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ignimbrite |
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ignimbrite [′ig·nəm‚brīt] (petrology) A rock deposit (welded or not) resulting from one or more ground-hugging flows of hot volcanic fragments and particles commonly produced during explosive eruptions (pyroclastic flows and tephra fall). Most ignimbrites have a sheet-like shape, cover many thousands of square kilometers, and have chemical compositions that span the range commonly exhibited by igneous rocks (basaltic to rhyolitic). Also known as ash-flow tuff; pyroclastic-flow deposit; welded tuff. 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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1990, The Rosebury controversy: distinguishing prospective submarine ignimbrite-like units from true subaerial ignimbrites in the Rosebury-Hercules Zn-Cu-Pb massive sulfide district, Tasmania: Geological Society of Australia Abstracts, v. In addition there are Tertiary-aged volcanic rocks including voluminous rhyolitic ignimbrites and andesite. The mines exploited low-sulfidation epithermal quartz veins, stockworks and breccias, hosted by Tertiary rhyolite ignimbrite within the Tepic-Chapala Graben. |
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