Dendritic crystallization in hydrous basaltic magmas controls magma mobility within the Earth's crust.

ABSTRACT: The majority of basaltic magmas stall in the Earth's crust as a result of the rheological evolution caused by crystallization during transport. However, the relationships between crystallinity, rheology and eruptibility remain uncertain because it is difficult to observe dynamic magma crystallization in real time. Here, we present in-situ 4D data for crystal growth kinetics and the textural evolution of pyroxene during crystallization of trachybasaltic magmas in high-temperature experiments under water-saturated conditions at crustal pressures. We observe dendritic growth of pyroxene on initially euhedral cores, and a surprisingly rapid increase in crystal fraction and aspect ratio at undercooling ≥30 °C. Rapid dendritic crystallization favours a rheological transition from Newtonian to no

SUBMITTER: Arzilli F 

PROVIDER: S-EPMC9187734 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature