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Thermal maturation of a complete magmatic plumbing system at the Sierra de Velasco, Northwestern Argentina

Published online by Cambridge University Press:  14 August 2020

Marcos Macchioli Grande Open the ORCID record for Marcos Macchioli Grande [Opens in a new window] ,
Pablo Alasino Open the ORCID record for Pablo Alasino [Opens in a new window] ,
Juan Dahlquist Open the ORCID record for Juan Dahlquist [Opens in a new window] ,
Matías Morales Cámera ,
Carmen Galindo  and
Miguel Basei
Marcos Macchioli Grande*
Affiliation:
Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (Provincia de La Rioja – UNLaR – SEGEMAR – UNCa – CONICET), Entre Ríos y Mendoza s/n, 5301Anillaco, Argentina Instituto de Geología y Recursos Naturales, Centro de Investigación e Innovación Tecnológica, Universidad Nacional de La Rioja (INGeReN – CENIIT – UNLaR), Avenida Gobernador Vernet y Apóstol Felipe, 5300La Rioja, Argentina
Pablo Alasino
Affiliation:
Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (Provincia de La Rioja – UNLaR – SEGEMAR – UNCa – CONICET), Entre Ríos y Mendoza s/n, 5301Anillaco, Argentina Instituto de Geología y Recursos Naturales, Centro de Investigación e Innovación Tecnológica, Universidad Nacional de La Rioja (INGeReN – CENIIT – UNLaR), Avenida Gobernador Vernet y Apóstol Felipe, 5300La Rioja, Argentina
Juan Dahlquist
Affiliation:
Centro de investigaciones en Ciencias de la Tierra (CICTERRA – CONICET – UNC), Haya de la Torre s/n, Ciudad Universitaria, X5016CACórdoba, Argentina
Matías Morales Cámera
Affiliation:
Centro de investigaciones en Ciencias de la Tierra (CICTERRA – CONICET – UNC), Haya de la Torre s/n, Ciudad Universitaria, X5016CACórdoba, Argentina
Carmen Galindo
Affiliation:
Departamento de Mineralogía y Petrología, Facultad de Ciencias Geológicas, Instituto de Geociencias (IGEO, CSIC), Universidad Complutense, 28040Madrid, Spain
Miguel Basei
Affiliation:
Instituto de Geociências da Universidade de São Paulo, Rua do Lago 562, 05508-080São Paulo, Brazil
*
Author for correspondence: Marcos Macchioli Grande, Email: [email protected]
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Abstract

The formation of magmatic plumbing systems in the crust involves mass and heat transfer from deep to shallow levels. This process modifies the local geotherm and increases the thermal maturation of the crust, affecting the rheological state of the host rock and the composition of magma. Here, we report a petrological, geochemical, isotopic and geochronological integrated study of the Huaco (354 Ma) and Sanagasta (353 Ma, from a new U–Pb zircon age) units from the Carboniferous (Lower Mississippian) Huaco Intrusive Complex, NW Argentina. Similar values of ϵNdt and δ18O, of −3.2 ± 0.7 and +11.2‰ ± 0.3‰ (V-SMOW), respectively, for both units indicate that they shared the same source, as a result of mixing and later homogenization of a crustal component at the Late Devonian (378 to 366 Ma), with metasomatized mantle-derived melts. Slightly higher contents of TiO2, FeO, MgO, CaO and rare earth elements for the Sanagasta unit in comparison with the Huaco unit suggest an increase in the degree of partial melting, which may have been caused by a higher temperature at the lower crust. In addition, the previous structural model of the Huaco Intrusive Complex points to an increase in thermal maturation in the upper crust, which drives a change in the emplacement style from tabular subhorizontal (Huaco) to vertically elongated (Sanagasta) bodies. Therefore, the evolution of the intrusive complex may reflect a generalized thermal maturation of the complete magmatic column, at both upper and lower crustal levels.

Keywords

Carboniferous magmatismSierras Pampeanasmixing and homogenizationdegree of partial meltingplumbing system
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 3 , March 2021 , pp. 537 - 554
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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Footnotes

†

Deceased

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