Evidence for ultrahigh-pressure metamorphism discovered in the Appalachian orogen

  title={Evidence for ultrahigh-pressure metamorphism discovered in the Appalachian orogen},
  author={Joseph P. Gonzalez and et al.},
The Appalachian orogen has long been enigmatic because, compared to other parts of the Paleozoic orogens that formed following the subduction of the Iapetus Ocean, direct evidence for ultrahigh-pressure (UHP) metamorphism has never been found. We report the first discovery of coesite in the Appalachian orogen in a metapelite from the mid-Ordovician (Taconic orogeny) Tillotson Peak Complex in Vermont (USA). Relict coesite occurs within a bimineralic SiO2 inclusion in garnet. In situ elastic… 
SKS Splitting and Upper Mantle Anisotropy Beneath the Southern New England Appalachians: Constraints From the Dense SEISConn Array
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Elastic Geobarometry for Anisotropic Inclusions in Anisotropic Host Minerals: Quartz‐in‐Zircon
Current models for elastic geobarometry have been developed with the assumption that the host and/or inclusion minerals are elastically isotropic. This assumption has limited applications of elastic


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Eclogite-Bearing Amphibolites from the Appalachian Mobile Belt, Northwest Newfoundland: Dry versus Wet Metamorphism
Eclogite-bearing amphibolites from the western marginal metamorphic zone of the Appalachian mobile belt (the orthotectonic zone), northwest Newfoundland, were derived from basaltic dikes
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A tectonized ultramafic-mafic-pelitic package southwest of the Burgess Branch Fault Zone in the Rowe/Prospect Rock slice in Stockbridge, Vermont preserves Taconian subduction zone metamorphism. The
Timing of tectonometamorphism across the Green Mountain anticlinorium, northern Vermont Appalachians: 40Ar/39Ar data and correlations with southern Quebec
In the pre-Silurian lithotectonic units of the northern Vermont Appalachians, the timing of orogenesis and tectonometamorphism has traditionally been ascribed to the combined effects of the Middle
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Abstract During the Early to Middle Palaeozoic, prior to formation of Pangaea, the Canadian and adjacent New England Appalachians evolved as an accretionary orogen. Episodic orogenesis mainly
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A pyrope-quartzite originally described by Vialon (1966) from the Dora Maira massif was resampled and reinvestigated. Garnet (up to 25 cm in size), phengite, kyanite, talc and rutile are in textural
Neoproterozoic high‐pressure/low‐temperature metamorphic rocks in the Avalon terrane, southern New Brunswick, Canada
High‐P/low‐T metamorphic rocks of the Hammondvale metamorphic suite (HMS) are exposed in an area of 10 km2 on the NW margin of the Caledonian (Avalon) terrane in southern New Brunswick, Canada. The