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Research ArticleArticles

A tectonized ultramafic-mafic-pelitic package in Stockbridge, Vermont: Metamorphism resulting from subduction and exhumation

Ian W. Honsberger, Jo Laird and Peter J. Thompson
American Journal of Science November 2017, 317 (9) 1019-1047; DOI: https://doi.org/10.2475/09.2017.03
Ian W. Honsberger
Department of Earth Sciences, University of New Hampshire, Durham, New Hampshire 03824
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  • For correspondence: ian.honsberger@canada.ca
Jo Laird
Department of Earth Sciences, University of New Hampshire, Durham, New Hampshire 03824
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Peter J. Thompson
Department of Earth Sciences, University of New Hampshire, Durham, New Hampshire 03824
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Abstract

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 polydeformed package consists of carbonatized and chloritized serpentinite lozenges that are faulted between graphitic phyllite and an intercalated zone of mafic greenstones and pelitic schists that retain primarily Taconian structures. Amphiboles zoned chemically in greenstones display decreases in PL (NaM4) and TK (AlVI + Fe3+ + 2Ti + Cr) from cores to rims. Pseudosection and amphibole isopleth calculations show that different greenstone bodies experienced peak subduction zone metamorphism at different depths between ∼19 and 32 Km (0.55–0.95 GPa) and/or at different temperatures between ∼425 and 500 °C. Barroisite and winchite cores preserve the highest pressure and lowest temperature peak metamorphism, which is interpreted as lower blueschist facies. All greenstones followed decompression cooling paths to lower greenschist facies where actinolite rims grew. Assembly of the ultramafic-mafic-pelitic package probably occurred in a Taconian exhumation channel containing mantle serpentinite, oceanic crust, and clastic rocks of the Laurentian margin and Iapetan Ocean basin.

  • Vermont
  • northern Appalachians
  • metamorphism
  • greenstone
  • amphibole
  • Prospect Rock slice
  • Iapetus Ocean
  • subduction
  • exhumation
  • pseudosection
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American Journal of Science: 317 (9)
American Journal of Science
Vol. 317, Issue 9
1 Nov 2017
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A tectonized ultramafic-mafic-pelitic package in Stockbridge, Vermont: Metamorphism resulting from subduction and exhumation
Ian W. Honsberger, Jo Laird, Peter J. Thompson
American Journal of Science Nov 2017, 317 (9) 1019-1047; DOI: 10.2475/09.2017.03

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A tectonized ultramafic-mafic-pelitic package in Stockbridge, Vermont: Metamorphism resulting from subduction and exhumation
Ian W. Honsberger, Jo Laird, Peter J. Thompson
American Journal of Science Nov 2017, 317 (9) 1019-1047; DOI: 10.2475/09.2017.03
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    • INTRODUCTION
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Keywords

  • Vermont
  • northern Appalachians
  • metamorphism
  • greenstone
  • amphibole
  • Prospect Rock slice
  • Iapetus Ocean
  • subduction
  • exhumation
  • pseudosection

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