The Las Matras tonalitic-trondhjemitic pluton, Central Argentina: Grenvillian-age constraints, geochemical characteristics, and regional implications

The N–S trending belt with Grenvillian-age rocks developed in central western Argentina represents the basement of an allochthonous terrane derived from Laurentia during the Early Paleozoic. The Las Matras pluton (368460 S, 678070 W) is located at the southern extension of this belt in the Las Matra...

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Detalles Bibliográficos
Autores principales: Sato, Ana María, Tickyj, Hugo, Llambías, Eduardo Jorge, Sato, Kei
Formato: Articulo
Lenguaje:Inglés
Publicado: 2000
Materias:
Ciencias Naturales
Grenville orogeny
Central and western Argentina
Trondhjemites
Terrane accretion
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/127888
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-127888
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Grenville orogeny
Central and western Argentina
Trondhjemites
Terrane accretion
spellingShingle Ciencias Naturales
Grenville orogeny
Central and western Argentina
Trondhjemites
Terrane accretion
Sato, Ana María
Tickyj, Hugo
Llambías, Eduardo Jorge
Sato, Kei
The Las Matras tonalitic-trondhjemitic pluton, Central Argentina: Grenvillian-age constraints, geochemical characteristics, and regional implications
topic_facet Ciencias Naturales
Grenville orogeny
Central and western Argentina
Trondhjemites
Terrane accretion
description The N–S trending belt with Grenvillian-age rocks developed in central western Argentina represents the basement of an allochthonous terrane derived from Laurentia during the Early Paleozoic. The Las Matras pluton (368460 S, 678070 W) is located at the southern extension of this belt in the Las Matras Block. It consists of a low-Al tonalitic to trondhjemitic facies characteristic of an arc magmatism. Isotopic studies yielded Grenvillian Rb–Sr (1212 ^ 47 Ma) and Sm–Nd (1188 ^ 47 Ma) ages which, due to the undeformed and non-metamorphosed character of the pluton, are interpreted to represent a crystallization age of around 1200 Ma. Although this age is slightly older than available dates from other exposures of the same belt, and the undeformed feature is also distinctive for Las Matras, the depleted Sr and Nd isotopic signatures of the pluton agree with those from other magmatic rocks involved in that belt. The differences found between Las Matras and the northern exposures indicate that this belt with Grenvillian-age rocks comprises regions of non-homogeneous evolution. Although the correlation of the Lower Paleozoic platform carbonates from the sedimentary cover of the Grenvillian-age basement rocks suggests the surroundings of the Southern Grenville Province (Texas and northern Mexico) as the probable detachment site for the Argentine belt, comparison of magmatic and tectonic processes involved in these basement rocks does not indicate similar evolutions. This fact can suggest an independent evolution of the Argentine belt prior to amalgamation to the Laurentian Grenville orogen.
format Articulo
Articulo
author Sato, Ana María
Tickyj, Hugo
Llambías, Eduardo Jorge
Sato, Kei
author_facet Sato, Ana María
Tickyj, Hugo
Llambías, Eduardo Jorge
Sato, Kei
author_sort Sato, Ana María
title The Las Matras tonalitic-trondhjemitic pluton, Central Argentina: Grenvillian-age constraints, geochemical characteristics, and regional implications
title_short The Las Matras tonalitic-trondhjemitic pluton, Central Argentina: Grenvillian-age constraints, geochemical characteristics, and regional implications
title_full The Las Matras tonalitic-trondhjemitic pluton, Central Argentina: Grenvillian-age constraints, geochemical characteristics, and regional implications
title_fullStr The Las Matras tonalitic-trondhjemitic pluton, Central Argentina: Grenvillian-age constraints, geochemical characteristics, and regional implications
title_full_unstemmed The Las Matras tonalitic-trondhjemitic pluton, Central Argentina: Grenvillian-age constraints, geochemical characteristics, and regional implications
title_sort las matras tonalitic-trondhjemitic pluton, central argentina: grenvillian-age constraints, geochemical characteristics, and regional implications
publishDate 2000
url http://sedici.unlp.edu.ar/handle/10915/127888
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