Thellier palaeointensity experiments on Faroes flood basalts: technical aspects and geomagnetic implications

Peter Riisager, Janna Riisager, Niels Abrahamsen, Regin Waagstein

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

33 Citationer (Scopus)

Abstrakt

Based on palaeomagnetic and rock magnetic results, 108 samples from 27 flows from Palaeogene flood basalts of Faroe Islands were chosen for whole-rock Thellier palaeointensity experiments. Altogether 90 samples were rejected due to either chemical alterations or typical multidomain (MD) behaviour evidenced by pTRM-tails. AF pre-treatment was used to reduce the effect of MD grains on Thellier experiments. Only five flows (18 samples) yielded acceptable palaeointensity estimates, with flow mean VDMs ranging from 3.5 to 7.4 × 1022 A m2. Modest selection criteria imposed on all published 5-160 Ma palaeointensity data left only 15 palaeomagnetic dipole moments; eight from whole-rock samples, six from submarine basaltic glass and one from single plagioclase crystals. More data are needed before the intriguing differences between results from different materials can be put into a geomagnetic context.

OriginalsprogEngelsk
Sider (fra-til)91-100
Antal sider10
TidsskriftPhysics of the Earth and Planetary Interiors
Vol/bind131
Udgave nummer2
DOI
StatusUdgivet - 30 jul. 2002

Programområde

  • Programområde 3: Energiressourcer

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