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8. Influence of Uplift, Weathering, and Base Cation Supply on Past and Future CO Levels Jacob R. Waldbauer and C. Page Chamberlain 8.1 Tectonics, Rock Weathering, and CO Drawdown The weathering of silicate minerals has long been recognized as one of the dominant controls on atmospheric CO . A pair of well-known reactions (Urey 1952) summarizes a series of biogeochemical processes that begin with the weathering of calcium and magnesium silicates and end with the burial of Ca- Mg carbonates in marine sediments: CO CaSiO ↔ CaCO SiO 23 3 2 CO MgSiO ↔ MgCO SiO 23 3 2 The net result is that, for each mole of calcium or magnesium silicate weath- ered on the continents, one mole of carbon dioxide is sequestered in marine carbonate. Thermal decomposition of these carbonates releases the CO back into the atmosphere. Along with fixation of CO by plants and its release during oxidative weathering of organic matter, silicate weathering is the major process controlling atmospheric CO levels on the multimillion-year timescale (Berner and Kothavala 2001). In addition to causing this direct effect on atmospheric CO , rock weathering can influence carbon dioxide levels indirectly. In many ecosystems,
Published: Jan 1, 2005
Keywords: Base Cation; 86Sr Ratio; Tectonic Uplift; Chemical Weathering; Planetary Science Letter
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