Paleomagnetism of the Lower Jurassic Copper Mountain intrusions and the geotectonics of terrane I, British Columbia | Zendy

Symons D. T. A. | Zendy; Litalien C. R. | Zendy

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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.

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