Early Ordovician magmatism in the Sierra de Ancaján, Sierras Pampeanas, Argentinaimplications for the early evolution of the proto‑Andean margin of Gondwana

  1. Priscila S. Zandomeni 1
  2. Sebastián O. Verdecchia 1
  3. Edgardo G. Baldo 1
  4. Carmen Galindo 2
  5. Juan A. Moreno 1
  6. Juan A. Dahlquist 1
  7. César Casquet 2
  8. Matías M. Morales Cámera 1
  9. Miguel A. S. Basei 3
  10. Carlos D. Ramacciotti 1
  1. 1 Universidad Nacional de Córdoba
    info

    Universidad Nacional de Córdoba

    Córdoba, Argentina

    ROR https://ror.org/056tb7j80

  2. 2 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  3. 3 Universidade de São Paulo
    info

    Universidade de São Paulo

    São Paulo, Brasil

    ROR https://ror.org/036rp1748

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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: 39-63

Tipo: Artículo

DOI: 10.1007/S41513-020-00141-0 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

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

Resumen

El plutón Ancaján es un cuerpo ígneo elongado, de reducidas dimensiones (ca. 5.34 km2) y composición granodiorítica a monzogranítica que aflora en la Sierra de Ancaján (Sierras Pampeanas Orientales), intruyendo a mármoles y rocas metasedimentarias de la serie Ancaján de edad Ediacarense. Nuevas dataciones de U–Pb en circón realizadas en una muestra granodiorítica mediante SHRIMP y LA-MC-ICP-MS indican una probable edad de cristalización Ordovícica de unos 473 Ma. También se han registrado circones heredados de edades Cámbricas, Neoproterozoicas, Mesoproterozoicas y Paleoproterozoicas. Los granitoides de Ancaján son calcoalcalinos, magnesianos y ligeramente peraluminosos con contenidos medios a altos de K2O (2.44–3.74% en peso) y altos de Na2O (4.05–4.51% en peso). Estas características geoquímicas son comparables a las del magmatismo sódico de tipo TTG Ordovícico del Dominio de Antepaís Famatiniano (FFD) de las Sierras de Córdoba. En consecuencia, el pluton Ancaján podría representar el afloramiento más septentrional de dicho magmatismo. Los datos isotópicos (Sr/Sri = 0.7052–0.7055; εNdi = − 0.7 to − 0.4; TDM = 1.24–1.27 Ga) junto con la presencia de circones heredados, sugieren que el magma parental resultó de la fusión parcial de una fuente combinada, que estaría formada principalmente por un manto subcontinental más viejo con una composición que correspondería a una litosfera oceánica máfica-ultramáfica, junto con el reciclado/asimilación de corteza continental que involucraría granitoides Pampeanos y/o protolitos sedimentarios de edad Ediacarense a Cámbrica. Esta interpretación coincide con la postulada para los granitoides Ordovícicos ricos en Na de las Sierras de Córdoba. Las evidencias presentadas en este trabajo indican que las rocas metasedimentarias que afloran en la Sierra de Ancaján formaron parte de la placa continental superior durante la subducción Famatiniana, corroborando así, la imbricación previa de las series Ancaján y Puncoviscana durante la Orogenia Pampeana de edad Cámbrico temprano.

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Fuente de los datos: Dialnet