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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Shivam Sharma posted an Question
September 06, 2020 • 21:52 pm
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30 points
30 points
- CSIR NET
- Earth Sciences
) name four basic allochemical and two orthochemical constituents of limestone. (i) arrange the following limestones in order of decreasing depositional energy
) Name four basic allochemical and two orthochemical constituents of limestone. (i) Arrange the following limestones in order of decreasing depositional energy conditions: Packstone, Grainstone, Mudstone, Wackestone ) What is textural maturity of sandstone? (1i) Name a sandstone that is texturally and mineralogically mature.
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Sajan sarthak
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. (i) Allochemical constituents: Intraclast, Ooid, Fossil, Pellet Orthochemical constituents: Micrite, Sparite
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Rahul kumar Best Answer
1. (i) Allochemical constituents: Intraclast, Ooid, Fossil, Pellet Orthochemical constituents: Micrite, Sparite (ii) Limestone in order of decreasing energy of depositional environment is given below. Limestone with high amount of mud will indicate least energy depositional environment and limestone with low amount of mud content will indicate high energy environment. Grainstone, Packstone, Wackestone, Mudstone Mudstone will have highest amount of mud (lowest energy condition) and grainstone will lack mud (highest energy environment) 2. (i) Textural maturity refers to the sorting of sandstone. High textural maturity refers to well sorted sandstone and low textural maturity refers to poorly sorted sandstone (ii) Quartz Arenite Quartz Arenite is mineralogically (because quartz is very abundant i.e. chemically stable) as well as textyrally mature (very low matrix content i.e. well sorted) rock.
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Sajan sarthak
As the matrix content increases the energy condition decrease
mOre the grain less high the energy