Magnetostratigraphy of the Plio-Pleistocene Kap København Formation, eastern North Greenland

Details Magnetostratigraphy of the Plio-Pleistocene Kap København Formation, eastern North Greenland Magnetostratigraphy of the Plio-Pleistocene Kap København Formation, eastern North Greenland

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...44...53a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 44, Issue 1, p. 53-61.

Physics

3

Scientific paper

The newly discovered Late Cenozoic Kap København Formation in Peary Land, eastern North Greenland (82°30'N, 21°W) which consists of at least 100 m unconsolidated sands, silts and clays, deposited in marine shallow waters, covers an area of some 500 km2. The time of deposition spanned by the sequence is estimated by comparisons with typical rates of isostatic rebound in Greenland to be roughly of the order of 3 . 104 years. Abundant content of organic remains indicates a warmer climate than at present. A number of 185 oriented palaeomagnetic specimens from two parallel composite profiles indicate, after AF cleaning, that the sampled part of the formation was deposited during a period of reversed geomagnetic polarity. Combining the polarity information with information from biostratigraphy and amino-acid ratios, the most likely age of the Kap København Formation is estimated to be constrained to the older part of the Matuyama reversed polarity chron, i.e., with an age of between 1.87 Ma (pre-Olduvai) and 2.48 Ma (post-Gauss). The most reliable (least scattered) parts of the magnetic record give cleaned mean inclinations of -77° and -59°, respectively, indicating a systematic departure from the axial dipole in the near-sided sense, in contrast to most other late Tertiary palaeomagnetic results.

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