- GLOSSARY OF VOLCANIC TERMS
Melting that occurs when rocks undergo a decrease in pressure. This commonly occurs in the vicinity of hot spots as mantle rocks rise to shallower levels in the earth due to convective rise and upwelling (Sigurdsson, 2000, p. 15). Melting occurs as a result of decreasing pressure, not increasing temperature.
Glossary of volcanic terms. - University of Wisconsin Oshkosh. G. J. Hudak. 2001.
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hot spot — GLOSSARY OF VOLCANIC TERMS An area, generally located in the middle of a lithospheric plate, characterized by anomalous heat flow. Mantle material rises toward the earth s surface and undergoes decompressive melting at hot spots which may form… … Glossary of volcanic terms
Trans-Hudson orogeny — [ North American craton, also called Laurentia.] [ Wyoming, Superior and Hearne cratons] The Trans Hudson orogeny, Trans Hudsonian orogeny, Trans Hudson orogen (THO), or Trans Hudson Orogen Transect (THOT), (also referred to as the Trans… … Wikipedia