Whole-rock and Sm–Nd isotopic geochemistry of Triassic SW Iberia sandstonesimplications for provenance

  1. Cristina Gama 1
  2. Manuel Francisco Pereira 1
  3. José Manuel Fuenlabrada 2
  4. Ricardo Arenas 2
  1. 1 Universidade de Évora
    info

    Universidade de Évora

    Évora, Portugal

    ROR https://ror.org/02gyps716

  2. 2 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

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: 189-207

Tipo: Artículo

DOI: 10.1007/S41513-020-00149-6 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

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

Resumen

Se han utilizado datos de geoquímica de roca total y de geoquímica isotópica Sm–Nd para caracterizar las áreas fuentes probables de las areniscas del Triásico del Alentejo y Algarve. Estas rocas fueron depositadas en un contexto de rift y se proyectan dentro del campo reciclado, lo que confirma que proceden de un terreno orogénico reciclado. Todas muestran anomalías negativa de Eu, enriquecimiento en LREE y pautas casi planas de HREE, típicas de áreas fuentes situadas en la corteza continental superior. Sus edades modelo de Nd y sus poblaciones de circones detríticos son significativamente coincidentes con las de las formaciones Filita-Cuarcita y Tercenas del Devónico Superior – Carbonífero Inferior y con las de las turbiditas de la Formación Mira del Carbonífero Inferior, todas ellas situadas en la Zona Sudportuguesa (ZSP), lo que indica que estas pueden haber sido sus áreas fuentes dominantes, con una contribución menor de las turbiditas Viseenses de Mértola. En particular, las turbiditas de Mira pueden considerarse también cómo el área fuente principal de las areniscas Triásicas del sector oriental del Algarve. Además, las edades modelo de Nd y las poblaciones de circones detríticos de las areniscas del Triásico del Algarve central, en comparación con las de las formaciones Brejeira y Ronquillo de la ZSP, depositadas respectivamente en el Carbonífero Superior y Devónico Superior, indican una marcada procedencia a partir de un area fuente subsidente (source-to-sink). Finalmente, algunas de las areniscas Triásicas del Algarve occidental muestran edades modelo de Nd más antiguas, que no se han reconocido en la ZSP, lo que podría indicar que estas rocas sedimentarias derivan directamente de áreas fuentes remotas. Podemos avanzar la sugerencia de que además de áreas fuente remotas localizadas en el Terreno Meguma, otras localizadas en el Orógeno Varisco de Marruecos y generadas mediante reciclado sedimentario también se han identificado en el basamento Devono-Carbonífero de la ZSP. Estas series de la ZSP pueden representar depósitos sedimentarios intermedios, y podrían ser posteriormente retrabajados e incorporados en la cuenca Triásica del Algarve, indicando de este modo una sedimentación multi-ciclo.

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