Intrusive Igneous

Intrusive Igneous - Igneous Rocks and Intrusive Igneous...

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Igneous Rocks and Intrusive Igneous Activity What are igneous rocks? They are rocks formed of: 1. Material from volcanoes, lava flows and ejecta such as ash. 2. Rocks formed by cooling and crystallization of molten rock material known as magma . Most magma cools below the earth’s surface forming large bodies of rock known as plutons . We will study: 1. The origin, composition, textures, and classification of igneous rocks resulting from either volcanic activity or the formation of plutons. 2. The origin, significance, and types of plutons. Plutons and volcanoes are related. Today, they typically occur at or near plate boundaries indicating that they share a common origin. The present relates to the past, so finding ancient plutons or rocks resulting from volcanic activity is a criterion for identifying ancient plate boundaries. Why are igneous rocks important? 1. They are one of the three rock families. 2. They are common, making up a large part of the continental crust and nearly all of the oceanic crust. 3. Studying the physical and chemical properties of igneous rocks allows inferences about the processes responsible for their origin, including the plate tectonic setting of their formation. 4.
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This note was uploaded on 04/16/2008 for the course GEOL 1403 taught by Professor Teague during the Spring '08 term at Tarrant County.

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Intrusive Igneous - Igneous Rocks and Intrusive Igneous...

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