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Journal of Petrology Advance Access published online on November 3, 2006
Journal of Petrology, doi:10.1093/petrology/egl060
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received May 26, 2005
Accepted September 21, 2006

Original Papers

Polymetamorphic Evolution of the Trans-Hudson Orogen, Baffin Island, Canada: Integration of Petrological, Structural and Geochronological Data

M. R. St-Onge 1 *, N. Wodicka 1, and O. Ijewliw 1

1 Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada, K1A 0E8

* To whom correspondence should be addressed.
M. R. St-Onge, E-mail: mstonge{at}nrcan.gc.ca


  Abstract

Supracrustal units metamorphosed at mid-crustal conditions within the Paleoproterozoic Trans-Hudson Orogen are preserved within an obliquely exposed continental collision zone on Baffin Island (Canada). Early granulite-facies assemblages yield thermobarometric data and phase diagram information that define a steep, compressive P-T path segment. These assemblages are bracketed between ca. 1849 and 1835 Ma, and are interpreted to result from (1) heat advection by an 1865 +4/-2 to 1848 ± 2 Ma Andean-type granitic batholith, and (2) a ca. 1845 Ma crustal thickening event associated with accretion of an intra-oceanic arc terrane. A subsequent regional metamorphic event is characterized by the growth of retrograde, upper amphibolite-facies assemblages that define a clockwise, decompressive P-T path. Mineral growth is bracketed between 1820 ± 1 and 1813 ± 2 Ma, and is localized within deformation zones associated with the 1820 +4/-3 to 1795 ± 2 Ma collision of the Rae and Superior cratons. The metamorphic history of Baffin Island supports a progressive change from plate-margin to intraplate processes within an evolving convergent orogen during the Paleoproterozoic that is similar to those documented in younger collisional belts.

Keywords: polymetamorphism; geochronology; Paleoproterozoic; Trans-Hudson Orogen.
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