The Faja Eruptiva of the Eastern Puna and the Sierra de Calalaste, NW ArgentinaU-Pb zircon chronology of the early Famatinan orogeny

  1. C. Casquet 1
  2. P. Alasino 2
  3. C. Galindo 1
  4. R. Pankhurst
  5. J. Dahlquist 3
  6. E. G. Baldo 3
  7. C. Ramacciotti 3
  8. S. Verdecchia 3
  9. M. Larrovere 2
  10. C. W. Rapela 4
  11. C. Recio 5
  1. 1 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  2. 2 Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja
  3. 3 Centro de Investigaciones en Ciencias de La Tierra
  4. 4 Centro de Investigaciones Geológicas
  5. 5 Universidad de Salamanca
    info

    Universidad de Salamanca

    Salamanca, España

    ROR https://ror.org/02f40zc51

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Revista:
Journal of iberian geology: an international publication of earth sciences

ISSN: 1886-7995,  1698-6180

Año de publicación: 2021

Título del ejemplar: New developments in Geochemistry. A tribute to Carmen Galindo

Volumen: 47

Número: 1-2

Páginas: 15-37

Tipo: Artículo

DOI: 10.1007/S41513-020-00150-Z DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Journal of iberian geology: an international publication of earth sciences

Resumen

El cinturón Famatiniano es un segmento del orógeno acreccionario ordovícico Terra Australis, que se extendía a lo largo del margen SW de Gondwana desde Australia hasta Colombia. El conocimiento de este cinturón es todavía muy incompleto. En este trabajo se ha realizado geoquímica y geocronología U-Pb SHRIMP en circón en rocas ígneas y metamórficas del Dominio Famatiniano Central (Rapela et al., 2016) en el norte de las Sierras Pampeanas y el sur de la Puna en el noroeste de Argentina. Se han datado y analizado químicamente seis muestras de rocas ígneas (granitoides peraluminosos y rocas volcánicas/subvolcánicas maficas y felsicas) y seis muestras de rocas metasedimentarias asociadas, de la Puna meridional, principalmente. Los resultados indican que el Dominio Famatiniano Central es un dominio compuesto, que incluye un arco magmático de tipo Cordillerano con magmatismo de tipo I (ca. 470 Ma) y un terreno más antiguo, yuxtapuestos en la actualidad mediante fallas ándicas. Este último se formó en un contexto de extensión al comienzo de la orogénesis Famatiniana, entre ca. 480 y 485 Ma., en el margen SO de Gondwana, poco después de que cambiara de pasivo a activo. Este breve período de extensión, con sedimentación relacionada, vulcanismo y, principalmente, plutonismo granitoide, no había sido reconocido previamente y tuvo lugar antes de que se instalara el arco magmático de tipo Cordillerano como resultado de un flare-up magmático entre 473 y 468 Ma, coincidente, a su vez, con una fase de contracción. Esta evidencia confirma que la orogénesis acreccionaria es el resultado de la permutación tectónica (tectonic switching) entre fases de extensión y contracción (pull-push orogeny) y que estas son de duración relativamente corta.

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Información de financiación

Financiadores

  • Ministerio de Ciencia, Innovación y Universidades
    • CGL2016-76439-P
  • FONCyT
    • PICT-0619

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Fuente de los datos: Dialnet