1. Calcium carbonate sediments: These sediments are composed primarily of calcium carbonate (CaCO3) and are formed from the accumulation of the skeletons and shells of marine organisms such as corals, mollusks, and foraminifera. Examples include limestone and chalk.
2. Siliceous sediments: These sediments are composed primarily of silica (SiO2) and are formed from the accumulation of the skeletons and tests of microscopic organisms such as diatoms and radiolarians. Examples include diatomaceous earth and chert.
3. Phosphatic sediments: These sediments are composed primarily of calcium phosphate (Ca3(PO4)2) and are formed from the accumulation of the bones, teeth, and excretions of marine vertebrates. Examples include phosphorite and bone beds.
4. Organic-rich sediments: These sediments are composed of a high proportion of organic matter, such as plant debris, animal remains, and microbial biomass. Examples include peat, sapropel, and oil shale.
The term "biogenous sediment" refers specifically to sediments that are formed from the accumulation of organic remains. These sediments are important components of the Earth's sedimentary record and can provide valuable information about past environments and climates.
Which is not a biogenous sediment?
Laterite soil is not a biogenous sediment. Laterite soil is a type of soil that is formed through the process of laterization, which is the intense chemical weathering of rocks in warm, humid climates. Laterite soils are typically rich in iron and aluminum oxides and are often used in the construction industry.
