Dynamics and timing of metamorphic processes in exhumation channels at the continent-continent interface:comparative target areas in NW Newfoundland and W Argentina
Final Report Abstract
Selected metamorphic rocks of the Canadian Appalachian Mountain Range were investigated to better understand processes in the collisional zone between a microcontent and a continental plate mainly by the determination of pressure-temperature trajectories. Such rocks were micaschists from the Pocologan Metamorphic Suite in southern New Brunswick and the Fleur-de-Lys Belt in northeast Newfoundland as well as eclogite and gneiss of the Fleur-de-Lys Belt. Results published so far refer to eclogite as well as micaschist from the Pocologan Metamorphic Suite. The studies of gneiss and micaschist from the Fleur-de-Lys Belt should still be published. The overall result is that oblique collisions of microplates with Laurentia occurred. These collisions led to continental subduction at the margin of the collisional zones. This subduction produced highpressure metamorphic rocks, which experienced maximum pressures around 18 kbar at temperatures of 530-580°C (rocks of the Fleur-de-Lys Belt). Polycyclic metamorphism recognized in some rocks (gneisses of the Fleur-de-Lys Belt, micaschists of the Pocologan Metamorphic Suite) resulted from the subsequent oblique collision of microplates in the range of previously established collisional zones in the Canadian Appalachian Mountain Range.
Publications
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Formation of biotite-bearing eclogite: an example from the Fleur-de-Lys Supergroup of Newfoundland. - 12th International Eclogite Conference, Åre, Sweden, Abstract book and mid-conference excursion field guide, 92.
Massonne H.-J., Van Staal, C. & Willner, A.P.
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Geochemical characteristics of eclogite-amphibolite bodies in the Fleur-de-Lys Supergroup of Newfoundland. - 12th International Eclogite Conference, Åre, Sweden, Abstract book and mid-conference excursion field guide, Abstract book and mid-conference excursion field guide, 93.
Massonne H.-J. Opitz, J., Van Staal, C. & Willner, A.P.
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The Pocologan metamorphic suite of southern New Brunswick, Canada: New constraints on age and conditions of medium- to high-pressure metamorphism on the Ganderian margin of the Rheic Ocean. Tectonophysics, 747-748, 177-190.
Massonne, Hans-Joachim; Barr, Sandra M.; White, Chris E. & Miller, Brent V.
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Geochemical and petrographic characteristics of eclogite-amphibolite bodies in the northern Fleur-de-Lys Supergroup of NE Newfoundland, Canada. Neues Jahrbuch für Mineralogie - Abhandlungen, 198(1), 1-23.
Massonne, Joachim; Opitz, Joachim & van, Staal Cees
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Eclogite with biotite porphyroblasts—Which conditions are responsible for their formation? An example from the northern Fleur‐de‐Lys Supergroup, Newfoundland, Canada. Journal of Metamorphic Geology, 42(3), 291-318.
Massonne, Hans‐Joachim
