Arrows: heating and cooling runs T C-Curie-temperatures.ĭashed line in a): median destructive field (see Table 2) light grey curve in b), c), d): magnetic susceptibility value measured after each heating step. Rock magnetic properties of basalt lithologies from Reykjanes. The models are in agreement with a feeder dyke system related to the youngest Stampahraun 4 fissure eruption in the western part and a hydrothermally active fault system in the eastern part of Reykjanes. These measurements along with the rock magnetic data and field observations were used for modeling the geological subsurface. The total geomagnetic field was measured for regional field variations along three profiles normal to the spreading zone at Reykjanes. Intra flow variation of the magnetic minerals is relatively high depending on crystallization history and resulting primary composition and amount of titanomagnetite as well as high-temperature oxidation. Heterogeneously distributed titanomagnetite with small grain sizes is the main carrier of magnetization.Ī minor oxidation to titanomaghemite is indicated by the irreversibility of some of the -T curves. ![]() ![]() Pillow basalts and picritic shield lava show distinctly lower Jr values below 10 Am. ![]()
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