Magnetic surveys of Iceland

Jónsson, Geirfinnur; Kristjánsson, Leó; Sverrisson, Marteinn

doi:10.1016/0040-1951(91)90499-i

Cited by 37 publications

(25 citation statements)

References 19 publications

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“…The sources of most of the short-wavelength anomalies dominating the magnetic field are essentially at the base of the ice and are interpreted to be caused mostly by late Cenozoic subvolcanic intrusions and some thick flows which we term ''volcanic centers'' as discussed by Behrendt and Wold (1963), Behrendt, 1964, Behrendt et al (1991a,b, 1994, 2002a and Jankowski et al (1983). Jonsson et al (1991) showed and discussed the magnetic anomaly map of Iceland, which is entirely a volcanic terrane; the similarity of this map and other aeromagnetic surveys over volcanic terranes to Fig. 2 (this paper) is striking.…”

Section: Aeromagnetic and Radar Ice Sounding Surveysupporting

confidence: 52%

Shallow-source aeromagnetic anomalies observed over the West Antarctic Ice Sheet compared with coincident bed topography from radar ice sounding—new evidence for glacial “removal” of subglacially erupted late Cenozoic rift-related volcanic edifices

Behrendt

Blankenship

Morse

et al. 2004

Global and Planetary Change

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Section: Aeromagnetic and Radar Ice Sounding Surveysupporting

confidence: 52%

Shallow-source aeromagnetic anomalies observed over the West Antarctic Ice Sheet compared with coincident bed topography from radar ice sounding—new evidence for glacial “removal” of subglacially erupted late Cenozoic rift-related volcanic edifices

Behrendt

Blankenship

Morse

et al. 2004

Global and Planetary Change

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“…However, the possibility remains that anomalies of still larger dimensions as seen in aeromagnetic surveys of Iceland (e.g. Jonsson et al, 1991) may have influenced the remanence directions in lavas. Notes: n is the number of core samples per unit; one specimen was measured from each sample.…”

Section: Effects Of Local Anomaliesmentioning

confidence: 95%

Paleomagnetism and magnetic anomalies in Iceland

Kristjánsson

Jónsson

2007

Journal of Geodynamics

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“…Aeromagnetic surveys over Iceland (see Jónsson et al, 1991) revealed a large number of distinctly localized magnetic anomalies, which comprises (1) broad lineations subparallel to the currently active or extinct spreading zones and (2) localized anomalies at individual volcanic centers.…”

Section: Introductionmentioning

confidence: 99%

Magnetic anomalies and rock magnetism of basalts from Reykjanes (SW-Iceland)

et al. 2011

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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, J r ) 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 J r values below 10 A/m. Magnetic susceptibility () ranges for all lithologies from 2.5 to 26  10 3 SI. Heterogeneously distributed titanomagnetite with small grain sizes is the main carrier of magnetization. Magnetic susceptibility vs. temperature -T) curves reveal multiple Curie temperatures from 35 to 570C suggesting different Ti-concentrations in titanomagnetite. A minor oxidation to titanomaghemite is indicated by the irreversibility of some of the -T curves. 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.The total geomagnetic field was measured for regional field variations along three profiles normal to the spreading zone at Reykjanes. These measurements along with the rock magnetic data and field observations were used for modeling the geological subsurface. 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. Furthermore, topographic features like fault scarps, pillow basalt -hyaloclastite ridges and shield lava are considered.

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Magnetic surveys of Iceland

Cited by 37 publications

References 19 publications

Shallow-source aeromagnetic anomalies observed over the West Antarctic Ice Sheet compared with coincident bed topography from radar ice sounding—new evidence for glacial “removal” of subglacially erupted late Cenozoic rift-related volcanic edifices

Shallow-source aeromagnetic anomalies observed over the West Antarctic Ice Sheet compared with coincident bed topography from radar ice sounding—new evidence for glacial “removal” of subglacially erupted late Cenozoic rift-related volcanic edifices

Paleomagnetism and magnetic anomalies in Iceland

Magnetic anomalies and rock magnetism of basalts from Reykjanes (SW-Iceland)

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