pyroclastic rock


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Related to pyroclastic rock: Pyroclast, porphyritic rock, Phreatic eruption

pyroclastic rock

[¦pī·rə¦klas·tik ′räk]
(petrology)
A rock that is composed of fragmented volcanic products ejected from volcanoes in explosive events.
References in periodicals archive ?
We measured these testing samples from the pyroclastic rock mass that crop out at the east of Shaoxing City in Zhejiang Province, China (Figure 4).
The patterns of the predicted prospective target areas for IOCG deposits are defined mostly by neighboring to NE-SW trending faults, vicinity to pyroclastic rocks (mainly tuff) and Au geochemical anomaly (Fig.
& WILLIAMS, H, 1932: The classification and terminology of the pyroclastic rocks.--Bull.
In general, extrusive and pyroclastic rocks that formed on earth's surface have much higher Q values; hypabyssal rocks that formed near the surface have moderate Q values, whereas the plutonic rocks have the lowest Q values (Table 2).
The Beulah Camp Formation comprises reddish-maroon, coarse- to fine-grained felsic and minor mafic pyroclastic rocks, chiefly felsic lithic-crystal tuff.
The fragmented magma gives rise to pyroclastic rocks, not lava flows.
These rocks include basaltic-andesitic lavas volcanoclastic and pyroclastic rocks. The lavas generally have porphyritic texture with phenocrysts of plagioclase hornblende and pyroxene present in the greenish color chlorite mass.
The present study reports the laboratory simulation of the hydrothermal alteration of Neogene sedimentary and pyroclastic rocks exposed around the Sochagota Lake (Paipa, Boyaca) to zeolites to understand the geological conditions controlling their formation.
Apart from magmatic rocks, the Lower Silesian basaltoid formation includes as well pyroclastic rocks, such as: volcanic breccias, tuffs, and tuffites.