The Estrechura Andesites from the Middle Rio Chubut Volcanic-Pyroclastic Complex (Paleocene-Middle Eocene)

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Eugenio Aragón
Yolanda E. Aguilera
Vanesa C. Consoli
Claudia E. Cavarozzi
Alejandro Ribot

Abstract

The Estrechura Andesites show a basalt-trachyte tholeiitic transitional trend. Liquid immiscibility is present from basalts to trachytes. Thus, basalts and trachybasalts are interpreted as the fractionating magmas; the trachyandesites are the enriched (mix) residual magma - immiscible liquid; and the trachytes are the segregated immiscible liquid at the magma chamber top. Even though it is a water poor system, the concentration of volatile in one of the immiscible liquids enables few ignimbrite extrusions that carry non-vesiculated perlitic magma blebs in pumice core. The depth of the magma chamber emplacement is estimated to be close to the 4,5 kilometers.

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Aragón, E., Aguilera, Y. E., Consoli, V. C., Cavarozzi, C. E., & Ribot, A. (2004). The Estrechura Andesites from the Middle Rio Chubut Volcanic-Pyroclastic Complex (Paleocene-Middle Eocene). Revista De La Asociación Geológica Argentina, 59(4), 619-633. Retrieved from https://revista.geologica.org.ar/raga/article/view/1438
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