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GATE-Geology-and-Geophysics-Question-2012-->View question

Which one amongst the following rocks commonly has highest unconfined compressive strength? GATE-Geology and Geophysics-Question-2012

Which one amongst the following rocks commonly has highest unconfined compressive strength?
(A) Coarse-grained sandstone (B) Mica schist
(C) Fossiliferous limestone (D) Massive basalt

Asked On2017-07-06 12:36:53 by:Amogh

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Answer is: (D) Massive basalt
Unconfined compressive strength:
A measure of a material’s strength. The unconfined compressive strength (UCS) is the maximum axial compressive stress that a right-cylindrical sample of material can withstand under unconfined conditions—the confining stress is zero. It is also known as the uniaxial compressive strength of a material because the application of compressive stress is only along one axis—the longitudinal axis—of the sample.
Massive Basalt: Igneous rocks -- those which originate from magma -- fall into two categories: Extrusive and intrusive. Extrusive rocks erupt from volcanoes or seafloor fissures, or they freeze at shallow depths. This means that they cool relatively quickly and under low pressures, therefore they are typically fine grained and gassy. The other category is intrusive rocks, which solidify slowly at depth and do not release gases.
Some of these rocks are clastic, meaning they are composed of rock and mineral fragments, or clasts, rather than solidified melt. Technically, that makes them sedimentary rocks but these volcaniclastic rocks have many differences from other sedimentary rocks -- in their chemistry and the role of heat, especially. Geologists tend to lump them with the igneous rocks. Learn more about igneous rocks.
This basalt from a Columbia Plateau lava flow is fine grained (aphanitic) and massive (without layers or structure). See the basalt gallery.

Answerd on:2017-07-10 Answerd By:Aparna-Dasgupta

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