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Pyroclastic-rock

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About Pyroclastic-rockHide

Rocks composed of volcanic fragments derived from explosive volcanic activity. Pyroclastic rocks contain more than 75% by volume of pyroclastic fragments, the remaining materials being generally of epiclastic, organic, chemical sedimentary or authigenic origin. Tephra is the unconsolidated equivalent.


Classification of Pyroclastic-rockHide

64mm)' b='Lapilli (64-2mm)' c='Ash (<2mm)' actions='fill #cccccc 100,0,0 to 75,25,0 to 75,0,25;fill #cccccc 75,25,0 to 75,0,25 to 25,0,75 to 25,75,0;fill #cccccc 0,100,0 to 25,75,0 to 0,75,25;fill #cccccc 0,0,100 to 25,0,75 to 0,25,75;fill #ffcc00 25,0,75 to 0,25,75 to 0,75,25 to 25,75,0;text dark 12 70,18 pyroclastic breccia;text dark 12 70,21.5 agglomerate;line dark 69,19 to 87.5,6.25,6.25;text dark 13 42,28,28 tuff breccia;text dark 13 12,44,44 lapilli tuff;text dark 12 2,70 lapillistone;text dark 12 85,70 tuff/ash tuff;line dark 6.25,87.5,6.25 to 9,71;line dark 6.25,6.25,87.5 to 92,71;'>Classification of polymodal pyroclastic rocks (after Fisher, 1966)

Sub-divisions of Pyroclastic-rockHide

Synonyms of Pyroclastic-rockHide

References for Pyroclastic-rockHide

Reference List:
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FISHER, R V. 1961. Proposed classification of volcaniclastic sediments and rocks. Geological Society of America Bulletin, Vol. 72, 1409–1414.
FISHER, R V, AND SCHMINKE, H U. 1984. Pyroclastic rocks. (Berlin: Springer-Verlag.)
FISHER, R V, AND SMITH, G A . 1991. Volcanism, tectonics and sedimentation, 1–5 in Sedimentation in volcanic settings. SEPM (Society for Sedimentary Geology) Special Publication, No. 45.

Internet Links for Pyroclastic-rockHide

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