Ignimbrite

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.

Ignimbrite

(or welded tuff), fragmental volcanic rocks with a tuff body consisting of lava and ash, with comparatively large inclusions of dark glass embedded in the body. In the marginal zones the glass and tuff usually merge so that the rocks appear to be welded. Against the gray background of the rock the glass inclusions appear either as irregular flakes and sparks or as lenses arranged in a subparallel manner which by their shape resemble tongues of flame. For this reason they are frequently called fiamme from the Italian word for flame. The formation of ignim-brite is explained by deposition from glowing ash clouds that occur during Katmai-type eruptions. Ignimbrite is most often found among persilicic volcanic rocks (rhyolites, trachytes, da-cites, and more rarely andesites) and occurs in the form of horizontal beds in volcanogenic masses. Ignimbrites are characteristic for many of the world’s volcanic regions.

单词	ignimbrite
释义	ignimbrite ig·nim·brite I0026550 (ĭg′nĭm-brīt′)n. A volcanic rock formed by the deposition and consolidation of ash flows and nuées ardentes. [Latin ignis, fire + imber, imbr-, rain + -ite.] ignimbrite (ˈɪɡnɪmˌbraɪt) n (Geological Science) a rock formed by the deposition at high temperature and the consolidation of a nuée ardente or other type of ash flow, being a complicated mixture of volcanic materials welded together by heat, hot gases, and pressure. Also called: welded tuft See tuft[C20: from Latin ign(is) fire + imbr(is), imber shower of rain + -ite¹] Ignimbrite 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. Ignimbrite (or welded tuff), fragmental volcanic rocks with a tuff body consisting of lava and ash, with comparatively large inclusions of dark glass embedded in the body. In the marginal zones the glass and tuff usually merge so that the rocks appear to be welded. Against the gray background of the rock the glass inclusions appear either as irregular flakes and sparks or as lenses arranged in a subparallel manner which by their shape resemble tongues of flame. For this reason they are frequently called fiamme from the Italian word for flame. The formation of ignim-brite is explained by deposition from glowing ash clouds that occur during Katmai-type eruptions. Ignimbrite is most often found among persilicic volcanic rocks (rhyolites, trachytes, da-cites, and more rarely andesites) and occurs in the form of horizontal beds in volcanogenic masses. Ignimbrites are characteristic for many of the world’s volcanic regions.
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ignimbrite

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ignimbrite

Ignimbrite

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Ignimbrite