Lecture 15 Feb 25 2008 The rock cycle revisited

Lecture 15 Feb 25 2008 The rock cycle revisited - Igneous...

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This porphyritic granite has phenocrysts of feldspar in a fine-grained groundmass. Igneous Rock
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Sedimentary Rock This conglomerate has large, rounded, gravel-sized clasts of rock cemented by microcrystalline silica.
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Metamorphic Rock Garnet porphyroblasts in a mica schist.
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classes
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The rock cycle was proposed by Hutton more than 200 years ago. The rock cycle is a set of geologic processes relating the formation of the three rock types.
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James Hutton, Scotland, 1726-1797 Hutton apprenticed to a lawyer and then studied medicine, but he never practiced either. Rather, he farmed a small inherited property. Hutton proposed the Plutonian theory of Earth, arguing for subterranean fire and heat. Hutton argued for vast expanses of time in Earth’s history, with very little empirical evidence to support his ideas.
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What had happened by Hutton’s era? •The microscope had been invented About 30 chemical elements were known Crystals had been studied Mineralogy was being taught at mining schools
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This note was uploaded on 04/11/2008 for the course EVSC 280 taught by Professor Herman during the Spring '08 term at UVA.

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Lecture 15 Feb 25 2008 The rock cycle revisited - Igneous...

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