Palaeomagnetism of early Cambrian Brigus red shale, eastern Newfoundland

Details Palaeomagnetism of early Cambrian Brigus red shale, eastern Newfoundland Palaeomagnetism of early Cambrian Brigus red shale, eastern Newfoundland

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...56..242s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 56, Issue 3-4, p. 242-253.

Physics

1

Scientific paper

Studies of the early Cambrian Brigus (BR) red shale exposed in Conception Bay yielded a single, stable mean remanence direction of D = 265°, I = + 58° (reverse polarity) before tilt correction and D = 279°, I = + 48°, k = 47, α95 = 6.9° for N = 7 sites (25 samples) after correction for gentle tilt; the corresponding (North pole palaeopole) position is 27°S, 51°E (dp, dm = 6°, 9°). This magnetization is characterized by a linear vector trajectory at higher unblocking temperature (TUB) spectra (400-680° C). The magnetization directions at the low TUB range (400°C) are more variable from sample to sample, although they typically have steep downward inclinations, with no evidence of Kiaman overprinting. Marginal but not statistically significant improvement (k = 44-77) in the grouping of site means after tilt correction suggests that the predominant, univectorial westerly remanance was probably acquired after deposition.
Based on both geological and magnetic evidence, the Brigus Shale Formation appears to be remagnetized during Siluro-Devonian times. The position of the far-sided antipole BR (27°N, 129°W) located in the vicinity of the pole for the Cambrian Morrison River Formation (MR at 20°N, 146°W), which is discordant from the younger Palaeozoic (Late Ordovician-Carboniferous) poles reported for the Avalon Zone, is fortuitous. Since the magnetization of BR is most likely secondary, the magnetization is younger than the Iapetus closure date determined geologically (Late Ordovician). Consequently, the displacement of the Avalon Zone with respect to the North American craton cannot be estimated; the width of the Proto-Atlantic Ocean cannot be calculated.
Present address: Haileybury School of Mines, Haileybury, Ontario, POJ 1KO Canada.

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