Podcast
Questions and Answers
Which of the following is a major component of most igneous rocks, such as granites, andesites, and gabbros, as well as some schists and gneisses?
Which of the following is a major component of most igneous rocks, such as granites, andesites, and gabbros, as well as some schists and gneisses?
- Feldspar (correct)
- Muscovite
- Quartz
- Biotite
Which type of feldspar is more common in sandstones compared to plagioclase feldspar?
Which type of feldspar is more common in sandstones compared to plagioclase feldspar?
- K-feldspar (correct)
- Albite
- Na-feldspar
- Anorthite
What is the role of matrix in sandstones?
What is the role of matrix in sandstones?
- It is composed of larger grains than the framework grains
- It is the primary component of the sandstone
- It acts as a cement, binding the framework grains together (correct)
- It increases the porosity of the sandstone
What is the primary source of quartz in sandstones?
What is the primary source of quartz in sandstones?
What is the significance of the presence of glauconite in a sandstone?
What is the significance of the presence of glauconite in a sandstone?
How can the composition of sandstones be used to infer the provenance (source) of the sediments?
How can the composition of sandstones be used to infer the provenance (source) of the sediments?
Which of the following is NOT a typical characteristic of green sandstone rich in the mineral glauconite?
Which of the following is NOT a typical characteristic of green sandstone rich in the mineral glauconite?
What is the primary purpose of studying heavy minerals in sedimentary deposits?
What is the primary purpose of studying heavy minerals in sedimentary deposits?
Which of the following is the best definition of the matrix in a sandstone?
Which of the following is the best definition of the matrix in a sandstone?
According to the Pettijohn (1975) classification, which type of sandstone is characterized by a dominance of lithic fragments?
According to the Pettijohn (1975) classification, which type of sandstone is characterized by a dominance of lithic fragments?
Which of the following types of rocks is NOT typically found as a lithic fragment in a sandstone deposit?
Which of the following types of rocks is NOT typically found as a lithic fragment in a sandstone deposit?
Which type of sandstone is characterized by a significant matrix (>15% mud) and is considered a type of greywacke?
Which type of sandstone is characterized by a significant matrix (>15% mud) and is considered a type of greywacke?
What is the term used to describe a sedimentary rock composed primarily of silt-sized particles?
What is the term used to describe a sedimentary rock composed primarily of silt-sized particles?
Which of the following is a characteristic of shale?
Which of the following is a characteristic of shale?
What is the term used to describe a sandstone with less than 15% matrix material?
What is the term used to describe a sandstone with less than 15% matrix material?
What is the primary component of loess deposits?
What is the primary component of loess deposits?
Which group of clay minerals is formed in warm, humid environments where acid waters extensively leach bedrock such as granite?
Which group of clay minerals is formed in warm, humid environments where acid waters extensively leach bedrock such as granite?
What process is responsible for the clumping together of clay particles into larger particles that settle out of suspension at a faster rate?
What process is responsible for the clumping together of clay particles into larger particles that settle out of suspension at a faster rate?
