5 Questions
What are ooids?
Spherical or sub-spherical grains with concentric lamellae around a nucleus
What do peloids consist of?
Microcrystalline carbonate and do not have internal structure
What are aggregates in limestone composed of?
Carbonate particles cemented together by microcrystalline cement or by organic matter
What is the defining characteristic of intraclasts?
Fragmentations of weakly consolidated carbonate sediments from adjoining parts of the basin
Where are ooids usually found?
< 5m depth
Study Notes
Ooids and Peloids
- Ooids are small, spherical grains of sediment that form in shallow, warm marine waters, typically in tropical or subtropical regions.
- Peloids consist of fragments of pre-existing rocks or minerals that have been broken down and re-cemented together.
Aggregates in Limestone
- Aggregates in limestone are composed of ooids, peloids, and intraclasts, which are bound together by a natural cement.
Intraclasts
- Intraclasts are fragments of pre-existing limestone that have been eroded from nearby rocks and redeposited into a new sedimentary deposit.
- The defining characteristic of intraclasts is that they are composed of limestone that has been formed earlier in the depositional history.
Ooid Distribution
- Ooids are usually found in shallow, warm marine waters, such as in tropical or subtropical regions, often in carbonate-rich environments like coral reefs or shallow marine platforms.
Test your knowledge of limestone components with this quiz covering non-skeletal grains, skeletal components, micrite, and cement arranged in stratified form as sediments. Explore the types of non-skeletal grains such as ooids, peloids, aggregates, and intraclasts, and their defining characteristics.
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