Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian

Oolitic Limestone

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_1779

Oolitic limestone is also called oolite, and it is a limestone primarily composed of ooids. Based on the characteristics of the internal ooid structure, oolitic limestones can be divided into normal oolitic limestone, thin crust oolitic limestone, pseudo-oolitic limestone, allochemical oolitic limestone and negative oolitic limestone. According to the composition of the filling between the oolitic grains, oolitic limestones can be categorized as oosparite and oomicrite. Oolitic limestone forms in regions of over-saturated water, such as marine or lake wave zones or tidal channels. It is formed by both mechanical and chemical processes. Wave and tidal action agitate the water, which in turn causes biological debris, pellets, clastic and terrestrial debris to be suspended and simultaneously causes the carbon dioxide in the water to escape. Under such circumstances, the supersaturated calcium carbonate will precipitate around the grains to form a coating. This process repeats and...

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