welded tuff


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Related to welded tuff: Volcanic Tuff, Volcanic breccia

welded tuff

[′wel·dəd ′təf]
(petrology)
A pyroclastic deposit hardened by the action of heat, pressure from overlying material, and hot gases. Also known as tuff lava.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The most densely welded tuffs are compacted into vitrophere, a crystal-rich volcanic glass containing rock fragments.