Plumb line deflection near the North Pole

Lillestrand, R. L.; Weber, J.

doi:10.1029/jb079i023p03347

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…The first depth soundings and gravity measurements in the vicinity of the Lomonosov Ridge near the north pole were made during the First (1967) and Second (1969) Canadian North Pole Expeditions [Lillestrand and Weber, 1974;Weber, 1983]. Their drift track and the drift tracks of the LOREX main and two satellite camps are shown in Figure 2.…”

Section: Bathymetry and Morphologymentioning

confidence: 99%

Reinterpretation of morphology and crustal structure in the Central Arctic Ocean Basin

Weber¹,

Sweeney²

1985

J. Geophys. Res.

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Ice station bathymetric profiles and submarine echograms reveal a steep escarpment at least 200 km long with up to 1700 m of relief subparallel to the Lomonosov Ridge. This feature, formerly called the Marvin Spur, is here interpreted as the Makarov‐facing flank of the Alpha Ridge. East of the 160°W meridian the intervening Makarov Basin is a narrow grabenlike trough between 25 and 60 km wide filled with horizontally stratified sediments that were deposited largely after the Marvin Seamounts were constructed along the basin axis. The association of basement relief with geomagnetic field variations within the trough plus evidence of normal faulting on the Lomonosov Ridge suggest that this segment of the Makarov Basin is an extensional feature produced by other than typical seafloor‐spreading processes. Gravity models indicate that the crust below the Makarov flank of the Alpha Ridge ranges in thickness between 16 and 20 km, considerably less than the 26 km known from seismic refraction work to exist below the Lomonosov Ridge. It is argued, on the basis of gravity data, that adjacent to the Lomonosov Ridge the Fram Basin crust, which is probably truly oceanic, is 3–4 km thinner than that of the Makarov Basin.

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Section: Bathymetry and Morphologymentioning

confidence: 99%

Reinterpretation of morphology and crustal structure in the Central Arctic Ocean Basin

Weber¹,

Sweeney²

1985

J. Geophys. Res.

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“…The gravity observations obtained during these two expedi tions provided a basis for compiling a preliminary struc tural model of the Lomonosov Ridge [Lillestrand and Weber, 1974]. The prime objective of these surveys was to establish a line of gravity stations from Alert on Ellesmere Island to the Pole and to obtain as many gravity observations as possible in the vicinity of the Pole and across the Lomonosov Ridge.…”

Section: Introductionmentioning

confidence: 99%

The Lomonosov Ridge experiment: 'Lorex 79'

Weber¹

1989

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In the spring of 1979 the Department of Energy, Mines and Resources (EMR) undertook a large‐scale, multidisciplinary project to study the nature and origin of the Lomonosov Ridge. The scientific program was planned and coordinated by the Earth Physics Branch, and the logistic support was provided by the Polar Continental Shelf Project/Scientists from other branches of EMR, from the Department of Fisheries and Oceans (DFO), and from a number of universities in Canada and the U.S.A. took part in the project code named Lorex 79. The Lomonosov Ridge is an aseismic submarine mountain range that bisects the Arctic Ocean into the Amerasia and Eurasia Basins (Figure 1). It rises sharply to a height of some 3 km above the adjacent abyssal plains, the Makarov Basin to the west, and the Fram Basin to the east. It is close to 200 km wide where it approaches the North American and Eurasian continental shelves but narrows to 25 km at its midpoint near the North Pole. Its relatively flat top, the steepness of its flanks, and results from previous geophysical measurements indicate that it may be a sedimentary structure of continental origin rather than a structure of oceanic origin [Sweeney et al., 1978]. In this context it has been suggested on several occasions that it is a rafted fragment split off the Eurasian continental shelf at the time of the opening of the North Atlantic and the Eurasia Basin in Early Tertiary times. However, since the available geophysical, geological, and bathymetric data are relatively sparse and often of doubtful quality (because of the enormously difficult operating conditions), the continental nature of the Lomonosov Ridge has never been unambiguously demonstrated.

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“…The need for accurate positioning for these observations resulted in the development of new techniques for obtaining astro and satellite fixes from a moving platform in the immediate polar region and included, for the first time, the use of an acoustic bottom reference system for determining the fine struc ture of the ice drift in relation to the ocean floor. The gravity observations obtained during these two expedi tions provided a basis for compiling a preliminary struc tural model of the Lomonosov Ridge [Lillestrand and Weber, 1974].…”

Section: Introductionmentioning

confidence: 99%

The Lomonosov Ridge experiment: 'Lorex 79'

Weber¹

1979

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Plumb line deflection near the North Pole

Cited by 9 publications

References 3 publications

Reinterpretation of morphology and crustal structure in the Central Arctic Ocean Basin

Reinterpretation of morphology and crustal structure in the Central Arctic Ocean Basin

The Lomonosov Ridge experiment: 'Lorex 79'

The Lomonosov Ridge experiment: 'Lorex 79'

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