Magnetic Data Confirm That the Nansen - Amundsen Basin Is of Normal Oceanic Type

Demenitskaya, R. M.; Karasik, Avner

doi:10.4095/103419

Cited by 3 publications

(1 citation statement)

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“…It has been proposed that the Lomonosov ridge is a fragment of' the Siberian continental shelf that was rafted across the Eurasian basin as a result of a rift along the Siberian continental shelf [Wilson, 1963]. This hypothesis is supported by the discovery of magnetic lineations on either side of and parallel to the mid-Arctic ridge (Nansen cordillera), which bisects the Eurasian basin [Demenitskaya and Karask, 1966]. Furthermore, the Lomonosov ridge area is aseismic [Sykes, 1965] and is therefore not a tectonically active structure.…”

Section: Geophysical Implicationsmentioning

confidence: 99%

Plumb line deflection near the North Pole

Lillestrand¹,

Weber²

1974

J. Geophys. Res.

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In April 1969 the deflection of the plumb line in the vicinity of the Lomonosov ridge near the north pole was determined from a drifting ice station by measuring the displacement between two drift paths, one determined astronomically and the other determined by means of a Transit Satellite receiver. In addition, the fine structure of the drift path relative to the ocean floor was obtained from acoustic measurements. The mean plumb line deflection at 89ø40'N, 77øW was found to be 9 arc sec in the direction of 34øE, pointing away from the Lomonosov ridge. Computations were made concerning the perturbation of the gravity vector on the basis of a hypothetical model of the Lomonosov ridge. This model involves a density structure consistent with a continental origin of the ridge and shows that deflection gradients of up to 0.7 arc sec/km and horizontal gravity gradients of up to 3.4 mGal/km can occur. The measured plumb line deflection and gravity observations carried out in the vicinity of the ridge are consistent with the model, but because of the scarcity of observations and the very incomplete bathymetric data, no final conclusions on the origin of the Lomonosov ridge can be made. Continuous plumb line deflection measurements are ideally suited to be carried out from a drifting sea ice station where they will complement the gravity measurements in an area where regional gravity observations are scarce.

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Section: Geophysical Implicationsmentioning

confidence: 99%