Magnetic anomalies and rock magnetism of basalts from Reykjanes (SW-Iceland) |
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| Authors: | Frank Dietze Agnes Kontny Ingo Heyde Carsten Vahle |
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| Institution: | 1.Institut für Angewandte Geowissenschaften,Karlsruher Institut für Technologie (KIT),Karlsruhe,Germany;2.Bundesanstalt für Geowissenschaften und Rohstoffe,Hannover,Germany;3.Eriksfiord AS, Kunnskapsparken,Stavanger,Norway |
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| Abstract: | This study presents rock magnetic properties along with magnetic field measurements of different stratigraphic and lithologic
basalt units from Reykjanes, the southwestern promontory of the Reykjanes peninsula, where the submarine Reykjanes Ridge passes
over into the rift zone of southwestern Iceland. The basaltic fissure eruptions and shield lava of tholeiitic composition
(less than 11500 a old) show a high natural remanent magnetization (NRM, Jr) up to 33.6 A/m and high Koenigsberger ratio (Q) up to 52.2 indicating a clear dominance of the NRM compared to the induced
part of the magnetization. Pillow basalts and picritic shield lava show distinctly lower Jr values below 10 A/m. Magnetic susceptibility (κ) ranges for all lithologies from 2.5 to 26×10−3 SI. |
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