tuff

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Related to tuffaceous: Volcanic Tuff

tuff

(tŭf)

A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.

[French tuf, from Old French, from Old Italian tufo, tufa; see tufa.]

tuff·a′ceous (tŭ-fā′shəs) adj.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

tuff

(tʌf)

(Geological Science) a rock formed by the fusing together on the ground of small rock fragments (less than 2 mm across) ejected from a volcano

[C16: from Old French tuf, from Italian tufo; see tufa]

tuffaceous adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

tuff

(tʌf)

n.

a fragmental rock consisting of the smaller kinds of volcanic detritus, as ash or cinder, usu. more or less stratified.

[1560–70; < Middle French tuf(e) < Italian tufo. See tufa]

tuff•a′ceous, adj.

tuff

(tŭf)

A rock made up of particles of volcanic ash, varying in size from fine sand to coarse gravel.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

tuff

A rock made up of compacted volcanic ash; also known as tufa.

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Noun

tuff - hard volcanic rock composed of compacted volcanic ash

tufa

volcanic rock - extrusive igneous rock solidified near or on the surface of the Earth

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References in periodicals archive ?

The Licence contains two northeast trending ophiolite belts and an overlaying tuffaceous volcano-sedimentary sequence, in addition to two syn-tectonic granitoid intrusions.

Altus Strategies Plc - Gold Discoveries on Zager VMS Licence in Northern Ethiopia

But our efforts were fruitless, mainly because the mountainous terrain and tuffaceous subsurface do not preserve ground rupture well, especially with a relatively weak magnitude.

An unknown fault strikes Luzon

At the Point gold prospect, MAS Gold intends to twin historic hole RM86-21, drilled by Saskatchewan Mining and Development Corporation ("SMDC") in 1986 at azimuth 087o and dip -45o, that intercepted multiple zones of gold-mineralized sheared quartz veins within a carbonate-altered, tuffaceous volcanic host rock.

MAS Gold Corp. Begins Drilling at Point Prospect in Saskatchewan, Canada

Tuffaceous debris and tuffite are widely distributed in sandstone, mudstone and carbonatite lithologies.

ORGANIC GEOCHEMISTRY AND DEPOSITIONAL ARCHITECTURE OF JIMUSAER OIL SHALE, JUNGGAR BASIN, NW CHINA

The lithology of the Laoling formation ([Pt.sub.1]z) is dolomitic marble, with an average thickness of 467 m, the lithology of the Changbai formation ([T.sub.3]c) is rhyolite and rhyolitic pyroclastic rocks and the average thickness is 1300 m, the lithology of the Junjianshan formation ([Q.sub.1]pj) is basalt and olivine basalt and the average thickness is 189 m, the lithology of the Baitoushan formation ([Q.sub.2]b) is trachyte and tuffaceous trachyte and the average thickness is about 130 m, and the lithology of the Bingchang formation ([Q.sub.4]bc) is alkaline pumice and the average thickness is about 51.5 m (Figure 1).

Hydrogeochemical Characteristics and Genesis Model of Jinjiang and Julong Hot Springs in Changbai Mountain, Northeast China

West of Whangaroa Harbour, for example, is an area consisting of "Trachytic breccia and basaltic conglomerates overlying tuffaceous sandstone with fossil plants which rest uncomfortably on green sandstones containing coal seams and Upper Secondary fossils".

MAPPING THE GEOLOGY OF NORTHLAND, NEW ZEALAND: N.Z. GEOLOGICAL SURVEY BULLETIN NO. 8 (WHANGAROA SUBDIVISION)

From the geological point of view it occupies rocks from the Cobre Group, tuffs, tuffaceous sandstones, etc.

Forest typology of broadleaf forests from Sierra Maestra, Eastern Cuba/Tipologia forestal de los bosques latifolios de la Sierra Maestra, Cuba Oriental

Tiller, Kinetic Model of Zeolite Paragenesis in Tuffaceous Sediments, Clay.

Thermodynamic Parameters Evaluation of - and -cages in Na+, Ba2+, Fe3+, Co2+, Ni2+ and Cu2+ Exchanged Zeolite a Using Quantum Mechanical Theory and Fermi Dirac Statistics

The hyalite-bearing layer is composed of 3-50 mm rhyolite rock fragments mixed with 1-4 mm dipyramidal fe-quartz and limpid sanidine phenocrysts in a weakly welded, porous, siliceous, tuffaceous matrix.