Precambrian plate tectonics

seismic evidence from Northern Hudson Bay, Canada

Ian D Bastow, David A Thompson, James Wookey, J-Michael Kendall, George Helffrich, David B Snyder, David W Eaton, Fiona A Darbyshire

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The Canadian Shield is one of the largest exposures of Precambrian rocks on Earth. It is a mosaic of several Archean terranes that were brought together during a series of Paleoproterozoic orogens culminating in the so-called Trans-Hudson orogen, which is thought to have been similar to the Himalayan orogen in scale and nature. The tectonic evolution and lithospheric subdivisions of this region are poorly understood, but new seismic networks in northern Hudson Bay provide fresh opportunity to place constraints on the Precambrian processes that formed and shaped it. We show, via a study of seismic anisotropy, that the lithosphere of the northern Hudson Bay region retains a strong signature of Archean–Paleoproterozoic tectonics. We map the boundary between the upper (Churchill) and lower (Superior) plates that collided ca. 1.8 Ga and identify back azimuth–dependent splitting parameters (ϕ, δt) on Baffin Island that indicate complex anisotropy (e.g., dipping fabric) beneath the region. Our results support the view that significant lithospheric deformation occurred during the Paleoproterozoic and that modern-day plate tectonic processes were thus in operation by at least ca. 1.8 Ga.
Original languageEnglish
Pages (from-to)91-94
Number of pages4
JournalGeology
Volume39
Issue number1
Early online date3 Dec 2010
DOIs
Publication statusPublished - Jan 2011

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plate tectonics
Precambrian
seismic anisotropy
tectonic evolution
Archean
terrane
shield
lithosphere
anisotropy
tectonics
rock

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Bastow, I. D., Thompson, D. A., Wookey, J., Kendall, J-M., Helffrich, G., Snyder, D. B., ... Darbyshire, F. A. (2011). Precambrian plate tectonics: seismic evidence from Northern Hudson Bay, Canada. Geology, 39(1), 91-94. https://doi.org/10.1130/G31396.1

Precambrian plate tectonics : seismic evidence from Northern Hudson Bay, Canada. / Bastow, Ian D; Thompson, David A; Wookey, James; Kendall, J-Michael; Helffrich, George; Snyder, David B; Eaton, David W; Darbyshire, Fiona A.

In: Geology, Vol. 39, No. 1, 01.2011, p. 91-94.

Research output: Contribution to journalArticle

Bastow, ID, Thompson, DA, Wookey, J, Kendall, J-M, Helffrich, G, Snyder, DB, Eaton, DW & Darbyshire, FA 2011, 'Precambrian plate tectonics: seismic evidence from Northern Hudson Bay, Canada', Geology, vol. 39, no. 1, pp. 91-94. https://doi.org/10.1130/G31396.1
Bastow ID, Thompson DA, Wookey J, Kendall J-M, Helffrich G, Snyder DB et al. Precambrian plate tectonics: seismic evidence from Northern Hudson Bay, Canada. Geology. 2011 Jan;39(1):91-94. https://doi.org/10.1130/G31396.1
Bastow, Ian D ; Thompson, David A ; Wookey, James ; Kendall, J-Michael ; Helffrich, George ; Snyder, David B ; Eaton, David W ; Darbyshire, Fiona A. / Precambrian plate tectonics : seismic evidence from Northern Hudson Bay, Canada. In: Geology. 2011 ; Vol. 39, No. 1. pp. 91-94.
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