Questions and Answers
What is the definition of 'Micrite matrix, 0-1 % allochems'?
What does 'Micrite matrix, 1-10 % allochems' refer to?
What is the definition of 'Micrite matrix, 10-50% allochems'?
What is defined as 'Micrite matrix, over 50% allochems'?
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What is the definition of 'Subequal Spar and Micrite'?
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What does 'Spar Cement, sorting poor' refer to?
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What is the definition of 'Spar Cement, sorting good'?
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What does 'Spar Cement, rounded and abraded' refer to?
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What is the definition of 'Quiet water deposition'?
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What does 'High Wave current activity' refer to?
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What does the prefix 'bio' refer to?
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What does the prefix 'oo' refer to?
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What does the prefix 'pel' refer to?
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What does the prefix 'intra' refer to?
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Study Notes
Micrite Classification
- Micrite matrix containing 0-1% allochems is classified as Micrite.
- Micrite matrix with 1-10% allochems is termed Fossil-iferous Biomicrite, indicating the presence of fossils.
- For micrite matrix consisting of 10-50% allochems, the classification is Sparse Biomicrite, showing a moderate abundance of allochems.
- When the micrite matrix contains over 50% allochems, it is known as Packed Biomicrite, indicating a dense concentration of allochems.
Spar Cement Classification
- Subequal Spar and Micrite refers to a type of biosparite that is poorly washed, revealing a mix of spar and micrite.
- Spar Cement with poor sorting results in Unsorted Biosparite, where grains lack uniformity in size and distribution.
- Spar Cement with good sorting is categorized as Sorted Biosparite, indicating a homogenous grain size and better arrangement.
- Rounded and abraded Spar Cement signifies Rounded Biosparite, suggesting that the grains have undergone significant transport and wear.
Deposition Environments
- Quiet water deposition is associated with Micrite, reflective of environments with low energy where fine particles settle slowly.
- High wave current activity leads to the formation of Rounded Biosparite, where strong currents affect grain shape and size.
Fossil and Ooid Prefixes
- The prefix bio is used for fossils, indicating biological origin.
- The prefix oo denotes ooids, which are small, minimally lithified grains often formed in marine environments.
- The prefix pel relates to peliods, small grains similar to ooids but differing in origin and formation.
- The prefix intra is used for intraclasts, which are fragments of pre-existing carbonate materials.
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Test your knowledge of micrite matrices with this quiz. Each flashcard presents a different percentage of allochemicals and their corresponding definitions. Perfect for geology students or anyone interested in sedimentary rock classification.
