A volcanic rock consisting essentially of pumice fragments, formed by the consolidation of material deposited by pyroclastic flows.
- ‘Low glass viscosity and rapid welding of ignimbrite would be principally favoured by high-temperature emplacement, alkaline magmatic composition and incomplete degassing.’
- ‘The 7-35 m thick tuff is massive, rhyodacitic, K-feldsparrich and contains abundant siliceous nodules; it is interpreted as an ignimbrite.’
- ‘The unit is an orange/red-weathered ignimbrite, which is generally massive and strongly feldsparphyric.’
- ‘Streaks of crushed pumice are called fiammé and are diagnostic of an ash deposit called an ignimbrite.’
- ‘Significant differential neotectonic rotations are not evident across the NE continuation of this fault but are detected across the Erciyes pull-apart basin in the 2.8 Ma Incesu ignimbrite.’
1930s: from Latin ignis fire + imber, imbr- shower of rain, storm cloud + -ite.