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Pritiprabha Behera posted an Question
July 29, 2020 • 04:11 am
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30 points
30 points
- IIT JAM
- Geology (GG)
Why dolostone is reffered as chemically formed sedimentary rock?
why dolostone is reffered as chemically formed sedimentary rock?
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Pritiprabha behera
what is the meaning of chemically precipitated sedimentary rock?
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Rahul kumar Best Answer
Any rock formed as a result of precipitation is considered as chemically formed sedimentary rock. The term dolostone, proposed to specifically refer to the rock type composed of the mineral dolomite. Almost all dolomite is produced by converting CaCO3 minerals into the mineral dolomite after the initial precipitation of either calcium carbonate mineral. This conversion process is referred to as dolomitization. Dolomitization can take place almost immediately after limestone forms (penecontemporaneously), within a few days, weeks, or months of limestone formation (syngenetic dolomitization), or long after (years or even millions of years) (epigenetic dolomitization). Because virtually all dolomites were originally limestone it is appropriate to first discuss completely the process by which limestone is formed. Since, limestone is considered as chemically formed sedimentary rock that's dolostone is also a chemically formed sedimentary rock.
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Sajan sarthak
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Dolostone is formed FROM dolomite i.e CaMg(Co3)2 and this is a chemically precipitated mineral from the solution. And during sedimentation it is formed so dolostone is a chemically precipitated sedimentary rock. Generally all the carbonate rocks are formed from dissolved solution either or from hard skeletal part aggregate.
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Rahul kumar
Chemically precipitated sedimentary rocks means any rock generated by chemical processes for eg. materials dissolved in seawater becomes oversaturated as a result of change in P-T conditions, which leads to the precipitation in solid form.