sedimentary rocks overview

Aug 14th, 2016
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Overview of Sedimentary RocksI.Basic DefinitionsA.Denudation of the Earth's surface1.II.Dynamic interaction between uplift of Earth's crust and erosion of materialsB.Weathering - disintegration and decomposition of rock at or near the surface of the earth,fragmenting rock into particles1.Physical Weathering - physical breakdown2.Chemical Weathering - chemical weathering and dissolutionC.Sediment - fragments of rocks and/or minerals that are produced from the weathering ofpre-existing rock1.Examples: clay, silt, sand, gravel, bouldersD.Erosion - incorporation and transportation of sediment by a mobile agent1.Agents of Transportationa.wind (e.g. sand dunes, atmosperic dust)b.water (rivers, coastal areas)c.ice (glaciers)d.gravityE.Mass wasting - transfer of rock material downslope under the influence of gravityWeathering - surface processes operating on rock from the earth's crustA.Driving mechanism of rock weathering1.Igneous and metamorphic rocksa.Form at High temperature, High pressure2.Rock exposure at Earth's surfacea.uplift and denudation3.Surface: low temperature / low pressure environmenta.Water-rich environment4.High temp / high pressure rocks are unstable in water-rich, low temp/low press.environment of Earth's surfacea.Weathering drives system to new equilibrium stateB.Physical or Mechanical Weathering1.defined: physical diminution or fragmentation of the rocka.sediment = fragmented rock parti

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