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XERCISE 6.7 Recognizing Sediment Deposited by Streams, Wind, and Glaciers lame: ourse:. Il in the following table to summarize the characteristics of sediment deposited by the transporting agents listed. Section: Date: Agent of transportation Textural feature Streams Wind Glaciers Grain size Sorting Grain shape called sediment maturity: the degree to which a sediment has changed during trans- portation and deposition. The changes it can undergo include changes in grain size and shape by the physical processes described above as well as the loss of easily weathered minerals by chemical reactions. For example, if sediment accumulates quickly and close to its source, it generally contains a variety of grain sizes and is poorly sorted. Also, if chemical weathering has not progressed to completion, relatively unstable minerals (e.g., feldspar, mica, and amphibole) will be mixed with stable minerals (e.g., quartz). Finally, since grains have not traveled far, they may retain their original angular shapes. Geologists refer to a sediment with these characteristics as immature. If, however, the sediment is carried a long distance by a river over a long time, or is washed by wave action along a shore, and if the sediment has time to undergo substantial chemical weathering so that unstable minerals transform into clay and wash away, it will be quite different–better sorted, made almost entirely of stable minerals, and with grains that are well rounded. Geologists refer to sediments with these combined mineralogical and textural characteristics as mature (FIG. 6.8). URE 6.8 Sediment maturity. As sediments are transported progressively farther, weatherable minerals such as feld- break down and convert to clay, which washes away, so the proportion of sediment consisting of resistant minerals such uartz increases. Further, the physical bouncing and grinding that accompanies the transport of sediment progressively ds the quartz grains and sorts them. Increasing distance of transport

XERCISE 6.7 Recognizing Sediment Deposited by Streams, Wind, and Glaciers lame: ourse:. Il in the following table to summarize the characteristics of sediment deposited by the transporting agents listed. Section: Date: Agent of transportation Textural feature Streams Wind Glaciers Grain size Sorting Grain shape called sediment maturity: the degree to which a sediment has changed during trans- portation and deposition. The changes it can undergo include changes in grain size and shape by the physical processes described above as well as the loss of easily weathered minerals by chemical reactions. For example, if sediment accumulates quickly and close to its source, it generally contains a variety of grain sizes and is poorly sorted. Also, if chemical weathering has not progressed to completion, relatively unstable minerals (e.g., feldspar, mica, and amphibole) will be mixed with stable minerals (e.g., quartz). Finally, since grains have not traveled far, they may retain their original angular shapes. Geologists refer to a sediment with these characteristics as immature. If, however, the sediment is carried a long distance by a river over a long time, or is washed by wave action along a shore, and if the sediment has time to undergo substantial chemical weathering so that unstable minerals transform into clay and wash away, it will be quite different–better sorted, made almost entirely of stable minerals, and with grains that are well rounded. Geologists refer to sediments with these combined mineralogical and textural characteristics as mature (FIG. 6.8). URE 6.8 Sediment maturity. As sediments are transported progressively farther, weatherable minerals such as feld- break down and convert to clay, which washes away, so the proportion of sediment consisting of resistant minerals such uartz increases. Further, the physical bouncing and grinding that accompanies the transport of sediment progressively ds the quartz grains and sorts them. Increasing distance of transport

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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EXERCISE 6.7 Recognizing Sediment Deposited by Streams, Wind, and Glaciers Name: Section: Course: Date: Fill in the following table to summarize the characteristics of sediment deposited by the transporting agents listed. Agent of transportation Textural feature Streams Wind Glaciers Grain size Sorting Grain shape called sediment maturity: the degree to which a sediment has changed during trans- portation and deposition. The changes it can undergo include changes in grain size and shape by the physical processes described above as well as the loss of easily weathered minerals by chemical reactions. For example, if sediment accumulates quickly and close to its source, it generally contains a variety of grain sizes and is poorly sorted. Also, if chemical weathering has not progressed to completion, relatively unstable minerals (e.g., feldspar, mica, and amphibole) will be mixed with stable minerals (e.g., quartz). Finally, since grains have not traveled far, they may retain their original angular shapes. Geologists refer to a sediment with these characteristics as immature. If, however, the sediment is carried a long distance by a river over a long time, or is washed by wave action along a shore, and if the sediment has time to undergo substantial chemical weathering so that unstable minerals transform into clay and wash away, it will be quite different-better sorted, made almost entirely of stable minerals, and with grains that are well rounded. Geologists refer to sediments with these combined mineralogical and textural characteristics as mature (FIG. 6.8). FIGURE 6.8 Sediment maturity. As sediments are transported progressively farther, weatherable minerals such as feld- spar break down and convert to clay, which washes away, so the proportion of sediment consisting of resistant minerals such as quartz increases. Further, the physical bouncing and grinding that accompanies the transport of sediment progressively rounds the quartz grains and sorts them. Increasing distance of transport
Transcribed Image Text:EXERCISE 6.7 Recognizing Sediment Deposited by Streams, Wind, and Glaciers Name: Section: Course: Date: Fill in the following table to summarize the characteristics of sediment deposited by the transporting agents listed. Agent of transportation Textural feature Streams Wind Glaciers Grain size Sorting Grain shape called sediment maturity: the degree to which a sediment has changed during trans- portation and deposition. The changes it can undergo include changes in grain size and shape by the physical processes described above as well as the loss of easily weathered minerals by chemical reactions. For example, if sediment accumulates quickly and close to its source, it generally contains a variety of grain sizes and is poorly sorted. Also, if chemical weathering has not progressed to completion, relatively unstable minerals (e.g., feldspar, mica, and amphibole) will be mixed with stable minerals (e.g., quartz). Finally, since grains have not traveled far, they may retain their original angular shapes. Geologists refer to a sediment with these characteristics as immature. If, however, the sediment is carried a long distance by a river over a long time, or is washed by wave action along a shore, and if the sediment has time to undergo substantial chemical weathering so that unstable minerals transform into clay and wash away, it will be quite different-better sorted, made almost entirely of stable minerals, and with grains that are well rounded. Geologists refer to sediments with these combined mineralogical and textural characteristics as mature (FIG. 6.8). FIGURE 6.8 Sediment maturity. As sediments are transported progressively farther, weatherable minerals such as feld- spar break down and convert to clay, which washes away, so the proportion of sediment consisting of resistant minerals such as quartz increases. Further, the physical bouncing and grinding that accompanies the transport of sediment progressively rounds the quartz grains and sorts them. Increasing distance of transport
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