Lecture - 12 Weathering

Lecture - 12 Weathering - Weathering Exam 1 Average 70...

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Weathering
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Exam 1 Average 70
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Chemical Weathering of Granite Weathering of granite Weathering of potassium feldspar produces clay minerals, soluble salt (potassium bicarbonate), and silica in solution Quartz remains substantially unaltered Weathering of silicate minerals produces insoluble iron oxides and clay minerals
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Chemical Weathering of Granite
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Granite Weathering 2KAlSi3O8 + 2(H+ + HCO3-) + H2O Al2Si2O5(OH)4 + 2K+ + 2HCO3- + 4SiO2 K-feldspar carbonic acid clay mineral bicarbonate silica in solution
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Iron Oxides
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Spheroidal Weathering Video
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What factors control weathering rates?
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Rates of Weathering Mechanical weathering aids chemical weathering by increasing the surface area Important factors Rock characteristics Mineral composition and solubility Physical features such as joints
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Joints and Surface Area
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Rates of Weathering Important factors Climate Temperature and moisture are the most crucial factors Chemical weathering is most effective in areas of warm temperatures and abundant moisture
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Rainfall, Temperature, and Weathering
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Weathering Factors
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Rates of Weathering Differential weathering Caused by variations in composition Creates unusual and spectacular rock formations and landforms
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Arches Video
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Weathering and Ore Deposits Process called secondary enrichment Concentrates metals into economical deposits Takes place in one of two ways Removing undesired material from the decomposing rock, leaving the desired elements behind Desired elements are carried to lower zones and deposited Examples Bauxite, the principal ore of aluminum Many copper and silver deposits
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Granite Weathering 2KAlSi3O8 + 2(H+ + HCO3-) + H2O Al2Si2O5(OH)4 + 2K+ + 2HCO3- + 4SiO2 K-feldspar carbonic acid clay mineral kaolinite bicarbonate silica in solution
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Kaolinite Weathering Al2Si2O5(OH)4 + 4(H+ + HCO3-) 2AlO(OH) + 4HCO3- + 2SiO2 + 3H2O Bauxite carbonic acid Kaolinite bicarbonate silica in solution
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This note was uploaded on 01/26/2012 for the course EAS 2600 taught by Professor Ingalls during the Fall '08 term at Georgia Tech.

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Lecture - 12 Weathering - Weathering Exam 1 Average 70...

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