Submarine glacial-landform distribution across the West Greenland margin: a fjord–shelf–slope transect through the Uummannaq system (70–71° N)

2016 ◽  
Vol 46 (1) ◽  
pp. 453-460 ◽  
Author(s):  
J. A. Dowdeswell ◽  
K. A. Hogan ◽  
C. Ó Cofaigh
Keyword(s):  
The West ◽  
West Greenland ◽  
Shelf Slope ◽  
Glacial Landform ◽  
Greenland Margin

scholarly journals Biostratigraphic correlation of the western and eastern margins of the Labrador–Baffin Seaway and implications for the regional geology

2016 ◽  
Vol 37 ◽  
pp. 1-74 ◽  
Author(s):  
Henrik Nøhr-Hansen ◽  
Graham L. Williams ◽  
Robert A. Fensome
Keyword(s):  
Fungal Spores ◽  
Climatic Conditions ◽  
The West ◽  
West Greenland ◽  
Palynological Assemblages ◽  
Thermal Maximum ◽  
Biostratigraphic Correlation ◽  
Western Side ◽  
Greenland Margin ◽  
The Relationship

New analyses of the palynological assemblages in 13 offshore wells on the Canadian margin and six on the West Greenland Margin, in conjunction with onshore data, have led to a new biostratigraphic framework for the Cretaceous–Cenozoic strata of the Labrador Sea – Davis Strait – Baffin Bay (Labrador–Baffin Seaway) region and the first broad biostratigraphic correlation of the Canadian and Greenland margins. This framework is based on 167 last occurrences and 18 local/regional peak/common-occurrence events for dinocysts, miospores, fungal spores and Azolla. Detailed biostratigraphic evidence has confirmed the following hiatuses: pre-Aptian in the Hopedale Basin; pre-Albian in the Saglek Basin; Albian–Turonian in some wells of the Hopedale Basin; Turonian–Santonian/Campanian in some areas; pre-Campanian and late Campanian – Thanetian on the Greenland Margin; late Maastrichtian and Danian in some wells of the Hopedale Basin and in the Saglek Basin; Selandian in part of the Hopedale Basin, in all the Saglek Basin wells and in two wells on the West Greenland Margin; late Ypresian and/or Lutetian on both sides; Oligocene to middle Miocene of considerable variability on both margins, with all of the Oligocene and the lower Miocene missing in all the West Greenland Margin wells; and middle to late Miocene on the western side. On the Canadian margin, the hiatuses can be partially matched with the five previously recognised regional unconformities; on the Greenland margin, however, the relationship to the five unconformities is more tenuous. Palynomorph assemblages show that most Aptian to Albian sediments were deposited in generally non-marine to marginal marine settings, interrupted by a short-lived shallow marine episode in the Aptian. A marine transgression started in the Cenomanian–Turonian and led to the most open-marine, oceanic conditions in the Campanian–Lutetian; shallowing probably started in the late Lutetian and continued into the Rupelian, when inner neritic and marginal marine palaeoenvironments predominated. Throughout the rest of the Cenozoic, inner neritic palaeoenvironments alternated with marginal marine conditions on the margins of the Labrador–Baffin Seaway. These observations broadly reflect the tectonic evolution of the seaway, with rift conditions prevailing from Aptian to Danian times, followed by drift through much of the Paleocene and Eocene, and post-drift from Oligocene to the present. Dinocysts indicate that climatic conditions in the Labrador–Baffin Seaway region were relatively temperate in the Cretaceous, but varied dramatically through the Cenozoic. The Danian was a time of increasingly warmer climate, a thermal maximum being reached around the Paleocene–Eocene boundary reflecting the global thermal event at this time. Warm to hot conditions prevailed throughout the Ypresian, but the climate began to cool in the Lutetian, a trend that accelerated through the Priabonian and Rupelian. Throughout the Neogene, temperatures generally declined, culminating in the Quaternary.

Evolution of the west Greenland margin: offshore thermostratigraphic data and modelling

2012 ◽  
Vol 169 (5) ◽  
pp. 515-530 ◽  
Author(s):  
E. D. McGregor ◽  
S. B. Nielsen ◽  
R. A. Stephenson ◽  
O. R. Clausen ◽  
K. D. Petersen ◽  
...  
Keyword(s):  
The West ◽  
West Greenland ◽  
Greenland Margin

Reinterpretation of two diatom species from the West Greenland margin — Thalassiosira kushirensis and Thalassiosira antarctica var. borealis — hydrological consequences

