The Early Carboniferous Mageroy dykes, northern Norway: palaeomagnetism and palaeogeography

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The Early Carboniferous Mageroy dykes, northern Norway: palaeomagnetism and palaeogeography. / Roberts, RJ; Torsvik, TH; Andersen, TB; Rehnström, Emma.

In: Geological Magazine, Vol. 140, No. 4, 2003, p. 443-451.

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Roberts, RJ ; Torsvik, TH ; Andersen, TB ; Rehnström, Emma. / The Early Carboniferous Mageroy dykes, northern Norway: palaeomagnetism and palaeogeography. In: Geological Magazine. 2003 ; Vol. 140, No. 4. pp. 443-451.

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TY - JOUR

T1 - The Early Carboniferous Mageroy dykes, northern Norway: palaeomagnetism and palaeogeography

AU - Roberts, RJ

AU - Torsvik, TH

AU - Andersen, TB

AU - Rehnström, Emma

PY - 2003

Y1 - 2003

N2 - Palaeomagnetic data from the 337 Ma Mageroy dykes (northern Norway) are of exceptionally high quality, and a positive contact test along with an existing regional result from the Silurian Honningsvag Igneous Suite attests to a primary Early Carboniferous magnetic signature. The palaeomagnetic pole (S 14.8degrees, E320.1degrees, dp/dm = 4.4/8.6degrees) is the first Early Carboniferous pole from Baltica, and implies that northernmost Norway-Greenland, the Barents Sea and Svalbard were located at tropical to low northerly latitudes at this time. Northward drift during Carboniferous times (5-6 cm/yr) as demonstrated from palaeomagnetic data is also reflected in the sedimentary facies in the Barents Sea realm, that is, a change from tropical (Early Carboniferous) to subtropical (20-30degrees N) carbonates and evaporites in the Late Carboniferous. The Mageroy dykes are continental tholeiites which intruded into a set of NW-SE-trending normal faults parallel to the Trollfjorden-Komagelva Fault Zone and the Mageroysundet Fault immediately to the north and south of Mageroya, respectively. These, and many other NW-SE-trending faults (onshore and offshore), were active during Late Palaeozoic extension, and the dykes were probably contemporaneous with the earliest syn-rift sedimentation in the Barents Sea (for example, the Nordkapp Basin).

AB - Palaeomagnetic data from the 337 Ma Mageroy dykes (northern Norway) are of exceptionally high quality, and a positive contact test along with an existing regional result from the Silurian Honningsvag Igneous Suite attests to a primary Early Carboniferous magnetic signature. The palaeomagnetic pole (S 14.8degrees, E320.1degrees, dp/dm = 4.4/8.6degrees) is the first Early Carboniferous pole from Baltica, and implies that northernmost Norway-Greenland, the Barents Sea and Svalbard were located at tropical to low northerly latitudes at this time. Northward drift during Carboniferous times (5-6 cm/yr) as demonstrated from palaeomagnetic data is also reflected in the sedimentary facies in the Barents Sea realm, that is, a change from tropical (Early Carboniferous) to subtropical (20-30degrees N) carbonates and evaporites in the Late Carboniferous. The Mageroy dykes are continental tholeiites which intruded into a set of NW-SE-trending normal faults parallel to the Trollfjorden-Komagelva Fault Zone and the Mageroysundet Fault immediately to the north and south of Mageroya, respectively. These, and many other NW-SE-trending faults (onshore and offshore), were active during Late Palaeozoic extension, and the dykes were probably contemporaneous with the earliest syn-rift sedimentation in the Barents Sea (for example, the Nordkapp Basin).

KW - palaeogeography

KW - Carboniferous

KW - Norway

KW - palaeomagnetism

U2 - 10.1017/S0016756803008082

DO - 10.1017/S0016756803008082

M3 - Article

VL - 140

SP - 443

EP - 451

JO - Geological Magazine

JF - Geological Magazine

SN - 0016-7568

IS - 4

ER -