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Geol 1330 Weathering

by: Alexa Cortez

Geol 1330 Weathering GEOL 1330

Marketplace > University of Houston > GEOL 1330 > Geol 1330 Weathering
Alexa Cortez
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On exam 2
Physical Geology
Michael Murphy
Class Notes




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This 7 page Class Notes was uploaded by Alexa Cortez on Tuesday October 11, 2016. The Class Notes belongs to GEOL 1330 at University of Houston taught by Michael Murphy in Fall 2016. Since its upload, it has received 4 views.

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Date Created: 10/11/16
Physical Geology 1330   Dr. Mike Murphy Weathering and Erosion Lecture Summary  Major Factors Controlling Rates of Weathering  Chemical Weathering and the Products  Physical Weathering and the Products Weathering – the set of processes by which rocks are broken down at the Earth’s surface. Erosion – the set of processes that loosen and move soils and rock downhill or     downwind. / The physical removal of material by mobile agents such as water,  wind, or ice. Mass Wasting – Transfer of rock and soil downslope under the influence of  gravity. Major Factors Controlling Rates of Weathering         Weathering Rate                                                             Slow                                                                     Fast Properties of parent rocks Mineral Solubility – Low(Quartz), Intermidiate (Iron and magnesseme),Moderate(pyroterate),  high(Calcite) Rock Structure – Massives (has some fractures or not fractured at all),Some zones of weakness  (iron and magnesium), Very fractured or thinly bedded Climate Rainfall­  Low, Moderate,  Heavy  Tempeture­ Cold, Temperate, Hot Presence or Absence of Soil and Vegetation Thickness of soil layer­ None­ bare rock,Thin to moderate, Thick Organic activity­ Sparse, moderate,Abundant Length of Exposure­ Short, Moderate, Long How do fractures assist in the weathering rate? Surface area. Chemical Weathering – the process by which the minerals in rocks are chemically  altered or dissolved./ The principle agent of the chemical weathering is water. Chemical weathering of silicates Quartz:very stable Feldspars: Form clay minerals  Mafic minerals: decompose to oxides Chemical weathering of carbonates Easliy soluble in water(especially with some acid present) Ca and Mg taken into solution Ionic Bond The Slightly  acidic rain  dissolves  minerlas  exposed at or  near the Earths  surface.  Kaolintie AKA rust Mechanical (Physical) Weathering Unloading­removal of overlying rock (overburden) resulting in a decrease in pressure. Results in exfoliation surfaces within the rock. Thermal Expansion (Frost Wedging) — differential expansion of minerals due to  temperature changes creates stress in rocks — water expands by 9% when it freezes Organic activity  — fragmentation of rocks by organisms such as tree roots.  Mechanical abrasion  — scouring and plucking of rock due to movement of water,  glaciers, or other rocks over them. 


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