Tuffite

Tuffite

 

a volcanogenic sedimentary rock consisting of volcanogenic material ejected during a volcanic eruption (for example, scoria, ash, pumice, and rock fragments) and sedimentary material mixed with the volcanogenic material. Tuffite may contain rounded fragments of intrusive rocks and also quartz, feldspar, biotite, and organic remains. The cement may be carbonate or argillaceous. Tuffite is used as a building material. (See alsoVOLCANOGENIC SEDIMENTARY ROCK.)

References in periodicals archive ?
Six widely-spaced holes have been completed to date targeting the Key Tuffite horizon.
In the upper part of the tuffite series, a 6-m-thick basalt layer was drilled.
The first holes are scheduled on the East Block where a zinc tuffite was intersected four times by diamond drilling, followed by other drilling targets on the East Block, and finally the drill will be moved to the West Block where the DeepEM "in-loop" anomaly of 600 m length revealed in 2003 was confirmed and more precisely located by an InfiniTEM survey just completed.
1993), the boundary interval is characterized by three main facies: (1) volcanoclastics and basaltic rocks with subordinate shallow-water limestones, (2) shales and cephalopod limestones and (3) mostly shale facies with tuffite layers without carbonates.
The flysch series having mixed volcanic material composed of conglomerate, green and black sandstone, shale, marl, limestone, andesite, tuff and tuffite are deposited in the Upper Cretaceous limestone.
Overburden layers reach up to 50 m in thickness; of all, 30-40 m of the profile is represented by tuff and tuffite layers usually several decimetres thick.
The first three holes are located in the eastern block of the Du Dome-Matagami Property where a zinc tuffite was intersected twice by diamond drilling in 2004; they have intersected the tuffite at two other locations.
Good continuity is interpreted between this hole and the mineralization intersected at the Key tuffite exhalite interface in hole MC-04-07.
The first three holes are all located inside the eastern block of the Du Dome-Matagami Property where a zinc tuffite was intersected twice by diamond drilling in 2004.