Physics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.4051d&link_type=abstract
Journal of Geophysical Research, Volume 96, Issue B3, p. 4051-4064
Physics
8
Geomagnetism And Paleomagnetism: Reversals (Process, Timescale, Magnetostratigraphy), Geomagnetism And Paleomagnetism: Paleomagnetism Applied To Tectonics (Regional, Global)
Scientific paper
One hundred seventy-seven samples were taken in stratigraphic sequence in redbeds from approximately 2100 m of Namurian-Westphalian strata from the Shepody, Enragé, Boss Point, and lower Joggins formation between Minudie and Joggins, Nova Scotia, for the purpose of constructing a magnetic polarity stratigraphy. In addition, five samples from each of four sites were taken from north dipping strata of the Cumberland Group for the purpose of conducting a fold test for the Joggins Formation. This yields a total coverage of 412 samples from approximately 2400 m of south dipping strata in the composite section when combined with previous results from the Maringouin Peninsula (DieVenere and Opdyke, 1990) and 88 samples from north-dipping strata collected for the purpose of conducting fold tests. Two components of magnetization are identified in these sediments: a prefolding component, termed C, and a synfolding component, termed B. The present results extend the midCarboniferous magnetic polarity stratigraphy to include eight normal and eight reversed magnetozones in the Namurian A through early Westphalian A interval. The results are dominantly to completely reversed in samples from the remainder of the Westphalian A and the Westphalian B, but because of the complication of varying degrees of remagnetization and an 800 m sampling gap it is not possible to verify the base of the Permo-Carboniferous reversed superchron in this time period. Northward plate motion is inferred from an observed shallowing of inclinations upsection. A 5-7 cm/yr average poleward drift rate is calculated for this time period from these results, yielding a low-latitude southern hemisphere paleogeographic position.
DiVenere V. J.
Opdyke Neil D.
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