An ignimbrite is the deposit of a pyroclastic density current, or pyroclastic flow. It is a hot suspension of particles and gases flowing rapidly from a volcano driven by having a greater density than the surrounding atmosphere. New Zealand geologist Patrick Marshall derived the term `ignimbrite` from ‘fiery rock dust cloud’ (from the Latin .....
The rock formed by the widespread deposition and consolidation of ash flows and Nuees Ardentes. The term was originally applied only to densely welded deposits but now includes non-welded deposits.
rock composed of compacted volcanic ejecta (see tuff).[2 related articles]
The rock formed by the widespread deposition and consolidation of ash flows and Nuees Ardentes. The term was originally applied only to densely welded deposits but now includes non-welded deposits.
An igneous rock formed by the lithification of ash flow or pyroclastic flow deposits.
An igneous rock formed by the lithification of volcanic ash and volcanic breccia.
a fine-grained volcanic rock consisting mainly of welded shards of feldspar and quartz. Also called