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Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary.
Igneous rocks are formed from the solidification of Earth is composed predominantly of a large mass of igneous rock with a very thin veneer of weathered material—namely, sedimentary rock.
Their emanations have provided the water for the oceans, the gases for the primordial oxygen-free atmosphere, and many valuable mineral deposits.) was erupted from Ol Doinyo Lengai, a volcano in northern Tanzania, Africa.
Because of the limited occurrence of such carbonate-rich igneous rocks, however, the following discussion will consider the chemistry of silicate rocks only.
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Both intrusive and extrusive magmas have played a vital role in the spreading of the ocean basin, in the formation of the oceanic crust, and in the formation of the continental margins.
Igneous processes have been active since the onset of the formation of the Earth some 4.6 billion years ago.
Because of the high temperatures within the Earth, the principles of chemical equilibrium are applicable to the study of igneous and metamorphic rocks, with the latter being restricted to those rocks formed without the direct involvement of magma.
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