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pyroclastic rock |
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pyroclastic rock [¦pī·rə¦klas·tik ′räk] (petrology) A rock that is composed of fragmented volcanic products ejected from volcanoes in explosive events. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Each deposition mechanism may occur in a subaerial or submarine setting, although in the latter it is likely that pyroclasts are reworked to some degree and thus are classified as volcaniclastic deposits. Gold mineralization occurs in at least nineteen mineralized veins and zones of hydrothermal breccia hosted by gently northeast dipping volcaniclastic rocks (ranging from 50 meters to 200 meters in length, 0. The beryl occurs as small opaque crystals having numerous fractures in narrow quartz-calcite-pyrite veins cutting volcaniclastic rocks adjacent to a quartz-monzonite intrusion. |
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