Resumen de Presencia de palygorskita en filones hidrotermales de los basaltos toleíticos del Triásico del Béni Snassen (NE de Marruecos)
S. Ratbi, Joaquín Bastida Cuairan, M. Oujidi
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.
