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tuff
(redirected from Welded tuff)

    Also found in: Wikipedia 0.10 sec.

tuff

Relatively soft, porous rock that is usually formed by the compaction and cementation of volcanic ash or dust. Tuff may vary greatly not only in texture but also in chemical and mineralogical composition. In some eruptions, foaming magma wells to the surface as an emulsion of hot gases and incandescent particles; the shredded pumice-like material spreads swiftly, even over gentle slopes, as a glowing avalanche (nuée ardente) that may move many miles at speeds of 100 mph (160 kph).
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Extensive surface sampling, outlined three large areas of consistent gold/silver mineralization leaking through an unmineralized welded tuff.
Drill Program (20,000 ft.) to Begin in January on Southwestern Nevada ... by Business Wire
Extensive surface sampling, recently outlined three large areas of consistent gold/silver mineralization leaking through an unmineralized welded tuff cover.
Golconda Resources Ltd. - Corporate Update; DRILLING STARTED ON ... by Business Wire
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