scholarly journals Upper Cretaceous diatom biostratigraphy of the Arctic Archipelago and northern continental margin, Canada

2002 ◽  
Vol 48 (4) ◽  
pp. 303-342 ◽  
Author(s):  
P. M. Tapia
Keyword(s):  
Continental Margin ◽  
Upper Cretaceous ◽  
The Arctic

scholarly journals Characteristics of Altimetry Signatures Over Sea Ice (Abstract)

1987 ◽  
Vol 9 ◽  
pp. 240
Author(s):  
N.F. McIntyre ◽  
S.W. Laxon
Keyword(s):  
Sea Ice ◽  
Continental Margin ◽  
Small Proportion ◽  
The Arctic ◽  
Antarctic Sea Ice ◽  
Surface Measurements ◽  
Characteristic Sequences ◽  
Data Coverage ◽  
Ice Edge

We report characteristics of Seasat altimetry signatures recorded over Antarctic sea ice. Up to four discrete zones can at times be seen in characteristic sequences in the Weddell and Ross Seas, and elsewhere. They are substantially larger than those reported in the Arctic, covering up to 2500 km at the time of maximum ice extent in 1978. Transitions between them can be abrupt, with marked changes occurring in less than a few kilometres. Some zones were found to persist through the 3 month satellite lifetime; others exhibited intermittent variations. Repeat data coverage has enabled temporal as well as spatial patterns to be investigated. Interpretation of the geophysical cause of the patterns observed has been limited by available data. Some comparisons may be made with surface measurements of nadir back-scatter on first- and multi-year floes but these account for only a small proportion of the altimetry returns studied. Correlations with the NOAA Navy Ice Charts show significant disparities in the determination of the ice edge which may relate to the sensitivity of the altimeter to the presence of fresh ice or ice in very small quantities. Similar signatures can be found next to small coastal leads at the continental margin, an area known to be important for the growth of new ice.

Upper Cretaceous Marine Strata on Somerset Island, N.W.T.

1973 ◽  
Vol 10 (8) ◽  
pp. 1337-1339 ◽  
Author(s):  
James Dixon ◽  
William S. Hopkins Jr. ◽  
Owen A. Dixon
Keyword(s):  
Upper Cretaceous ◽  
The Arctic ◽  
Marine Strata ◽  
Marine Shale ◽  
Somerset Island

Upper Cretaceous marine shale and limestone beds are present in a faulted outlier in the vicinity of Creswell Bay, Somerset Island. The contained microflora indicates a Senonian age and the strata are correlated to the Kanguk Formation of the Arctic islands.

Gravity and Deep Structure of the Continental Margin of Banks Island and Mackenzie Delta

1975 ◽  
Vol 12 (3) ◽  
pp. 378-394 ◽  
Author(s):  
L. W. Sobczak
Keyword(s):  
Continental Margin ◽  
Coastal Plain ◽  
Deep Structure ◽  
Gravity Anomalies ◽  
Sedimentary Basins ◽  
Drill Hole ◽  
The Arctic ◽  
Mackenzie Delta ◽  
Arctic Coastal Plain ◽  
Free Air Gravity

Regional and deep structure supported by drill hole, gravity, and seismic evidence is interpreted along five profiles—one across the Mackenzie Delta and four across the continental margin. Isostatic compensation has reduced the gravity effect of most structures but gravity anomalies are still sufficient to outline two major sedimentary basins—one very extensive and thick (>10 km) underlying the continental margin and Mackenzie Delta and the other narrow and shallow east and southeast of the Arctic Coastal Plain. A basement ridge separating these basins along the eastern side of the Arctic Coastal Plain is outlined by a trend of relative gravity highs.An arcuate belt of prominent elliptically-shaped free air gravity highs (peak values >100 mgal) over the continental break outlines an uncompensated region of mass excesses. These mass excesses are explained by pro-grading wedges (>2 km thick) of Quaternary and possibly Tertiary sediments that have displaced seawater and act as a load on the crust rather than by the alternative concepts of an uncompensated ridge or high density material in the basement.

The Lomonosov Ridge as a natural extension of the Eurasian continental margin into the Arctic Basin

2012 ◽  
Vol 53 (12) ◽  
pp. 1276-1290 ◽  
Author(s):  
V.A. Poselov ◽  
G.P. Avetisov ◽  
V.V. Butsenko ◽  
S.M. Zholondz ◽  
V.D. Kaminsky ◽  
...  
Keyword(s):  
Continental Margin ◽  
Natural Extension ◽  
Arctic Basin ◽  
The Arctic ◽  
Lomonosov Ridge
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