Lecture5 - Sedimentary rocks Weathering is the breaking...

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Sedimentary rocks
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Weathering is the breaking down of Earth's rocks, soils and minerals through direct contact with the planet's atmosphere. Weathering occurs "with no movement". Fig. 7.1
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Mechanical weathering- physical breakdown of rocks
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Mechanical weathering- physical breakdown of rocks joints
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exfoliation
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FIG. 6.3 CHEMICAL WEATHERING Fig. 6.4
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Chemical weathering- breakdown of rocks due to interactions with chemical agents
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Chemical weathering-Acid rain can dissolve rocks
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Chemical weathering-Rusting rocks
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H 2 O + CO 2 H + + HCO 3 - Water + carbon dioxide hydrogen ion + bicarbonate ion 2KAlSi 3 O 8 + 2H + + 9H 2 O Al 2 Si 2 O 5 (OH) 4 + 4H 4 SiO 4 + 2K + feldspar clay mineral acid Page 126
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Table 7.1 Weathering of Silicate Minerals Most stable at olivine Magmatic T pyroxene hornblende biotite mica Most stable potassium feldspar during muscovite mica weathering quartz
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O-horizon organic material A-horizon leached material B-horizon iron deposition
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mineral matter organic matter
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Lecture5 - Sedimentary rocks Weathering is the breaking...

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