Abstract
The rocks treated in this chapter represent those products of rock weathering which are carried away in aqueous solution, and deposited directly by physico-chemical processes such as evaporation and precipitation. As precipitation from solution generally produces a finely divided crystalline or amorphous powder, the grain-size of the rocks formed by this process is usually small. On the other hand, the evaporation of solutions may, under favourable circumstances, promote the growth of large crystals, as in many salt and gypsum deposits. The re-crystallisation of fine-grained chemical deposits favours the same development, and oolitic and pisolitic structures also produce an effect of coarse grain. Grabau has proposed the terms spheryte, granulyte, and pulveryte for chemical (and organic) rocks, the grain of which corresponds with that of rudaceous, arenaceous, and argillaceous rocks respectively.1
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References
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© 1978 Chapman & Hall Ltd
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Tyrrell, G.W. (1978). Deposits of Chemical Origin. In: The Principles of PETROLOGY. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-6026-1_13
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DOI: https://doi.org/10.1007/978-94-011-6026-1_13
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