: Paleoclimatology: chemical rock

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chemical rock

A chemical rock is a sedimentary rock produced by the precipitation of chemical compounds in aqueous solution. Chemical rocks are formed by the precipitation of minerals from dissolved elements washed into lakes or seas. Dissolved elements come from the weathering of minerals in the crust by rain, and are transported in ionic form by run-off to low-lying areas; due to solar radiation, water evaporates and concentrates into ions, and salts precipitate when their solubility product is exceeded, forming new minerals such as halite or sylvine. Similarly, stalactites and stalagmites are formed by the precipitation of calcium carbonate dissolved in the water that seeps into caves. When minerals are precipitated by the metabolism of living organisms, the rocks they form are called biochemical rocks. This is the case for radiolarites (formed from the siliceous skeleton of radiolarians) and coral reefs (formed from the calcareous skeleton of corals). (Adapted and translated from: https://fr.wikipedia.org/wiki/Roche_chimique)

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