Paleomagnetism of Canadian Arctic permafrost; Quaternary magnetostratigraphy of the Mackenzie Delta
- 1 February 1997
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Earth Sciences
- Vol. 34 (2) , 135-139
- https://doi.org/10.1139/e17-011
Abstract
A total of 357 samples taken from two long cores (Taglu, Kumak) drilled in the Mackenzie River delta have been investigated paleomagnetically. Remanence and susceptibility were measured in the field while the samples were still frozen. Profiles of susceptibility (5772 measurements) permit lateral correlation and imply that the average accumulation rate at Taglu was ~50% greater than that at Kumak, which lies 15 km to the southwest. Polarity reversals were found in both cores. The Matuyama–Brunhes boundary occurs at depths of 152 and 111 m at Taglu and Kumak, respectively; corresponding depths for the Gauss – Matuyama boundary are 356 and 243 m. In addition to the major chrons, we also find evidence of the Olduvai and Jaramillo subchrons. The chronology based on these data suggests that a major change in sedimentation history occurred about 1.5 Ma ago. This feasibility study thus suggests that paleomagnetism has chronological potential in permafrost environments that are currently important in frontier hydrocarbon exploration and as natural gas hydrate reservoirs.Keywords
This publication has 9 references indexed in Scilit:
- Loess magnetismReviews of Geophysics, 1995
- Revised calibration of the geomagnetic polarity timescale for the Late Cretaceous and CenozoicJournal of Geophysical Research, 1995
- Towards an orbital time scale for chinese loess depositsQuaternary Science Reviews, 1994
- Magnetic susceptibility of Chinese loess and its bearing on paleoclimateGeophysical Research Letters, 1990
- Paleoclimatic forcing of magnetic susceptibility variations in Alaskan loess during the late QuaternaryGeology, 1990
- Evidence for a new geomagnetic reversal from Lava flows in Idaho: Discussion of short polarity reversals in the Brunhes and late Matuyama polarity chronsJournal of Geophysical Research, 1988
- Distribution, stratigraphy, petrochemistry, and palaeomagnetism of the late Pleistocene Old Crow tephra in Alaska and the YukonCanadian Journal of Earth Sciences, 1985
- Magnetostratigraphy, biostratigraphy and geochronology of Cretaceous–Tertiary boundary sediments, Red Deer ValleyNature, 1979
- Additional results on palaeomagnetic stratigraphy of the Koobi Fora Formation, east of Lake Turkana (Lake Rudolf), KenyaNature, 1977