Insights for crystal mush storage utilizing mafic enclaves from the 2011-12 Cordon Caulle eruption.

ABSTRACT: Two distinct types of rare crystal-rich mafic enclaves have been identified in the rhyolite lava flow from the 2011-12 Cordón Caulle eruption (Southern Andean Volcanic Zone, SVZ). The majority of mafic enclaves are coarsely crystalline with interlocking olivine-clinopyroxene-plagioclase textures and irregular shaped vesicles filling the crystal framework. These enclaves are interpreted as pieces of crystal-rich magma mush underlying a crystal-poor rhyolitic magma body that has fed recent silicic eruptions at Cordón Caulle. A second type of porphyritic enclaves, with restricted mineral chemistry and spherical vesicles, represents small-volume injections into the rhyolite magma. Both types of enclaves are basaltic end-members (up to 9.3 wt% MgO and 50-53 wt% SiO₂) in comparison to

SUBMITTER: Winslow H 

PROVIDER: S-EPMC9192606 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature