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.
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It can be grouped broadly into the following phases: 1) felsite, welded tuff, explosion breccia as extrusive phase, 2) granite/granite porphyry as intrusive phase, 3) ring dyke of quartz porphyry as dyke phase and, 4) Delhi quartzite, quartz mica schist as country rocks.