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- The difference between chemical and biochemical sedimentary rocks is that in biochemical sedimentary rocks, organisms play a role in turning the ions into sediment. This means the presence and nature of biochemical sedimentary rocks are linked to the life requirements of the organisms that comprise them.
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What is a Biochemical sedimentary rock?
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It is possible for one type of sedimentary rock to form from both chemical (inorganic) and biochemical (organically mediated) processes. Chemical and biochemical sedimentary rocks are classified based on the minerals they contain, and are frequently dominated by a single mineral.
- Karla Panchuk
- 2019
The difference between chemical and biochemical sedimentary rocks is that in biochemical sedimentary rocks, organisms play a role in turning the ions into sediment. This means the presence and nature of biochemical sedimentary rocks are linked to the life requirements of the organisms involved.
Apr 11, 2024 · Biochemical sedimentary rocks are commonly composed of calcite, from a wide variety of sea life, or silica, largely from the single-celled microorganisms called radiolarian. Organic sedimentary rock contains the remains of organic material that has undergone the lithification process.
This chapter focuses on sedimentary rocks other than clastics and carbonates (evaporites, siliceous, and organic-rich rocks). Most of them form either from direct precipitation from fluids or because of the activities of living organisms.
Biochemical sedimentary rocks are formed from shells and bodies of underwater organisms. The living organisms extract chemical components from the water and use them to build shells and other body parts.
A biochemical sedimentary rock. Coquina is a biochemical variety of limestone that is composed of shells, fossils, and sand that have been poorly cemented together. Coquina is often tan in color with shells that are easily visible to the naked eye.
Chemical sedimentary rocks form when dissolved materials preciptate from solution. Examples include: chert, some dolomites, flint, iron ore, limestones, and rock salt. Organic sedimentary rocks form from the accumulation of plant or animal debris.
