Inorganic geochemistry of Miocene sediments from the Lower Chelif Basin (NW Algeria) for approaching weathering and palaeoclimatic conditions

  1. Fatiha Hadji 1
  2. Abbas Marok 1
  3. Ali Mokhtar Samet 2
  4. Matías Reolid 3
  5. Kamar Eddine Bensefa 1
  1. 1 University of Tlemcen
  2. 2 Université Hassiba Benbouali de Chlef
    info

    Université Hassiba Benbouali de Chlef

    Chlef, Argelia

    ROR https://ror.org/04yymzm67

  3. 3 Universidad de Jaén
    info

    Universidad de Jaén

    Jaén, España

    ROR https://ror.org/0122p5f64

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

ISSN: 1886-7995,  1698-6180

Año de publicación: 2024

Volumen: 50

Número: 2

Páginas: 137-156

Tipo: Artículo

DOI: 10.1007/S41513-024-00236-Y DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

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

Resumen

Se han llevado a cabo los análisis químicos de elementos mayoritarios y traza de los sedimentos miocenos de tres secciones estratigráfcas de la Cuenca del Bajo Chelif en el Norte de Argelia. El registro de indicadores geoquímicos demuestra que la Cuenca del Bajo Chelif ha experimentado una meteorización entre débil y moderada y los valores del Índice de Variación Composicional sugieren que estos sedimentos estaban, en general, enriquecidos en minerales petrogenéticos. Los diagramas Al2O3 vs. K2O muestran que, durante el Mioceno, el principal mineral que contiene Al3+ y K+ fue la ilita, probablemente originada por alteración de feldespato potásico. La aplicación del diagrama Al2O3 vs TiO2, como indicador de procedencia apunta a que todas las muestras caen en la línea que separa los campos de basalto y riolita/granito, lo que indica que el sedimento deriva de una fuente mixta con una composición que varía entre una fuente de rocas máfcas y félsicas. Comparado con la composición promedio de la corteza continental superior (UCC), los sedimentos miocenos muestran un fuerte empobrecimiento en SiO2, Al2O3, MnO, Na2O, K2O, Zr y Sr producido durante la meteorización así como un enriquecimiento en Cr y Cu. Los diagramas de porcentaje de variación de los distintos elementos respecto a la UCC frente al índice de alteración química (CIA) proporcionan la base para comprender la movilidad química durante la meteorización en la Cuenca del Chelif. Para el intervalo estratigráfco estudiado el Si, Al, Mn, Nay K muestran empobecimiento respecto al Ti. El Na decrece más rápidamente que el K, sugiriendo una mayor alteración de la plagioclasa sódica que del feldespato potásico. Para el Tortoniense, la movilidad de Rb y K está claramente relacionada (r = 0.72), con una menor disminución del Rb. Los valores del índice-C (C-proxy) sugieren un ambiente entre semiárido y semihúmedo durante el BurdigalienseLangiense, entre árido y semiárido para el Tortoniense y más húmedo durante el Messiniense. La relación Sr/Ba, que varía entre 0.44 y 6.48, indica un paleoambiente con variable salinidad durante el Mioceno.

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