Palaeomagnetic excursions recorded in mid-Weichselian cave sediments from Skjonghelleren, Valderøy, W. Norway

doi:10.1016/0031-9201(87)90041-0

Physics of the Earth and Planetary Interiors

Volume 45, Issue 4, May 1987, Pages 337-348

https://doi.org/10.1016/0031-9201(87)90041-0 Get rights and content

Abstract

Anomalous single component palaeomagnetic directions in laminated clay-silt sediments in the non-karstic Skjonghelleren cave, W. Norway, are interpreted to record two high-resolution, but incomplete records of geomagnetic field excursions. A depositional, non-distorted origin of magnetization, carried by ultra-fine magnetite/maghemite grains, has been inferred from field evidence, redeposition experiments and magnetic fabric properties. The sediments deposited sub-glacially between 56 ka to 12 ka, determined by consistent isotope ages obtained from bones and travertine. The youngest excursion (< 30 ka), defined by two equatorial anticlockwise VGP loops, are readily correlated with one of the synchrone Lake Mungo VGP positions, suggesting a phase of global instability of the geomagnetic field. Meridionally constrained, low-latitudinal VGP paths for the oldest excursion (< 56 ka), have features consistent with transitional field geometries, suggesting an aborted reversal origin of this event.

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Palaeomagnetic excursions recorded in mid-Weichselian cave sediments from Skjonghelleren, Valderøy, W. Norway

Abstract

Earth Planet. Sci. Lett.

Earth Planet. Sci. Lett.

Earth Planet. Sci. Lett.

Earth Planet. Sci. Lett.

Phys. Earth Planet. Inter.

Earth Planet. Sci. Lett.

Earth Planet. Sci. Lett.

Geomagnetic variations in Older (23000 B.P.) and Younger Yoldia clay (≈ 14000 B.P.) at Nørre Lyngby, Denmark

Geophys. J. R. Astron. Soc.

The Lake Mungo geomagnetic excursion

Philos. Trans. R. Soc. London

Effect of compaction on the acquisition of a detrital remanent magnetization in fine-grained sediments

Geophys. J. R. Astron. Soc.

Palaeomagnetic dating of cave paintings in the Tito Bustillo Cave, Asturia, Spain

Science

Secular oscillations of the geomagnetic field recorded by sediments deposited in caves in the Mediterranean region

Geophys. J. R. Astron. Soc.

Relationship between median destructive field and remanent acquisition coercive forces for dispersed natural magnetite, titanomagnetite and hematite

Geophys. J. R. Astron. Soc.

The Late Pleistocene geomagnetic field as recorded by sediments from Fargher Lake, Washington, U.S.A.

Earth Planet. Sci. Lett.

Dispersion on a sphere

The magnitude of the palaeomagnetic field: a new non-thermal, non-detrital method using Sundried bricks

Geophys. J.R. Astron. Soc.