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Early Cretaceous paleolatitude of the Yukon-Koyukuk province, Alaska

Journal of Geophysical Research

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Abstract

Although Lower Cretaceous volcanogenic rocks of the Yukon-Koyukuk province preserve primary remanent magnetizations, the primary component is masked by a pervasive overprint. The overprinting magnetization which has dual polarity, was acquired after a Late Cretaceous orogeny left the region highly deformed. The primary magnetization corresponds to a mean paleopole of Early Cretaceous age at 60.2??N. 159??E. The mean paleolatitude is 69??N with the 95% confidence ellipse ranging from 60?? to 75??N. We infer that Lower Cretaceous rocks of the Brooks Range and the Yukon-Koyukuk province were once separated by a wide ocean basin that was closed by subduction, probably during the Cretaceous. The northern limb of the Angayucham terrane, which lies between the Brooks Range and the Yukon-Koyukuk province, may contain remnants of the now-closed ocean basin. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Early Cretaceous paleolatitude of the Yukon-Koyukuk province, Alaska
Series title:
Journal of Geophysical Research
Volume
93
Issue:
B10
Year Published:
1988
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article