Paleomagnetism of the Paleoproterozoic hematitic breccia and paleosol at Ville-Marie, Québec: further evidence for the low paleolatitude of Huronian glaciation

Details Paleomagnetism of the Paleoproterozoic hematitic breccia and paleosol at Ville-Marie, Québec: further evidence for the low paleolatitude of Huronian glaciation Paleomagnetism of the Paleoproterozoic hematitic breccia and paleosol at Ville-Marie, Québec: further evidence for the low paleolatitude of Huronian glaciation

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999e%26psl.172..273s&link_type=abstract

Earth and Planetary Science Letters, Volume 172, Issue 3-4, p. 273-285.

Computer Science

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Scientific paper

The paleomagnetism of a saprolitic paleosol developed on Archean granite and of an overlying hematitic breccia in the basal Lorrain Formation of the Cobalt Group (Huronian Supergroup, ~2.4-2.3 Ga) near Ville-Marie, Québec, has been investigated to further constrain the paleolatitude of the Lorrain Formation and the subjacent glaciogenic Gowganda Formation. Only the breccia, whose hematite may be a product of weathering prior to or shortly after deposition, yielded useable results with stepwise thermal demagnetization. A stable component A (maximum unblocking temperature, Tub, of ~675°C) carried by hematite is directed shallowly to the east-northeast (/D=59.5°, /I=2.4°, α95=6.7°, /n=47, dip-corrected), and a less stable component B (maximum Tub of ~580°C) carried by magnetite is directed steeply down to the northeast (/D=52.1°, /I=70.3°, α95=2.8°, /n=75, dip-corrected). Component A is ascribed to a chemical remanent magnetization (CRM) acquired when the hematitic breccia was deposited or soon thereafter. Component B is interpreted as a thermochemical overprint related to the Penokean Orogeny at 1.9-1.8 Ga. Dip-corrected specimen mean directions give the pole positions at latitude = 57.1°N, longitude = 338.3°E (dp = 4.1°, dm = 4.8°) for component B, and latitude = 21.1°S, longitude = 213.1°E (dp = 3.3°, dm = 6.7°) for component A. The more easterly directions for components A and B relative to comparable early and overprint components previously determined for the Lorrain and Gowganda formations at Elliot Lake and Desbarats 260-360 km southwest of Ville-Marie imply relative rotation of ~30° or more about a vertical axis within the Southern Province since the Penokean Orogeny. The results suggest that the hematitic breccia and the Ville-Marie paleosol formed at a paleolatitude of /1.2°+/-3.4°, in accord with our earlier inference of equatorial paleolatitudes for the Lorrain and Gowganda formations and Huronian glaciation. Paleomagnetic data from several continents suggest that ferruginous weathering horizons formed over a wide range of paleolatitudes in the Proterozoic.

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