Las traquitas de Arenys d'Empordá (Alt Empordá, NE de la Península Ibérica): características generales

Abstract

A new outcrop of neogene trachytic rocks has been found at Arenys d'Emporda (Alt Emporda, NE Spain). These trachytes and the associated alkali basalts must be related to the Vilopriu set of faults. The trachytes are mainly holocrystalline, glomeroporphyritic and microlitic in texture. Whole rock geochemistry shows that these rocks are potassic trachytes and quite homogeneous in composition. Available data on mineral chemistry (phenocrysts: andesine-oligoclase Pig mantled by K-anortoclase or Na-Sanidine, flogopite, oxidized kaersutite, apatite; microliths of andesine and Na-sanldine) and modal distribution allows a fair distinction when compared with the Vilacolum trachytes