DEFINITION OF BOWEN, NORMAN LEVI (1887–1956)

Definition of Bowen, Norman Levi (1887–1956)

Canadian Petrologist, Geologist Dr. Norman Levi Bowen was one of the most

brilliant igneous petrologists in the 20th century. Although he

was born in Ontario, Canada, he spent most of his productive

research career at the Geophysical Laboratories of the

Carnegie Institute in Washington, D.C. Bowen studied the

relationships between plagioclase feldspars and iron-magnesium

silicates in crystallizing and melting experiments. Based

in these experiments, he derived the continuous and discontinuous

reaction series explaining the sequence of crystallization

and melting of these minerals in magmas. He also

showed how magmatic differentiation by fractional crystallization

can result from a granitic melt from an originally

basaltic magma through the gradual crystallization of mafic

minerals, leaving the felsic melt behind. Similarly, he showed

how partial melting of one rock type can result in a melt with

a different composition than the original rock, typically forming

a more felsic melt than the original rock, and leaving a

more mafic residue (or restite) behind. Bowen also worked on

reactions between rocks at high temperatures and pressures,

and the role of water in magmas. In 1928, N. L. Bowen published

his now-classic book, The Evolution of Igneous Rocks.

See also IGNEOUS ROCKS.

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