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In geology, an igneous intrusion (or intrusive body or simply intrusion ) is a body of intrusive igneous rock that forms by crystallization of magma slowly cooling below the surface of the Earth. Intrusions have a wide variety of forms and compositions, illustrated by examples like the Palisades Sill of New York and … See more
Intrusions are broadly divided into discordant intrusions, which cut across the existing structure of the country rock, and concordant intrusions … See more
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The ultimate source of magma is partial melting of rock in the upper mantle and lower crust. This produces magma that is less dense than its … See moreWikipedia text under CC-BY-SA license WEBExamples of intrusive igneous rocks are: diabase, diorite, gabbro, granite, pegmatite, and peridotite. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so …
WEBIgneous rock - Intrusive, Magma, Plutonic: Erosion of volcanoes will immediately expose shallow intrusive bodies such as volcanic necks and diatremes (see Figure 6). A volcanic neck is the “throat” of a volcano …
WEBIgneous intrusions form when magma cools and solidifies before it reaches the surface. Three common types of intrusion are sills, dykes, and batholiths (see image below).
4.4 Intrusive Igneous Rocks – Principles of Earth Science
WEB4.4 Intrusive Igneous Rocks – Principles of Earth Science. In most cases, a body of hot magma is less dense than the rock surrounding it, so it has a tendency to creep upward toward the surface. It does so in a few …
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The impact of igneous intrusions on sedimentary host rocks: …
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