Other
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002e%26psl.203..983y&link_type=abstract
Earth and Planetary Science Letters, Volume 203, Issue 3-4, p. 983-998.
Other
15
Scientific paper
We report geomagnetic field intensities for the A (~1000 Ma) and B (~850 Ma) natural remanent magnetizations of the Cordova Gabbro of southern Ontario. We interpret A and B to be secondary thermal overprints produced during regional uplift and cooling following the Grenvillian Orogeny. Multivectorial A+B paleointensity data were analyzed using pairs of Arai diagrams for the separated A and B vectors. From 18 reliable A results and 15 reliable B results, we find paleofield values of 18.1+/-2.1 μT and 7.1+/-1.5 μT, respectively. The corresponding virtual axial dipole moments (VADMs) are (3.12+/-0.36) and (1.82+/-0.38)×1022 A m2, about 70% and 40% of the average Phanerozoic dipole moment based on data from 0.3-300 Ma. The Cordova data and other Precambrian paleointensities are generally within a range of approximately 0.5-1.5 times the Phanerozoic mean VADM. Three sets of paleofield values as a function of paleolatitude, including the Cordova data, support a dipole configuration for the Earth's field in 25-150 Ma time windows around 2700 Ma, 1100 Ma, and 850 Ma.
Dunlop David J.
Yu Yongjae
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