Mineralogía de los rellenos vesiculares de la secuencia basáltica entre Bajada del Diablo y Marra-Có, Chubut
2016
In this contribution we describe the
textures and the mineralogy of eocene volcanic
sequences from Bajada del Diablo and Marra-Co,
Chubut province. They are composed of alkali basalt with three different sections. The two upper
ones are characterized by the occurrence of secondary minerals among which amygdules filled by
fibrous aggregates of natrolite are the most common ones. This species not only represents the
last mineral precipitation but also the most important
one. The alteration assemblages of primary minerals as well as the secondary assemblages, that fill
each basalts’ cavities, suggest a very low-grade
hydrothermal alteration with temperatures lower
than 100°C and low silica activity
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