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- W92921101 abstract "S-type Devonian acidic intrusives in northern Vermont occur scattered throughout the turbiditic flysch sequence and pervasive horizon of mafic Standing Pond Volcanics of the Connecticut Valley--Gaspe Trough (CVGT). These granitoids formed in a successor basin that opened over the stalled Taconic subduction zone located between the Bronson Hill--Boundary Mountain Volcanic arc (east) and the ophiolite-bearing accretionary complex of the Green Mountains (west). Contact aureoles surrounding the granitoids are superimposed over low-pressure facies series metamorphic isograds that have concentric pattern correlated with the centers of intrusion. Italy's Tuscan Magmatic Province, also dominated by S-type acidic intrusives, developed between 7 and 2 Ma in a successor basin over an extinct subduction zone. In that case, the basin and its plutons developed when the Corsica-Sardinia plate pulled back to form the Tyrrhenian Sea after having collided with Italy to form the Apennine range approximately 10 m.y. earlier. In this model for northern Vermont, a volcanic arc and accretionary complex developed during Ordovician subduction, perhaps with continuing trench--arc separation due to shallow subduction. When the leading edge of continental North America entered the subduction zone, the process stalled and the subducted Iapetus slab continued to lose heat and increase density, promoting its separation frommore » the overlying plate. Upwelling under the former forearc region rifted the crust to form the CVGT. The mantle-derived mafic melts rose, transferring heat to metamorphose and partially melt the basin fill. The Standing Pond Volcanics represent this melt that reached the surface at one stage and flooded the basin. Northern Vermont's granitoids rose, penetrating the domed strata above their source region, as extensional tectonism was replaced by Acadian compression.« less" @default.
- W92921101 created "2016-06-24" @default.
- W92921101 creator A5006309333 @default.
- W92921101 date "1993-03-01" @default.
- W92921101 modified "2023-09-23" @default.
- W92921101 title "A model for northern Vermont's Acadian magmatism with insight from Italy's Tuscan magmatic province" @default.
- W92921101 hasPublicationYear "1993" @default.
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