Chemical Weathering Definition: transformation/decomposition of one mineral into another Mineral breakdown carbonate dissolves primary minerals --> secondary.

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Presentation transcript:

Chemical Weathering Definition: transformation/decomposition of one mineral into another Mineral breakdown carbonate dissolves primary minerals --> secondary minerals (mostly clays) Net loss of elements retained in the soil.

Water is the main operator: – Dissolution Many ionic and organic compounds dissolve in water – Silica, K, Na, Mg, Ca, Cl, CO 3, SO 4 – Acid Reactions Water + carbon dioxide carbonic acid Water + sulfur sulfuric acid H + effective at breaking down minerals Chemical Weathering

Dissolution H 2 O + CO 2 + CaCO 3 --> Ca HCO 3 - water + carbon dioxide + calcite dissolve into calcium ion and bicarbonate ion Biological activity in soils generates substantial CO 2 Bicarbonate is the dominant ion in surface runoff.

Oxidation – Oxygen dissolved in water promotes oxidation of sulfides, ferrous oxides, native metals Organic Activity – Plant material makes H + ions available Chemical Weathering

Hydration: attachment of water molecules to crystalline structure of a rock, causing expansion and weakness (physical and chemical weathering) Hydrolysis: combination of hydrogen and oxygen in water with rock to form new substances Chemical Weathering

Solution: process by which rock is dissolved in water Strongly influenced by pH and temperature When water becomes saturated, chemicals may precipitate out forming evaporite deposits. Calcium carbonate (calcite, limestone), sodium chloride (salt), and calcium sulfate (gypsum) are particularly vulnerable to solution weathering. Chemical Weathering

Bowen’s Reaction Series Goldrich Stability Series First to Crystallize Last to Crystallize Slow Weathering Fast Weathering Resistance to Weathering

Olivine/pyroxene to clay + H 2 CO 3 (acid)

Feldspars to clay + H 2 CO 3 (acid)

Quartz to quartz (!) + anything

This photo of Lime Sink was taken on 20 July 1932, over a week after the drawdown, which occurred over the night of 9-10 July. ‘Karst’ landforms develop in areas underlain with limestone

Biological Weathering Can be both chemical and mechanical in nature. roots split rocks apart roots produce acids that dissolve rocks. burrowing animals

Rates of weathering Climate – Temperature and moisture characteristics – Chemical weathering Most effective in areas of warm, moist climates – decaying vegetation creates acids that enhance weathering Least effective in polar regions (water is locked up as ice) and arid regions (little water) – Mechanical weathering Enhanced where there are frequent freeze-thaw cycles What affects Weathering?

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