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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
December 23, 2020 • 19:53 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
. greywacke sandstone indicates: a. active provenance tectonics and prolonged transport b. stable provenance and prolonged trans- port c. active provenance tect
. Greywacke sandstone indicates: A. Active provenance tectonics and prolonged transport B. Stable provenance and prolonged trans- port C. Active provenance tectonics and less trans- port D. Stable provenance and less transport (BHU-2012)
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Owishi Sarkar
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The answer should be C) active provenance tectonics and less transport. As greywackes have more matrix and are poorly sorted it forms due to less transport of sediments.
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Rahul kumar
Answer: Active provenance and less transport Greywacke are immature sedimentary rocks dominantly composed of framework grains like feldspar and lithic fragments with high matrix content. Abundance of feldspar and lithic fragments require active provenance condition. Also, the transport distance should be lesson order to embody the relatively unstable minerals such as feldspar. In stable provenance condition and prolonged transportation, quartz arenite will form.
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but sir dekhajaye toh feldspar bhi kafi stables hota hai.
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Yes, they aren't unstable. But when you will compare feldspar with major framework mineral (Quartz) of sandstones then feldspar will be unstable. Also feldspars have a wide range of composition. Plagioclase feldspars (Anorthite) are relatively unstable in comparison with alkali feldspar (Muscovite).
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kya greywacke and felspathic wacke same hota hai..
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bcoz for wacke and arenite we are only known for their matrix.
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Sajan sarthak Best Answer
Greywacke is a kind of sandstone in which the sand grains are set in a fine “muddy” matrix. The fine grained matrix is at once the essential characteristic of greywacke and the essence of the greywacke. It is formed in actively provenance tectonics but less prolonged time.