plutonism

Plutonic theory is the geologic theory proposed by James Hutton around the turn of the 19th century that volcanic activity was the source of rocks on the surface of the Earth. It was named for Pluto, the ancient Roman god of the underworld. This replaced Abraham Werner's Neptunism theory, which claimed that rocks had originated from a great flood and were basically sedimentary in origin.
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(n.)
The theory, early advanced in geology, that the successive rocks of the earth's crust were formed by igneous fusion; -- opposed to the Neptunian theory.
  

geol. plutonism

plutonism /'plu:tənizm/
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