autobrecciation

autobrecciation

[¦ȯd·ō‚brech·ē′ā·shən]
(geology)
The process whereby portions of the first consolidated crust of a lava flow are incorporated into the still-fluid portion.
References in periodicals archive ?
Based on textural evidence, including autobrecciation, coupled with rheological and thermal modeling calculations for the 5 m-wide dyke, it is suggested that fluidization (vapour exsolution) of the magma was key to its rapid emplacement as a quenched glass-gas mixture (tuffisite).
5) Autobrecciation along the margins of the dyke, subrounded fragments, subhedral to rounded and fragmented plagioclase and quartz phenocrysts (phenoclasts), and the autometasomatic effects of deuteric fluids support fluidization (vapour-magma emulsion) as a key emplacement mechanism for the dyke, i.