A seismic and gravity profile across the Arctic Ocean Basin

Ostenso, Ned A.; Wold, Richard J.

doi:10.1016/0040-1951(77)90036-1

Cited by 51 publications

(26 citation statements)

References 15 publications

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“…The ¢rst continuous multi-channel seismic re£ection pro¢le across the Amundsen Basin obtained by Polarstern in 1991 along a similar track enabled Jokat et al (1995) to present a seismic stratigraphic cross section of the Amundsen Basin. These observations combined with the seismic re£ection results from the Russian ice station 'North Pole 28' (NP-28) and the US ice station 'Arctic Research Laboratory Ice Station^II' (Arlis-II) in 1965 (Ostenso and Wold, 1977) …”

Section: Introductionmentioning

confidence: 94%

“…2): in the published line drawing of the data obtained by a sparker source and a single hydrophone during the drift of ice station Arlis-II (Ostenso and Wold, 1977), in the processed records from ice station NP-28 obtained with detonating caps and a geophone array on the ice, and in the multi-channel seismic records from Polarstern using a 24-l airgun array and a 300-m-long, 12-channel streamer (Fuetterer, 1992).…”

Section: A Submarine Fan In the Amundsen Basinmentioning

confidence: 99%

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A submarine fan in the Amundsen Basin, Arctic Ocean

et al. 2004

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Seismic reflection data from drifting ice stations and an icebreaker survey document the presence of a submarine fan along the east flank of the Lomonosov Ridge in the Amundsen Basin, Arctic Ocean. The fan extends from a source area at the North Greenland and Canadian Arctic continental margin to the North Pole. The fan probably developed in response to the combined effect of increased glacial sediment input during the Plio^Pleistocene and topographically confined transport of glacial debris in the deep sea passage between Lincoln Sea margin and the southern end of the Lomonosov Ridge. ß

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Section: Introductionmentioning

confidence: 94%

Section: A Submarine Fan In the Amundsen Basinmentioning

confidence: 99%

A submarine fan in the Amundsen Basin, Arctic Ocean

et al. 2004

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“…1), which is interpreted to be a fragment of continental crust that split off the Eurasian Shelf during the opening of the Eurasia Basin (e.g., Ostenso & Wold, 1977;Sweeney et al, 1982;Jokat et al, 1992). The geological history of the Eurasia Basin is well recorded by parallel aeromagnetic survey were carried out during CASE expeditions (Circum-Arctic Structural Events) of the German Federal Institute for Geosciences and Natural Resources (BGR) in cooperation with the Geological Survey of Canada (GSC) to understand the structural architecture of the North American passive continental margin.…”

Section: Introductionmentioning

confidence: 99%

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Estrada¹,

Damaske²,

Henjes‐Kunst³

et al. 2016

NJG

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The poorly studied Alpha-Mendeleev Ridge of the Amerasia Basin of the Arctic Ocean is covered by a large magnetic high and interpreted to be part of the Cretaceous High Arctic Large Igneous Province (HALIP). At the north coast of Ellesmere Island, in the Yelverton Bay area, this characteristic magnetic high overlaps the shelf and the coastal area. Results of aeromagnetic surveys, geological fieldwork, geochronological, geochemical and Sr-Nd isotope analysis were combined to study the tectonic history of this part of the Canadian Polar margin. The basement, consisting of metamorphic rocks of the Pearya Terrane, was strongly affected by HALIP-related magmatism that is responsible for characteristic positive magnetic anomaly patterns. A broad magnetic high that can be traced to the Alpha Ridge covers the shelf and coastal areas of Yelverton Bay. It is caused by a voluminous intrusion into the continental crust at a depth of ca. 6-15 km. A chain of small positive magnetic anomalies crosses Wootton Peninsula from SW to NE and then curves into a NNE-SSW trend. It follows the coastline onshore and offshore and superimposes the southern and eastern margins of the broad magnetic high. On land, the anomaly chain covers fault-bounded outcrops of the Wootton Intrusive Complex (WIC) and the Hansen Point Volcanic Complex (HPVC), indicating that the entire anomaly chain is associated with a volcanogenic sequence. Rhyodacite that forms large parts of the HPVC east and west of Yelverton Bay extruded between c. 104 and 97 Ma (LA-ICP-MS U-Pb zircon ages). It originates from a tholeiitc suite and is probably genetically related to the deep intrusion. The HPVC together with the rhyodacite has an age range of c. 104-74 Ma and includes the mildly alkaline WIC (93-92 Ma). The northern coast of Ellesmere Island shows some characteristic features of a magma-rich rifted margin indicating an extensional evolution parallel to the North American margin between the openings of the Canada Basin and the Eurasian Basin.

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“…As the spur trends out of the Siberia Plain toward Greenland it becomes strongly asymmetric and its northern (Lomonosov Ridge-facing) flank becomes a steep scarp. Ice station Arlis 11 found a steep scarp with 1650 m of relief at the north flank of the spur when it drifted north on the 150W meridian in 1964 (Ostenso and Wold, 1977). Spot soundings taken during the LOREX and CESAR expeditions along the 160"W and 125W meridian showed elevation changes of 748 m and 554 m respectively at the scarp.…”

Section: Discussionmentioning

confidence: 99%

“…The bathymetric, shallow seismic reflection and gravity measurements carried out from the ice island Arlis I1 when it drifted across the Marvin Spur, Makarov Basin and the Lomonosov Ridge during 1964 (Ostenso and Wold, 1977) were reinterpreted by Weber and Sweeney (1985) in the light of the LOREX studies, and a composite gravity-density structural model (Weber and Sweeney, 1985:Fig. 12) was compiled along profile AG-AG' (Fig.…”

Section: Gravity Field and Structurementioning

confidence: 99%

Maps of the Arctic Basin Sea Floor. Part II: Bathymetry and Gravity of the Alpha Ridge: The 1983 CESAR Expedition

Weber¹

1987

ARCTIC

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ABSTRACT. The general scarcity of geophysical data in the Arctic Ocean Basin and the lack of knowledge about the evolution of the Amerasia Basin and of the nature and origin of the Alpha Ridge led, in 1983, to the undertaking of a multidisciplinary polar expedition, code-named CESAR 83 for Canadian Expedition to Study the Alpha Ridge. The expedition was supported by the Canadian Armed Forces, first by parachuting 18 airborne engineers onto the CESAR site to build a 1.6 km long airstrip on the pack ice, and then by deploying and two months later evacuating the expedition by military Hercules aircraft. The search for a suitable site on the sea ice was facilitated by a preceding side-looking airborne radar (SLAR) reconnaissance survey of the area.One of the major CESAR accomplishments was a regional bathymetric and gravity survey over the Ellesmere Island continental shelf and eastern part of the Alpha Ridge. Using the CESAR data as well as all publicly available data collected over the past 35 years, 1 0 0 m contour interval bathymetric maps and 5 mGal contour interval gravity free-air anomaly maps were compiled. These extend from the Ellesmere Island coast to the 116'W meridian. The sea floor maps depict the Alpha Ridge as a very broad mountain complex of rugged topography with ridges and valleys trending parallel to the ridge axis. A prominent east-southeast trending valley centered along 86"N latitude between 110" and 125

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A seismic and gravity profile across the Arctic Ocean Basin

Cited by 51 publications

References 15 publications

A submarine fan in the Amundsen Basin, Arctic Ocean

A submarine fan in the Amundsen Basin, Arctic Ocean

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Maps of the Arctic Basin Sea Floor. Part II: Bathymetry and Gravity of the Alpha Ridge: The 1983 CESAR Expedition

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