2012 ◽  
Vol 88-89 ◽  
pp. 1-14 ◽  
Author(s):  
Diana W. Krawczyk ◽  
Andrzej Witkowski ◽  
Marcin Wroniecki ◽  
Joanna Waniek ◽  
Krzysztof J. Kurzydłowski ◽  
...  
Keyword(s):  
Diatom Species ◽  
The West ◽  
West Greenland ◽  
Greenland Margin

Distribution of dinocyst assemblages in surface sediment samples from the West Greenland margin

2020 ◽  
Vol 159 ◽  
pp. 101818 ◽  
Author(s):  
Estelle Allan ◽  
Anne de Vernal ◽  
Diana Krawczyk ◽  
Matthias Moros ◽  
Taoufik Radi ◽  
...  
Keyword(s):  
Surface Sediment ◽  
The West ◽  
Sediment Samples ◽  
West Greenland ◽  
Greenland Margin

Seismic architecture and evolution of the Disko Bay trough-mouth fan, central West Greenland margin

2016 ◽  
Vol 147 ◽  
pp. 69-90 ◽  
Author(s):  
Julia C. Hofmann ◽  
Paul C. Knutz ◽  
Tove Nielsen ◽  
Antoon Kuijpers
Keyword(s):  
West Greenland ◽  
Greenland Margin

scholarly journals Genetic mixed-stock analysis disentangles spatial and temporal variation in composition of the West Greenland Atlantic Salmon fishery

2016 ◽  
Vol 73 (9) ◽  
pp. 2311-2321 ◽  
Author(s):  
Ian R. Bradbury ◽  
Lorraine C. Hamilton ◽  
Timothy F. Sheehan ◽  
Gerald Chaput ◽  
Martha J. Robertson ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
North American ◽  
Temporal Stability ◽  
Spatial And Temporal Variation ◽  
Published Data ◽  
The West ◽  
West Greenland ◽  
Archived Samples ◽  
Mixed Stock ◽  
Salmon Fishery

Abstract The West Greenland Atlantic Salmon (Salmo salar) fishery represents the largest remaining mixed-stock fishery for Atlantic Salmon in the Northwest Atlantic and targets multi-sea-winter (MSW) salmon from throughout North America and Europe. We evaluated stock composition of salmon harvested in the waters off West Greenland (n = 5684 individuals) using genetic mixture analysis and individual assignment to inform conservation of North American populations, many of which are failing to meet management targets. Regional contributions to this fishery were estimated using 2169 individuals sampled throughout the fishery between 2011 and 2014. Of these, 22% were identified as European in origin. Major North American contributions were detected from Labrador (∼20%), the Southern Gulf/Cape Breton (29%), and the Gaspe Peninsula (29%). Minor contributions (∼5%) were detected from Newfoundland, Ungava, and Quebec regions. Region-specific catches were extrapolated using estimates of composition and fishery catch logs and harvests ranged from 300 to 600 and 2000 to 3000 individuals for minor and major constituents, respectively. To evaluate the temporal stability of the observed fishery composition, we extended the temporal coverage through the inclusion of previously published data (1995–2006, n = 3095) and data from archived scales (1968–1998, n = 420). Examination of the complete time-series (47 years) suggests relative stability in stock proportions since the late 1980s. Genetic estimates of stock composition were significantly associated with model-based estimates of returning MSW salmon (individual years r = 0.69, and overall mean r = 0.96). This work demonstrates that the analysis of both contemporary and archived samples in a mixed-stock context can disentangle levels of regional exploitation and directly inform assessment and conservation of Atlantic Salmon in the West Greenland interceptory Atlantic Salmon fishery.

scholarly journals Topographic and Glaciological Controls on Holocene Ice-Sheet Margin Dynamics. Central West Greenland

1990 ◽  
Vol 14 ◽  
pp. 307-310 ◽  
Author(s):  
C.R. Warren ◽  
N.R.J. Hulton
Keyword(s):  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Glacial Maximum ◽  
Warm Climate ◽  
Short Term ◽  
The West ◽  
West Greenland ◽  
The Past

The retreat of the West Greenland ice sheet from its Sisimiut (Wisconsinan) glacial maximum, was punctuated by a series of Stillstands or small readvances that formed numerous moraines. These landforms have been interpreted in the past as the result of short-term, regional falls in ablation-season temperatures. However, mapping of the geomorphological evidence south of Ilulissat (Jakobshavn) suggests that retreat behaviour was not primarily governed by climate, and therefore that the former ice margins are not palaeoclimatically significant. During warm climate ice-sheet wastage, the successive quasi-stable positions adopted by the ice margin were largely governed by topography. The retreat of the inherently unstable calving glaciers was arrested only at topographically-determined locations where stability could be achieved.

Sign in / Sign up

Export Citation Format

Share Document