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volcanic breccia

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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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With a zone occurrence about three kilometres long and a kilometre wide; the rocks being targeted are considered to be a very rare find of xenolith-bearing lamprophyre occurring in a volcanic breccia.
Outcroppings of hydrothermally altered volcanic breccia exhibit strong silicification and hypogene clay alteration with abundant limonite.
8 metres in Hole MCC 16 occurs in a silicified volcanic breccia with cross-cutting quartz veinlets and fine grained, wispy pyrite.
 
 
 
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