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10-Oct-2018 02:51

However, over geological timescales things like major eruptions and human industry are mere punctuation marks in a long sentence.

Rocks that contain carbonates - limestone and dolomite being common examples - react rather more quickly too because the minerals they are largely made from, such as calcite (calcium carbonate) are more reactive than silicates.

It involves the chemical reactions between chemical compounds in the atmosphere and chemical compounds on the planet's surface.

When your car's exhaust pipe falls apart noisily, it is because the steel from which it was constructed has, over several years, reacted with oxygen and rainwater to form rust. But that's a relatively fast example involving a relatively unstable compound.

Carbonate dissolution leads to the formation of karstic landscapes complete with cave-systems lined with deposits of reprecipitated calcium carbonate forming stalactites and other features.

The dissolution reaction goes as follows: carbonic acid calcium carbonate = calcium bicarbonate (in solution) Silicate minerals occur widely in nature.

The common primary ore, chalcopyrite, is a sulphide of copper and iron that reacts readily with air and moisture at the surface.

limestones), huge quantities of atmospheric carbon dioxide end up locked away for a very, very long time.

The process begins when CO (or carbonic acid - the old name for carbon dioxide was carbonic acid gas) Rainwater containing carbonic acid is able to react with most minerals at varying rates according to their chemical stability.

All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. This post delves into the long-term carbon cycle that involves the interactions of the atmosphere with rocks and oceans over many millions of years.

Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. Because of its length, I've broken it up into bookmarked sections for easy reference: to come back here click on 'back to contents' in each instance. Carbon dioxide and rock weathering: the chemistry Limitations to the precipitation of calcium carbonate: the Carbonate Compensation Depth The significance of weathering as a carbon-sink Deep weathering of rocks: an illustrated example from Mid-Wales, UK How breaking up minerals affects their weathering-rate: mountain-building as an accelerant Picking up signals of major weathering episodes in the geological record Weathering is a familiar process to us all.Now, some naturally-occurring minerals are extremely stable.



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