Presencia de palygorskita en filones hidrotermales de los basaltos toleíticos del Triásico del Béni Snassen (NE de Marruecos)

• Autores: S. Ratbi, Joaquín Bastida Cuairan, M. Oujidi
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 1, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)), págs. 215-218
• Idioma: español
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• Resumen

  • Triassic serie of Beni Snassen Massif presents two sections composed mainly of basalts flows with a carbonade intercalation from the upper Ladinien-lower Carnian, and with two marly formations at bottom and top. The basalts appear eventually as dikes, but the most frequent is the presence of lava flows, cutted by a system of veins with two main sets: N70-90 and N135-160. These basalts of tholeitic affinity and doleritic to microdoleritic texture show a complex mineralógicaI assemblage including primary magmatic minerals: plagioclases, pyroxenes, sanidine, magnetite and ilmenite as well as secondary minerals as calcite, quartz, Fe oxides, mica, chlorite, swelling chlorite, smectite, chlorite-smectite and talc-smectite mixed-layers. Chlorite, quartz, calcite, chlorite-smectite and talc-smectite mixed-layers are present frequently as fillings of amygdales. The vein system show the presence of quartz, calcite, epidote, sepiolite, palygorskite and talc-smectite mixed-layer. The hydrothermal conditions suggested by the presence of macroscopic palygorskite are discuted.