafic volcanism; Mantle; Tertiary; Valle del Cura; geochemistry; isotopic composition; mafic rock; mid-ocean ridge basalt; Paleocene; Tertiary; trace element; volcanic rock; volcanism; Argentina; El Indio-Pascua Belt; San Juan [Argentina]; Valle del Cura; Cura
Año:2010
Volumen:29
Número:3
Página de inicio:705
Página de fin:716
DOI: http://dx.doi.org/10.1016/j.jsames.2010.01.001
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v29_n3_p705_Litvak

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Citas:

---------- APA ----------
Litvak, V.D. & Poma, S. (2010) . Geochemistry of mafic Paleocene volcanic rocks in the Valle del Cura region: Implications for the petrogenesis of primary mantle-derived melts over the Pampean flat-slab. Journal of South American Earth Sciences, 29(3), 705-716.
http://dx.doi.org/10.1016/j.jsames.2010.01.001
---------- CHICAGO ----------
Litvak, V.D., Poma, S. "Geochemistry of mafic Paleocene volcanic rocks in the Valle del Cura region: Implications for the petrogenesis of primary mantle-derived melts over the Pampean flat-slab" . Journal of South American Earth Sciences 29, no. 3 (2010) : 705-716.
http://dx.doi.org/10.1016/j.jsames.2010.01.001
---------- MLA ----------
Litvak, V.D., Poma, S. "Geochemistry of mafic Paleocene volcanic rocks in the Valle del Cura region: Implications for the petrogenesis of primary mantle-derived melts over the Pampean flat-slab" . Journal of South American Earth Sciences, vol. 29, no. 3, 2010, pp. 705-716.
http://dx.doi.org/10.1016/j.jsames.2010.01.001
---------- VANCOUVER ----------
Litvak, V.D., Poma, S. Geochemistry of mafic Paleocene volcanic rocks in the Valle del Cura region: Implications for the petrogenesis of primary mantle-derived melts over the Pampean flat-slab. J. South Am. Earth Sci. 2010;29(3):705-716.
http://dx.doi.org/10.1016/j.jsames.2010.01.001