What is the primary basis for distinguishing among detrital sedimentary rocks?
Mineral composition Mineral composition is the primary basis for distinguishing among the various clastic, detrital sedimentary rocks.
What is the primary basis for distinguishing among detrital rocks quizlet?
Particle size is the primary basis for distinguishing among detrital rocks. It is convenient and provides useful information about environments of deposition. Describe how sediments become sorted.
How do we distinguish various detrital sedimentary rocks?
Detrital sedimentary rocks are mainly classified by the size of their grain. The largest grain is a boulder, followed by a cobble, a pebble, sand, silt and finally the finest grain, which is clay. These grains of sediments are what get cemented together to form sedimentary rocks.
What is the primary basis for classifying detrital rocks?
Particle shape is the primary basis for distinguishing among various detrital sedimentary rocks.
What are the primary constituents of detrital sedimentary rocks?
The two chief constituents of detrital rocks are clay minerals and quartz. Limestone, composed chiefly of the mineral calcite, is the most abundant chemical sedimentary rock. Shale is far more common than other sedimentary rocks.
What is the primary basis upon which clastic textured sedimentary rocks are classified?
Clastic sediments or sedimentary rocks are classified based on grain size, clast and cementing material (matrix) composition, and texture. The classification factors are often useful in determining a sample's environment of deposition.
What are the four particle sizes typically found in detrital sedimentary rocks?
Sedimentary Rocks, Part 1: Clastic rocks
| Size Range | Particle name | Detrital rock |
|---|---|---|
| >256mm 64-256 4-64 2-4 | boulder cobbles pebbles granules | breccia or conglomerate |
| 1/16-2 | sand | sandstone |
| 1/256-1/16 <1/256 | silt clay | shale or mudstone |
What does grain size indicate about how a sedimentary rock formed?
Sedimentary rocks form whenever these sediments are deposited and lithified and can be classified based on the size of their grains. Gravel forms coarse rocks with grains over 2 mm in size. If the fragments are rounded, they form conglomerate, and if they are angular, they form breccia.
How is grain size used to identify and classify detrital sedimentary?
Detrital sedimentary rocks are mainly classified by the size of their grain. The largest grain is a boulder, followed by a cobble, a pebble, sand, silt and finally the finest grain, which is clay. These grains of sediments are what get cemented together to form sedimentary rocks.
What describes the range in particle sizes in a detrital sedimentary rock?
Sedimentary Rocks, Part 1: Clastic rocks
| Size Range | Particle name | Detrital rock |
|---|---|---|
| >256mm 64-256 4-64 2-4 | boulder cobbles pebbles granules | breccia or conglomerate |
| 1/16-2 | sand | sandstone |
| 1/256-1/16 <1/256 | silt clay | shale or mudstone |
When categorizing clastic or detrital sedimentary rocks What characteristics are used?
Clastic rocks are classified by grain shape, grain size, and sorting. Chemical sedimentary rocks are precipitated from water saturated with dissolved minerals. Chemical rocks are classified mainly by the composition of minerals in the rock.
Which type of sedimentary rock is classified on the basis of grain size?
Terrigenous clastic sedimentary rocks Terrigenous clastic sedimentary rocks are further subdivided on the basis of the mean grain diameter that characterizes most fragments, using the generally accepted size limits.
What does grain size tell you about sedimentary rocks?
Grain size determines just how far a piece of sediment can travel before coming to a halt. Clastic sediments form a wide range of rocks, from mudstone to conglomerate, and soil depending on their grain size.
What determines grain size in sedimentary rocks?
Three different but related properties determine particle shape: form, roundness, and surface texture.