单词	pyroclastic
释义	pyroclastic /ˌpʌɪrə(ʊ)ˈklastɪk / Geology adjective Relating to, consisting of, or denoting fragments of rock erupted by a volcano: pyroclastic material... In practice pyroclastic and volcaniclastic rocks include all the products of extrusive volcanic activity except lava flows. Samples of pyroclastic rocks were examined in thin section. Erosion of old lava dome complexes has resulted in deep valleys that dissect pyroclastic and volcanoclastic fans. plural noun (pyroclastics) Pyroclastic fragments: the eruption of lavas and pyroclastics... Voluminous quantities of Late Ordovician to Wenlockian felsic pyroclastics and lava flows record the extensive volcanism associated with the collision and deformation. Derivatives pyroclast /ˈpʌɪrə(ʊ)klast / noun ... Eruption at the surface then yields initial tephrite, typically erupted as pyroclasts. These fluids altered and metasomatized the previously emplaced volcanic products (lavas, pyroclasts).
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