Acadian orogeny


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Acadian orogeny

[ə′kād·ē·ən ȯr′äj·ə·nē]
(geology)
The period of formation accompanied by igneous intrusion that took place during the Middle and Late Devonian in the Appalachian Mountains.
References in periodicals archive ?
Wedging of Ganderia by Avalonia during the initial stages of the Acadian orogeny may have uplifted Ganderia, forming highlands outboard of the Central Maine Basin that served as the source of the Carrabassett Formation sediments.
More studies have been conducted of and more has been written about the Acadian orogeny than any other New England orogenic event (e.
It represents a portion of Avalonia that was accreted to Laurentia during the Acadian orogeny.
This belt stretches from Massachusetts, through eastern Maine and into New Brunswick and represents a portion of Avalonia that was accreted to Laurentia during the Acadian orogeny (Berry and Osberg 1989; Ludman et al.
This mixed package of rocks was regionally deformed into northeast-trending, open to close, upright folds, and metamorphosed to mainly greenschist facies during the Acadian Orogeny at ~400 [+ or -] 10 Ma (Keppie and Dallmeyer 1987; Kontak et al.
Using a geothermal gradient of 25[degrees]C/km, which has been suggested for the Meguma terrane by Keppie and Dallmeyer (1995) during the Acadian Orogeny, a temperature of 300[degrees]C is indicated for the wall rocks.
This region was previously thought to have experienced only minor normal fault readjustments after the Middle Devonian Acadian Orogeny.
Upper Ordovician to Lower Devonian sedimentary rocks of the Honorat, Matapedia and Chaleurs groups, as well as volcanic rocks of the latter group, were first deformed by the Early to Middle Devonian Acadian Orogeny (Malo and Beland 1989; Malo etal.
These plutons reflect the resurgence of granite magma at the same crustal location after a very significant time gap and during the waning stages of the Acadian orogeny.
Extensive plutonism accompanied both phases of the Acadian orogeny.
The oldest shearing recognized in the Norumbega fault system in eastern Maine occurred in the Middle Devonian (~ 380 Ma), and is attributed to late-stage activity associated with the Acadian orogeny (West and Hubbard 1997; Ludman et al.
The Early to Middle Devonian Acadian orogeny is a tectonic event that has traditionally been attributed to the accretion of Avalonia to the North American craton (Osberg 1978; Dallmeyer et al.