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O–H–Sr–Nd isotope constraints on the origin of the Famatinian magmatic arc, NW Argentina

Published online by Cambridge University Press:  04 May 2020

P. Alasino Open the ORCID record for P. Alasino [Opens in a new window] ,
C. Casquet ,
C. Galindo ,
R. Pankhurst ,
C. Rapela ,
J. Dahlquist Open the ORCID record for J. Dahlquist [Opens in a new window] ,
C. Recio Open the ORCID record for C. Recio [Opens in a new window] ,
E. Baldo ,
M. Larrovere  and
C. Ramacciotti Open the ORCID record for C. Ramacciotti [Opens in a new window]
P. Alasino*
Affiliation:
Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), Provincia de La Rioja–Universidad Nacional de La Rioja–Servicio Geológico Minero Argentino–Universidad Nacional de Catamarca–Consejo Nacional de Investigaciones Científicas y Técnicas, Entre Ríos y Mendoza, 5301, Anillaco, La Rioja, Argentina Instituto de Geología y Recursos Naturales (INGeReN), Centro de Investigación e Innovación Tecnológica–Universidad Nacional de La Rioja, Avenida Gobernador Vernet y Apóstol Felipe, 5300, La Rioja, Argentina
C. Casquet
Affiliation:
Departamento de Mineralogía y Petrología, Universidad Complutense & Instituto de Geociencias, Consejo Superior de Investigaciones Científicas–Universidad Complutense de Madrid, 28040 Madrid, Spain
C. Galindo
Affiliation:
Departamento de Mineralogía y Petrología, Universidad Complutense & Instituto de Geociencias, Consejo Superior de Investigaciones Científicas–Universidad Complutense de Madrid, 28040 Madrid, Spain
R. Pankhurst
Affiliation:
Visiting Research Associate, British Geological Survey, Keyworth, NottinghamNG12 5GG, UK
C. Rapela
Affiliation:
Centro de Investigaciones Geológicas (CIG), Consejo Nacional de Investigaciones Científicas y Técnicas–Universidad Nacional de La Plata, Calle 1 No. 644, 1900, La Plata, Argentina
J. Dahlquist
Affiliation:
Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Física y Naturales, Córdoba, Argentina Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), Consejo Nacional de Investigaciones Científicas y Técnicas–Universidad Nacional de Córdoba, Córdoba, Argentina
C. Recio
Affiliation:
Área de Petrología y Geoquímica, Departamento de Geología, Universidad de Salamanca, Plaza de los Caídos, S/N E-37008 Salamanca, Spain
E. Baldo
Affiliation:
Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Física y Naturales, Córdoba, Argentina Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), Consejo Nacional de Investigaciones Científicas y Técnicas–Universidad Nacional de Córdoba, Córdoba, Argentina
M. Larrovere
Affiliation:
Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), Provincia de La Rioja–Universidad Nacional de La Rioja–Servicio Geológico Minero Argentino–Universidad Nacional de Catamarca–Consejo Nacional de Investigaciones Científicas y Técnicas, Entre Ríos y Mendoza, 5301, Anillaco, La Rioja, Argentina Instituto de Geología y Recursos Naturales (INGeReN), Centro de Investigación e Innovación Tecnológica–Universidad Nacional de La Rioja, Avenida Gobernador Vernet y Apóstol Felipe, 5300, La Rioja, Argentina
C. Ramacciotti
Affiliation:
Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Física y Naturales, Córdoba, Argentina Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), Consejo Nacional de Investigaciones Científicas y Técnicas–Universidad Nacional de Córdoba, Córdoba, Argentina
*
Author for correspondence: P. Alasino, Email: palasino@conicet.gov.ar
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Abstract

We report a study of whole-rock O–H–Sr–Nd isotopes of Ordovician igneous and metamorphic rocks exposed at different crustal palaeodepths along c. 750 km in the Sierras Pampeanas, NW Argentina. The isotope compositions preserved in the intermediate rocks (mostly tonalite) (average δ18O = +8.7 ± 0.5‰, δD = −73 ± 14‰, 87Sr/86Srt = 0.7088 ± 0.0001 and εNdt = −4.5 ± 0.6) show no major difference from those of most of the mafic rocks (average δ18O = +8 ± 0.8‰, δD = −84 ± 18‰, 87Sr/86Srt = 0.7082 ± 0.0016 and εNdt = −4 ± 1.1), suggesting that most of their magmas acquired their crustal characteristics in the mantle. The estimate of assimilation of crustal material (δ18O = +12.2 ± 1.7‰, δD = −89 ± 21‰, 87Sr/86Srt = 0.7146 ± 0.0034 and εNdt = −6.9 ± 0.7) by the tonalite is in most samples within the range 10–20%. Felsic magmas that reached upper crustal levels had isotope values (δ18O = +9.9 ± 1.5‰, δD= −76 ± 5‰, 87Sr/86Srt = 0.7067 ± 0.0010, εNdt = −3.5 ± 1.4) suggesting that they were not derived by fractionation of the contaminated intermediate magmas, but evolved from different magma batches. Some rocks of the arc, both igneous (mostly gabbro and tonalite) and metamorphic, underwent restricted interaction with meteoric fluids. Reported values of δ18O of magmatic zircons from the Famatinian arc rocks (+6 to +9‰) are comparable to our δ18O whole-rock data, indicating that pervasive oxygen isotope exchange in the lower crust was not a major process after zircon crystallization.

Keywords

Famatinian arc magmatismstable and radiogenic isotopescontinental growthnon-homogenized magmatic system
Type
Original Article
Information
Geological Magazine , Volume 157 , Issue 12 , December 2020 , pp. 2067 - 2080
Copyright
© Cambridge University Press 2020

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Footnotes

†

Deceased

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