Paleomagnetism of the Society Cliffs dolostone and the age of the Nanisivik zinc deposits, Baffin Island, Canada |
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| Authors: | D T A Symons T B Symons D F Sangster |
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| Institution: | (1) Earth Sciences, School of Physical Sciences, University of Windsor, Windsor, Ontario, N9B 3P4, Canada e-mail: dsymons@uwindsor.ca Tel.:+1-519-2533000, ext. 2493; Fax: +1-519-9737081, CA;(2) 2335 Russvern Dr., North Gower, Ontario, K0A 2T0, Canada, CA |
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| Abstract: | Dolostones of the ∼1200 Ma Society Cliffs Formation within the hydrothermal zone surrounding the Nanisivik zinc deposits
retain a stable characteristic remanent magnetization (ChRM) on alternating field and thermal step demagnetization. Based
on the thermal data and saturation isothermal remanence analyses, the ChRM resides in pseudosingle domain magnetite and hematite.
A paleomagnetic fold test favours a post-folding ChRM, and a paleomagnetic contact test, using a Franklin gabbro dike, indicates
that the ChRM predates ∼720 Ma. The pole position calculated from the ChRM direction is at 168.2°E, 42.8°N (δp=4.9°, δm=6.8°), giving an age of 1095 ± 10 Ma on the well-defined “Logan Loop” portion of the North American apparent polar wander
path. This age is considered to date recrystallization of the dolostone host rocks in the halo around the hydrothermal sulfide
deposits. No evidence is found for a postulated Cretaceous remagnetization event in the region.
Received: 9 January 1999 / Accepted: 3 March 2000 |
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