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What are biochemical sedimentary rocks?

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On land, plants that die in a swampy environment may become deeply buried beneath other plants and detrital sediment. Such plant matter, also biochemical sediment, undergoes chemical reactions as it alters into the rock called coal. Below are some of the many types of biochemical sedimentary rocks found on Earth. read more

Biochemical sedimentary rocks form from sediment derived by biological processes. This typically occurs in the ocean where a variety of atoms float among the water molecules. Ions, such as calcium, magnesium, and potassium, along with trace elements like silicon, fluorine, iron and phosphorous, are used by marine organisms to form their hard and soft tissues. read more

In contrast, chemical and biochemical sedimentary rocks are dominated by components that have been transported as ions in solution (e.g., Na +, Ca 2+, HCO 3 –, etc.). There is some overlap between the two because almost all clastic sedimentary rocks contain cement formed from dissolved ions, and many chemical sedimentary rocks include some clasts. read more

Chemical and Biochemical Sedimentary Rocks Oolitic Limestone typically forms in tidal regions where particles are in constant motion Chemical sedimentary rock is formed when minerals, dissolved in water, begin to precipitate out of solution and deposit at the base of the water body. read more

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biochemical sedimentary rocks
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