Neogene dinoflagellate cysts from Davis Strait, offshore West Greenland

2003 ◽  
Vol 20 (9) ◽  
pp. 1075-1088 ◽  
Author(s):  
Stefan Piasecki
Keyword(s):  
Dinoflagellate Cysts ◽  
West Greenland ◽  
Davis Strait

Early Tertiary basalts from the Labrador Sea floor and Davis Strait region

1989 ◽  
Vol 26 (5) ◽  
pp. 956-968 ◽  
Author(s):  
D. B. Clarke ◽  
B. I. Cameron ◽  
G. K. Muecke ◽  
J. L. Bates
Keyword(s):  
Volcanic Rocks ◽  
Labrador Sea ◽  
Baffin Island ◽  
Nd Isotope ◽  
Sea Floor ◽  
West Greenland ◽  
Depleted Mantle ◽  
Davis Strait ◽  
Isotope Systematics ◽  
Seawater Exchange

Fine- to medium-grained, phyric and aphyric basalt samples from ODP Leg 105, site 647A, in the Labrador Sea show little evidence of alteration. Chemically, these rocks are low-potassium (0.01–0.09 wt.% K2O), olivine- to quartz-normative tholeiites that compare closely with the very depleted terrestrial Paleocene volcanic rocks in the Davis Strait region of Baffin Island and West Greenland. However, differences exist in the Sr–Nd isotope systematics of the two suites; the Labrador Sea samples have ε Nd values (+9.3) indicative of a more depleted source, and are higher in 87Sr/86Sr (0.7040), relative to the Davis Strait basalts (ε Nd +2.54 to +8.97; mean 87Sr/86Sr 0.7034). The higher 87Sr/86Sr in the Labrador Sea samples may reflect seawater exchange despite no petrographic evidence for significant alteration. The Labrador Sea and early Davis Strait basalts may have been derived from a similar depleted mantle source composition; however, the later Davis Strait magmas were generated from a different mantle. None of the Baffin Island, West Greenland, or Labrador Sea samples show unequivocal geochemical evidence for contamination with continental crust.

scholarly journals Observations on the Precambrian rocks of Scandinavia and Labrador and their implications for the interpretation of the Precambrian of Greenland

1970 ◽  
Vol 28 ◽  
pp. 43-47
Author(s):  
D Bridgwater
Keyword(s):  
North Atlantic ◽  
Iron Ore ◽  
West Greenland ◽  
Precambrian Rocks ◽  
Geological Surveys ◽  
Davis Strait ◽  
Geological Information ◽  
Field Season ◽  
Field Excursion

During the summer of 1969 the writer visited two of the main North Atlantic Shield areas outside Greenland as a guest of the Geological Surveys of Sweden, Finland and Canada. The visit to Scandinavia was organised as a field excursion in conjunction with the I.U.G.S. Subcommission on Precambrian Stratigraphy meeting held in Stockholm at the beginning of June. I would like to thank Professors Rankarna, Simonen and Welin for their arrangements, and my companions during the field excursion for stimulating discussion of Precambrian problems. The visit to northern Labrador was initiated by the Geological Surveys of Greenland and Canada as part of a programme to compare the geology on each side of the Davis Strait. I would like to thank Dr F. C. Taylor whose party Dr B. F. Windley (Leicester University) and I joined in Labrador for his help in planning and carrying out this part of the programme. It is to be hoped that this was only a start to cooperative ventures between the two Surveys and that a member of the GSC staff wiII be able to join a GGU field party in West Greenland. After leaving the GSC party the writer was joined by Dr N. Westoll (Queens University, Kingston) to work further south along the Labrador coast. This was made possibIe through the kindness of Drs E. P. Wheeler and S. A. Morse who provided logistical support and considerable unpubIished information about the Nain district, and through the courtesy of Drs. S. Gandhi, P. Grimley and A. Beavan of the British Newfoundland Exploration Co. who provided transport, hospitality and geological information in the Makkovik and Seal Lake districts. Finally I would like to thank the staffs of the Iron Ore Co. of Canada and the McGiII University Sub-Arctic Station for their help in visiting the marginal rocks of the Labrador trough at SchefferviIIe. Without the active cooperation of all of these scientists the field season wouId have been much less successful.

Instant myth: the case of the west Greenland salmon

Polar Record ◽  
1975 ◽  
Vol 17 (109) ◽  
pp. 355-358 ◽  
Author(s):  
M. J. Dunbar
Keyword(s):  
Atlantic Salmon ◽  
The West ◽  
West Greenland ◽  
The Public ◽  
Davis Strait ◽  
Pelagic Fishery

It has been said that scientific truths begin as heresies and end as myths, enjoying a period of orthodox acceptance in between. It must be rare, if this is so, for a myth to be imposed upon the public as a “truth”, to be accepted immediately as such, and then to suffer excommunication as heresy. Such a case is at hand in the matter of the sea-life area of the Atlantic Salmon in Davis Strait and of the start of a new pelagic fishery.

