- Acadian orogeny
The Acadian orogeny is a middle
Paleozoicdeformation, especially in the northern Appalachians, between New York and Newfoundland. In Gaspéand adjacent areas, its climax is dated as early in the Late Devonian, but deformational, plutonic, and metamorphic events extended into Early Mississippiantime. The Acadian should be regarded, not as a single orogenic episode, but rather as an orogenic era.
It appears to have been contemporaneous with the Bretonic phase of the
Variscan orogenyof Europe, with metamorphic events in southwestern Texasand northern Mexico, and with the Antler orogenyof the Great Basin.
A period of lithospheric thinning that followed the Acadian orogeny created
volcanoes, such as the large Mount Pleasant Calderain southwestern New Brunswick, Canada.
Orogeny- 'mountain building'
*Dictionary of Geological Terms, 3rd. Edition,1984, Robert L. Bates and Julia A. Jackson, Eds., prepared by The American Geological Institute
*International Tectonic Dictionary, 1967, Memoir 7, "Am. Assoc. Petroleum Geologists", p. 114
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Acadian orogeny — Mountain building event that affected the northern portion of the Appalachian Geosyncline from present day New York to Newfoundland during the Devonian period. The orogeny was most intense in northern New England. Its origin has been ascribed to… … Universalium
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