Igneous rocks form from magmas, and most magmas are associated with plate tectonics. Mafic (basaltic) and ultramafic magmas form along the divergent midoceanic ridges and are major components of new oceanic crust. More felsic magmas, such as andesites and rhyolites, are associated with the edges of continental crust at subduction zones along converging plate boundaries. Whether a magma is intermediate or felsic may depend on the relative amounts of oceanic crust and continental crust in the subduction zone that melt to form the magma. The great abundance of granitic intrusions in continental crust is thought to be related to the partial melting of the lower continental crust.
Intraplate igneous activity occurs in the interior of a single continental plate and is thought to be related to mantle plumes (such as the eruptions at Yellowstone National Park) or flood basalts. Intraplate activity is not associated with moving plate boundaries such as subduction zones.
Antarctica once belong of the Gondawa that was called a
super continent, at that time the Antarctica was surfaced with forest and had
coastal warm currents on its shores. And
when the Antarctica detach from the
continent Gondwana and moved to the south, it begin to change the waters
cooled, the temperatures dropped, the forest disappeared, and the snow begin to
covered the land then was compacted into
ice over time, all combining to create coal deposits.
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