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

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...

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Detalles Bibliográficos
Autores principales: Litvak, Vanesa Dafne, Poma, Stella Maris
Publicado: 2010
Materias:
Geochemistry
Mafic volcanism
Mantle
Tertiary
Valle del Cura
geochemistry
isotopic composition
mafic rock
mid-ocean ridge basalt
Paleocene
trace element
volcanic rock
volcanism
Argentina
El Indio-Pascua Belt
San Juan [Argentina]
Cura
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v29_n3_p705_Litvak
http://hdl.handle.net/20.500.12110/paper_08959811_v29_n3_p705_Litvak
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_08959811_v29_n3_p705_Litvak
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spelling paper:paper_08959811_v29_n3_p705_Litvak2023-06-08T15:48:30Z 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 Litvak, Vanesa Dafne Poma, Stella Maris 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 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. Fil:Litvak, V.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Poma, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v29_n3_p705_Litvak http://hdl.handle.net/20.500.12110/paper_08959811_v29_n3_p705_Litvak
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
Litvak, Vanesa Dafne
Poma, Stella Maris
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
topic_facet 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
description 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.
author Litvak, Vanesa Dafne
Poma, Stella Maris
author_facet Litvak, Vanesa Dafne
Poma, Stella Maris
author_sort Litvak, Vanesa Dafne
title 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
title_short 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
title_full 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
title_fullStr 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
title_full_unstemmed 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
title_sort 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
publishDate 2010
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v29_n3_p705_Litvak
http://hdl.handle.net/20.500.12110/paper_08959811_v29_n3_p705_Litvak
work_keys_str_mv AT litvakvanesadafne geochemistryofmaficpaleocenevolcanicrocksinthevalledelcuraregionimplicationsforthepetrogenesisofprimarymantlederivedmeltsoverthepampeanflatslab
AT pomastellamaris geochemistryofmaficpaleocenevolcanicrocksinthevalledelcuraregionimplicationsforthepetrogenesisofprimarymantlederivedmeltsoverthepampeanflatslab
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