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Paleomagnetism of the Lower Jurassic Copper Mountain intrusions and the geotectonics of terrane I, British Columbia
Author(s) -
Symons D. T. A.,
Litalien C. R.
Publication year - 1984
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl011i008p00685
Subject(s) - terrane , paleomagnetism , geology , clockwise , craton , outcrop , paleontology , precambrian , rotation (mathematics) , tectonics , geometry , mathematics
The 198 Ma Lower Jurassic Copper Mountain intrusions outcrop in the Quesnellia Subterrane of Terrane I in the Canadian Cordillera. Thermal demagnetization at 550 ± 10°C defines a single stable remanence component of 25.9°, 41.2° (α 95 =3.6°) in 11 reliable sites. The resulting pole position of 11.8°E, 57.3°N (δ p = 2.7°, δ m = 4.4°) is discordant for the North American craton and reflects 39 ± 6° of clockwise rotation and 9 ± 5° of northward translation. Combined with previous paleomagnetic and geologic data, a consistent model for the geotectonic evolution of Quesnellia and Terrane I emerges.