Lecture+9+Weathering

Lecture+9+Weathering - Lecture 9 Weathering Test Thursday...

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Unformatted text preview: Lecture 9 Weathering Test Thursday September 18 Chapters 7, 8, 9, 10, 2, 3 and relevant parts of Chapter 1 on earth structure Bring your ID Old Test on T-square New Test - Will have some written questions Metamorphic rocks Metamorphic textures • Foliated texture • Minerals are in a parallel alignment • Minerals are perpendicular to the compressional force • Nonfoliated texture • Contain equidimensional crystals • Resembles a coarse-grained igneous rock Development of foliation due to directed pressure Metamorphic rocks Common metamorphic rocks • Foliated rocks • Slate • Fine-grained • Splits easily • Schist • Strongly foliated • "Platy" • Types based on composition (e.g., mica schist) Classification of metamorphic rocks Metamorphic rocks Common metamorphic rocks • Foliated rocks • Gneiss • Strong segregation of silicate minerals • "Banded" texture • Nonfoliated rocks • Marble • Parent rock is limestone • Large, interlocking calcite crystals Gneiss typically displays a banded appearance Metamorphic rocks Common metamorphic rocks • Nonfoliated rocks • Marble • Used as a building stone • Variety of colors • Quartzite • Parent rock – quartz sandstone • Quartz grains are fused Marble – a nonfoliated metamorphic rock Resources from rocks and minerals Metallic mineral resources • Gold, silver, copper, mercury, lead, etc. • Concentrations of desirable materials are produced by • Igneous processes • Metamorphic processes Resources from rocks and minerals Metallic mineral resources • Most important ore deposits are generated from hydrothermal (hot-water) solutions • Hot • Contain metal-rich fluids • Associated with cooling magma bodies • Types of deposits include • Vein deposits in fractures or bedding planes, and • Disseminated deposits which are distributed throughout the rock Resources from rocks and minerals Nonmetallic mineral resources • Make use of the material’s • Nonmetallic elements • Physical or chemical properties • Two broad groups • Building materials (e.g., limestone, gypsum) • Industrial minerals (e.g., fluorite, corundum, sylvite) Earth's external processes Weathering – the disintegration and decomposition of material at or near the surface Mass wasting – the transfer of rock material downslope under the influence of gravity...
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This note was uploaded on 10/22/2008 for the course EAS 2600 taught by Professor Ingalls during the Fall '08 term at Georgia Tech.

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Lecture+9+Weathering - Lecture 9 Weathering Test Thursday...

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