Evolución cronológica y geoquímica de los centros volcánicos de la Cordillera de Los Llanganates : Relación geodinámica y geomorfológica entre estructuras tectónicas recientes del Valle de Latacunga con domos cuaternarios entre Salcedo y San José De Poaló.

Abstract

This study analyzes a complex of Quaternary rhyolitic domes in the Central Interandean Valley of Ecuador. Fieldwork, petrographic and geochemical analysis, Ar-Ar dating, and cartography were used to understand their origin and relationship to regional tectonics. The results reveal that the domes are evolved magmas with high silica content, differentiated by fractional crystallization and assimilation of continental crust. The magma ascent occurred through faults and fractures, with the CCPP system being an important factor. Ar-Ar dating and geochemical affinities suggest a relationship with the andesitic series of Cotopaxi, Pisayambo, and Putzulahua. Two types of rhyolite were identified: crystal-poor and crystal-rich, with different eruptive properties. The study provides valuable information for the assessment of volcanic significance in the region and the understanding of magmatic processes in general.