Geochemical and Sr–Nd isotopic constraints on the petrogenesis of the Tiflet granitoids, Northwestern Moroccan Mesetageological implications

  1. Hind El Haïbi 1
  2. Hassan El Hadi 1
  3. Alfonso Pesquera 2
  4. Abdelfatah Tahiri 3
  5. David Martínez Poyatos 4
  6. Ghalem Zahour 1
  7. Sakina Mehdioui 1
  8. Mounia Tahiri 5
  1. 1 Université Hassan II de Casablanca
    info

    Université Hassan II de Casablanca

    Casablanca, Marruecos

    ROR https://ror.org/001q4kn48

  2. 2 Universidad del País Vasco/Euskal Herriko Unibertsitatea
    info

    Universidad del País Vasco/Euskal Herriko Unibertsitatea

    Lejona, España

    ROR https://ror.org/000xsnr85

  3. 3 Mohammed V University in Rabat
  4. 4 Universidad de Granada
    info

    Universidad de Granada

    Granada, España

    ROR https://ror.org/04njjy449

  5. 5 Cadi Ayyad University
    info

    Cadi Ayyad University

    Marrakech, Marruecos

    ROR https://ror.org/04xf6nm78

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

ISSN: 1886-7995,  1698-6180

Ano de publicación: 2021

Título do exemplar: New developments in Geochemistry. A tribute to Carmen Galindo

Volume: 47

Número: 1-2

Páxinas: 347-365

Tipo: Artigo

DOI: 10.1007/S41513-020-00156-7 DIALNET GOOGLE SCHOLAR lock_openAcceso aberto editor

Outras publicacións en: Journal of iberian geology: an international publication of earth sciences

Resumo

El orógeno Varisco de Marruecos presenta numerosos pequeños cuerpos magmáticos félsicos del Neoproterozoico superior. Los granitoides de Tiflet (Meseta noroccidental de Marruecos) constan de dos cuerpos lenticulares (Taïcha y Sidi BouJemaa) de composición granodiorítica y una edad U–Pb en circones de 609 Ma, que afloran en el corredor BouRegreg de la Meseta septentrional de Marruecos. Ambos granitoides son de tendencia magnesiana y calco-alcalina, mostrando principalmente una afinidad peralumínica pero con una asociación mineral típica de granitoides tipo-I. Las variaciones de los elementos principales reflejan un mayor grado de evolución para Sidi BouJemaa que para el granitoide Taïcha, pero no hay evidencia clara de que estén relacionados por procesos de fraccionamiento. Altas proporciones de (CaO/Na2O), valores bajos de Al2O3/( FeO + MgO + TiO2) y ( Na2O + K2O)/(FeO + MgO + TiO2), junto con relaciones87Sr/ 86Sr iniciales relativamente bajas (0,7054 a 0,7108) y valores negativos de εNd (t) (− 6,52 a − 8,45), indican queestos granitoides pueden haber tenido una fuente predominantemente metaígnea en la corteza inferior o mezclas de corteza continental y litosfera subcontinental, presumiblemente del basamento paleoproterozoico. Espectros de tierras raras con un fraccionamiento LREE/HREE elevado, anomalías bajas en Eu y espectros planos desde el Er hasta el Lu son típicos de granitoides sincolisionales. Por el contrario, los granitoides HKCA postcolisionales están relacionados con un régimen tectónico transtensional, con relaciones 87Sr/86Sr bajas y 143Nd/142Nd altas, que indican una importante contribución del manto.

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