Geoquímica de los basaltos toleíticos triásicos del Macizo de Beni Snassen (NE de Marruecos)

• Autores: S. Ratbi, Joaquín Bastida Cuairan, Ángel M. López Buendía, Marceliano Lago San José, Carlos Galé Bornao, Enrique Arranz Yagüe
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 1, 3, 2000 (Ejemplar dedicado a: V Congreso Geológico de España (Alicante, 10-14 julio 2000)), págs. 293-298
• Idioma: español
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• Resumen

  • Two basaltic units, with interbedded Ladinian-Carnian marine limestones, were emplaced into Triassic materials of the Beni Snassen Massif (NE Morocco). Mineral (Ol+Cpx+Pl+Mt) and geochemical compositions o f these basalts evidence its tholeiitic affinity and cogenetism, as well as differentiation by fractional crystallization. These basalts were emplaced in a shallow submarine environment, and the extrusion seems to be related to two fracture families, trending N70-N90 and N l 35-N160 respectively. These fractures display a restricted regional development, suggesting an aborted rifting event prior to Liassic sedimentation.