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Dike or Dyke

dike rock

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A body of rock which cuts through the surrounding layers is known as Dike. Dikes usually result from magma and they can also be formed from sediments. Sandstone dike is formed when gases and hydrocarbons went into the thick sand bed immediately after it was buried, while causing the and dike to rise into the overlying surface mud when all of its materials have not yet hardened to form stone. This discovery was made as a direct result of the preserved sandstone dikes which are basically made up of fossils communities, which live on such gases and hydrocarbons.


The igneous dike can be found in a Hawaiin volcanic crater. These are caused by molten basaltic magma which rose above and cut through the existing surface layers of basalt. The Igneous dikes are commonly found in many bodies of highly metamorphosed or plutonic rock. Where fluid or molten materials have over taken the pre-existing rock formations.

The peculiar feature of dike that tells is apart from other rocks is that it cuts through the underlying planes of any rock it is intruding out of. When this intrusion happens along the bedding planes, it is regarded as a sill. When looking at a simple flat-lying rock beds, sills are horizontal while dikes are vertical. When the rocks are folded and tilted, sills and dikes may be tilted too.

In the situation, above the true shape of a dike, which is three-dimensional is not exposed. However, it can still show that dikes must be thin, lobes or flat tongues. Dikes clearly intrude along the planes with the least resistance and where the rocks are in relative tension. As a result, the orientation of dikes can give a clue of the internal environment of the time of being formed. They are commonly oriented to line-up with the existing local patterns caused by jointing.


Additional Resources

Density   Diphosphorus Pentoxide   Dolomite

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