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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The diamonds occur in an olivine lamproite volcanic breccia.
This hole intersected and mineralized volcanic breccia from 325 to current depth containing pyrite 1-15% (averaging 4%).
60 metres, was characterized by altered polylithic volcanic breccia and litharenite locally hosting massive base metal clasts up to 4 centimetres in diameter containing chalcopyrite, sphalerite, and galena.
The Carmen Property encompasses a magnetic anomaly within Tertiary volcanic breccia.
each) were collected representing various rock types within the exposed volcanic breccia.
At Pacao Creek a 15m by 30m outcrop of massive silicified volcanic breccia is cut by a stockwork of sulphide stringers and veinlets.
The high-grade intercept in NV04-14 spans the contacts between sulphide-rich mudstones and underlying mineralized volcanic breccias.