Magnetic Data on the Structure of the Central Arctic Region

King, Elizabeth R.; Zietz, Isidore; Alldredge, Leroy R.

doi:10.1130/0016-7606(1966)77[619:mdotso]2.0.co;2

Cited by 46 publications

(10 citation statements)

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“…The present high-level magnetic data confirm the irregular amplitudes and wavelengths found by King et al (1966) near the continental shelf, but cannot conclusively resolve lineations due to sea-floor spreading which might be present. Near the continent, lineations resulting from seafloor spreading might become grossly distorted as a result of interactions between the different tectonic environments of oceanic and continental crust.…”

Section: Region Vsupporting

confidence: 52%

“…Vogt andOstenso (1970) andHa11 (1971) have proposed the Alpha Ridge as an extinct site of sea-floor spreading; King et al (1966) suggested that the ridge is a sunken continental block; and Herron et al (1974) proposed that the ridge has been a site of plate subduction.…”

Section: Region Vmentioning

confidence: 98%

“…Reference was made to other magnetic data in some parts of the area (G.S.C. 1971; Ostenso and Wold 1970;King et al 1966;Sask. Dep.…”

Section: Construction Of the Mapmentioning

confidence: 99%

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Large scale magnetic anomalies over western Canada and the Arctic: a discussion

Coles¹,

Haines²,

Hannaford³

1976

Can. J. Earth Sci.

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A conroured map of vertical magnetic held residuajs (relative to the IGRF) over western Canada and adjacent Arctic regions has been produced by amalgamating new data with those from previous surveys. The measurements were made at altitudes between 3.5 and 5.5 km above sea level. The map shows the form of the magnetic field within the waveband 30 lo 5000 km. A magnetic feature of several thousand LiIomerres wavelength dominates the map. and is probably due in major part to sources in the earth's core. Superimposed on t h i~ are several groups of anomalies which contain wavelengths of the order of a thousand kilometres. The patterns of the rhort wavelen@h anomalies provide a broad view of major structures and indicate several regimes of di~tinctive evolutionary development. Enhancement of viscous magnetization at elevated temperatures may account for the concentration of in~enqe anomalies observed near the western edge of the craton.Une carte de contours residuels du champ magnetique vertical (par rapport au IGRF) du Canada de I'ouest et les regions contigues de I'Arctique a ete fabriquee par I'amalgamation des nouvelles donnees avec celles des leves anterieurs. Les mesures ont t t e faites a des altitudes entre 3.5 et 5.5 km au-dessus du niveau de la mer. La carte montre la forme du champ magnetique pourles longueurs d'onde de 30 b 5000 km. Une anomalie magndtique avec les longueurs d'onde de plusieurs milk kitomitres domine la carte, et probablement est due. en grande partie. i des sources dans le nayau terrestre. Rusieurs groupes d'anomalies de longueur d'onde de I'ordre de rnille kilornttres sont superposis sur I'anomalic dominante. LRs motifs des anomalies des longueurs d'onde courtes donnent une vue d'ensemhle des sauctures rnajeures e t indiquent quclqu~s rkgirnes de diveloppemenl ivolutiannaire distinctif, L'augmentation du mapnetisme visqueux i des ternpkralures Clevies peut expliquer les anomalies prononckes qu'on a observe pres du bord ouest du craton.

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Section: Region Vsupporting

confidence: 52%

Section: Region Vmentioning

confidence: 98%

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Large scale magnetic anomalies over western Canada and the Arctic: a discussion

Coles¹,

Haines²,

Hannaford³

1976

Can. J. Earth Sci.

