volcanic breccia


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Related to volcanic breccia: brecciation

volcanic breccia

[väl′kan·ik ′brech·ə]
(petrology)
A pyroclastic rock that is composed of angular volcanic fragments having a diameter larger than 2 millimeters and that may or may not have a matrix.
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For the first type, the breccia fragments are composed of poorly sorted angular clasts of altered andesite, volcanic breccia and tectonic breccia, which were cemented by quartz-sulfide veins and the breccia partly contains chlorite and illite alteration minerals and pyrite (Fig.
The geothermal reservoir is a fracture zone with the lithology of volcanic breccia, sand, and gravel and volcanic breccia and marble, respectively.
Cabo's discovery (a volcanic breccia) is something ordinarily that would've been walked over until recently."
The prospect is flat lying within a lateritised volcanic breccia and covers approximately 6 square km around a diatreme style of volcanic vent.
6), the area of its westernmost outcrops, the San Hipolito includes serpentinites (Rangin, 1982), basaltic pillow lavas with interbedded limestones and volcanic breccias, a bed of pink dolomite, silicified vitreous tuff, green, brown, red, and whitish calcareous tuff, sandstone, and calcareous siliceous shale (Davila and Pessagno, 1986).
At the Cedar Hill iron deposit north of Pilot Knob, MO, hematite ores are contained within rhyolitic volcanic breccias of the Proterozoic St.