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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 that intrude parallel to existing See more
The room problem
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 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 and …
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 …
WebTypes of Plutons. Stocks and Batholiths. Large irregular-shaped plutons are called either stocks or batholiths, depending on their area. If an irregularly shaped body has an area greater than 100 km 2, then it’s a batholith, …
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The impact of igneous intrusions on sedimentary host rocks: …