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| Detailed Reference Information |
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Yu, Y. and Dunlop, D.J. (2002). Multivectorial paleointensity determination from the Cordova Gabbro, southern Ontario. Earth and Planetary Science Letters 203(3-4): 983-998. doi: 10.1016/S0012-821X(02)00900-7. |
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We report geomagnetic field intensities for the A (approximately 1000 Ma) and B (approximately 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+ or -2.1 mu T and 7.1+ or -1.5 mu T, respectively. The corresponding virtual axial dipole moments (VADMs) are (3.12+ or -0.36) and (1.82+ or -0.38)X10 (super 22) A m (super 2), 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. |
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Multivectorial Paleointensity Methodology Methodology-# Modeling |
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Keywords
absolute age, Ar/Ar, Canada, Canadian Shield, Central Metasedimentary, Belt, Cordova Gabbro, dates, demagnetization, dipole moment, Eastern, Canada, Elzevir Terrane, Grenville Province, Grenvillian Orogeny, magnetic intensity, magnetization, metagabbro, metaigneous rocks, metamorphic rocks, natural remanent magnetization, North America, Ontario, overprinting, paleomagnetism, Precambrian, remagnetization, remanent magnetization, southern Ontario, Thellier Method, 12, Stratigraphy |
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Publisher
Elsevier Science
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The Netherlands
(+31) 20 485 3757
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