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“…The Alpha ridge has been variously interpreted as a subduction zone (Herron et al 1974), as an extinct center of sea-floor spreading (Churkin 1973;Vogt and Ostenso 1970;Hall 1973;Tailleur 1973;Vogt and Avery 1974), or as subsided continental crust (Eardley 1961;King et al 1966;Taylor 1978). DeLaurier (1978) rejects the hypotheses of a subduction zone or a center of sea-floor spreading on the basis of a comparison of the measured relief with the relief expected from a cooling model, because of a lack of seismic activity, and because active accretion is inconsistent with the known Can.…”

Section: Fig 7 Reduction Of Pogo Anomaly Map To An Altitude Of 500 mentioning

confidence: 99%

“…With the publication of the paper by Regan et al In recent years it has been realized that crustal magnetic anomalies exist which are of longer wavelengths than those investigated by exploration geophysicists and that these longer wavelength (greater than 50 km) anomalies are indicative of geologic and tectonic features in the deep crust (Pakiser and Zietz 1965;Zietz et al 1966;Shuey et al 1973;Hall 1974;Krutikhovskaya and Pashkevich 1977). 'Contribution from the Earth Physics Branch No.…”

Section: Introductionmentioning

confidence: 99%

Comparisons of magnetic anomalies of lithospheric origin measured by satellite and airborne magnetometers over western Canada

Langel

Coles²,

Mayhew

1980

Can. J. Earth Sci.

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Crustal magnetic anomaly data from the Orbiting Geophysical Observatories 2,4, and 6 (Pogo) satellites are compared with upward-continued aeromagnetic data between 59-85"N latitude and 220-260"E longitude. Agreement is good, both in anomaly location and in amplitude, giving confidence that it is possible to proceed with the derivation and interpretation of satellite anomaly maps in all parts of the globe. The data contain a magnetic high over the Alpha ridge suggesting continental composition and a magnetic low over the southern Canada basin and northern Canadian Arctic Islands (Sverdrup basin). The low in the Sverdrup basin corresponds to a region of high heat flow, suggesting a shallow Curie isotherm. A ridge of high field, with two distinct peaks in amplitude, is found over the northern portion of the platform deposits and a relative high is located in the central portion of the Churchill Province. No features are present to indicate a magnetic boundary between Slave and Bear Provinces, but a trend change is evident between Slave and Churchill Provinces. South of 60" latitude a broad magnetic low is located over very thick (40-50 km) crust, interpreted to be a region of low magnetization.On compare les donnees recueillies par les satellites OGO 2, 4 et 6 (Pogo) sur les anomalies magnetiques dans la crofite avec un prolongement vers le haut des donnees atromagnetiques situees entre les latitudes 50-85"N et les longitudes 220-26O0E. L'accord est bon a lafois pour la localisation des anomalies et leur amplitude, ce qui permet d'itre optimiste quant a la possibilite de proceder a la confection et a I'interpretation de cartes d'anomalies magnetiques par satellite dans toutes les parties du globe. Les donnees contiennent un pic magnetique sur la crkte Alpha suggerant une composition continentale et une depression magnetique sur le bassin du sud du Canadaet dans les iles de 1'Arctique canadien au nord (le bassin de Sverdrup). Ladepression dans le bassin de Sverdrup correspond a une region de flux thermique eleve ce qui laisse supposer une isotherme de Curie afaible profondeur. Une crite de champ intense avec deux pics distincts dans I'amplitude se retrouve dans la partie nord des depBts de plate-forme et un sommet relatif est localise dans la portion centrale de la province de Churchill. I1 n'y a rien qui indique une limite magnetique entre les provinces de 1'Esclave et de I'Ours, il y a un changement evident entre les provinces de Churchill et de I'Esclave. Au sud de la latitude 60°N, on observe une vaste depression magnetique situee sur une croDte tres epaisse (40-50 km) et qu'on interprkte comme une region de faible aimantation.

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The North American Plate from the Arctic Archipelago to the Romanzof Mountains

Norris

Yorath

1981

The Arctic Ocean

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Magnetic Data on the Structure of the Central Arctic Region

Cited by 46 publications

References 0 publications

Large scale magnetic anomalies over western Canada and the Arctic: a discussion

Large scale magnetic anomalies over western Canada and the Arctic: a discussion

Comparisons of magnetic anomalies of lithospheric origin measured by satellite and airborne magnetometers over western Canada

The North American Plate from the Arctic Archipelago to the Romanzof Mountains

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