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Distinguish between Dyke and Sill or Discordant and Concordant bodies

written 7.4 years ago by jagmohanintouch • 0

modified 6.1 years ago by ddigantarroy • 0

engineering geology

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written 7.4 years ago by jagmohanintouch • 0

modified 7.3 years ago by ddigantarroy • 0

Dykes (Discordant type)	Sill (Concordant type)
Dykes are discordant igneous bodies of more or less tabular shape and exhibiting a cross -cutting relationship with the country rocks .	Sills are tabular concordant igneous bodies lying parallel to the structure of the country rocks .
They occur commonly in the form of wall like masses of exactly or nearly vertical attitude	They are commonly sheet like masses , occurring within the country rocks and may be variable thickness
Dykes are commonly formed due to development of cracks within country rocks and their subsequent filling up with the igneous intrusives	Their mode of occurrence parallel to the bedding planes of the sedimentary rocks forming the region is suggestive , to lay man , of their belonging to the sedimentary rocks series , in which they actually occur as intrusive bodies .

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