Sediment supply on the West Greenland passive margin: redirection of a large pre-glacial drainage system

2020 ◽  
Vol 177 (6) ◽  
pp. 1149-1160
Author(s):  
Scott Jess ◽  
Alexander L. Peace ◽  
Christian Schiffer
Keyword(s):  
Drainage System ◽  
Sediment Supply ◽  
Passive Margin ◽  
Fluvial System ◽  
The West ◽  
Drainage Systems ◽  
West Greenland ◽  
Igneous Province ◽  
Davis Strait ◽  
Supplementary Material

The Mesozoic–Cenozoic separation of Greenland and North America produced the small oceanic basins of the Labrador Sea and Baffin Bay, connected via a complex transform system through the Davis Strait. During rifting and partial breakup sedimentary basins formed that record the changing regional sediment supply. The onshore and offshore stratigraphy of Central West Greenland outlines the presence of a major fluvial system that existed during the Cretaceous and was later redirected in the Early Cenozoic by the formation of the West Greenland Igneous Province. Hydrological analysis of Greenland's isostatically balanced basement topography outlines two major drainage systems that likely flowed across Greenland prior to the onset of glaciation and emptied into the Sisimiut Basin within the Davis Strait, offshore West Greenland. The course of the northern drainage system suggests that it initially flowed NW into the Cretaceous/Palaeocene Nuussuaq Basin, before being redirected SW around the West Greenland Igneous Province in the Mid-Palaeocene. Moreover, characteristics of these two drainage systems suggest they acted as a single larger fluvial system, prior to the onset of glaciation, that was likely the primary source of sediment across Central West Greenland throughout the Cretaceous and Palaeogene. This scenario provides a greater understanding of the West Greenland margin's late Cenozoic evolution, which differs from previous interpretations that hypothesize a period of considerable post-rift tectonism and uplift. This work highlights the importance of large pre-glacial drainage systems across North Atlantic passive margins and their relevance when studying post-rift stratigraphy in rifted margin settings.Supplementary material: Isostatic modelling, hydrological analysis and chi mapping is available at: https://doi.org/10.6084/m9.figshare.c.5050146

scholarly journals Jakobshavn Isbræ,West Greenland: the 2002–2003 collapse and nomination for the UNESCO World Heritage List

2004 ◽  
Vol 4 ◽  
pp. 85-88 ◽  
Author(s):  
Anker Weidick ◽  
Naja Mikkelsen ◽  
Christoph Mayer ◽  
Steffen Podlech
Keyword(s):  
World Heritage ◽  
High Rate ◽  
Unesco World Heritage ◽  
West Greenland ◽  
World Heritage List ◽  
Davis Strait ◽  
High Production ◽  
Ice Production ◽  
Inland Ice ◽  
Rate Of Movement

Jakobshavn Isbræ (also known as Sermeq Kujalleq or Ilulissat Isbræ) is situated at about 69°10′N and 50°00′W in West Greenland. This major outlet from the Inland Ice has an extremely high rate of movement (nearly 1 m/hour) and thus a high production of icebergs, which via the icefjord float westwards through Disko Bugt to Davis Strait (Fig. 1). Estimates of the iceberg production are in the range of 35 ± 10 km3 ice per year, more than 10% of the entire calf-ice production of the Inland Ice (e.g. Bauer l968; Bindschadler 1984). The icefjord into which Sermeq Kujalleq calves is Kangia, best known in glaciological literature as Jakobshavn Isfjord. Spectacular changes of the glacier were observed during 2002 and 2003 at the same time as it was nominated for inclusion in the UNESCO World Heritage List under the name ‘Ilulissat Icefjord’.

scholarly journals Palynostratigraphy of the Lower Tertiary volcanics and marine clastic sediments in the southern part of the West Greenland Basin: implications for the timing and duration of the volcanism

1992 ◽  
Vol 154 ◽  
pp. 13-31
Author(s):  
S Piasecki ◽  
L.M Larsen ◽  
A.K Pedersen ◽  
G.K Pedersen
Keyword(s):  
Volcanic Activity ◽  
Volcanic Rocks ◽  
Dinoflagellate Cysts ◽  
East Greenland ◽  
West Greenland ◽  
Second Stage ◽  
The Third ◽  
The North ◽  
Clastic Sediments ◽  
Third Stage

Volcanic rocks, forming hyaloclastites and subaqueous lava flows, were deposited intercalated with clastic sediments in a water-filled basin in West Greenland in the Early Tertiary. Three main stages of basin infilling occurred in the Disko-Nuussuaq area. The distribution of dinoflagellate cysts in the sediments shows that the basin was marine in the first stage and non-marine in the second stage of infilling. In the third stage the basin was displaced towards the south and was marginally marine. The dinoflagellate cysts form a typical mid-Paleocene assemblage which may be correlated with the calcareous nannoplankton (NP) zonation. The stratigraphically lowest investigated localities are coeval with the uppermost part of nannoplankton zone NP4, whereas the overlying localities within the marine basin (first stage) may be correlated with NP5-6. The localities from the non-marine second stage cannot be correlated with the NP zonation because they do not contain dinoflagellate cysts. Localities from the third stage are coeval with NP7-8. Younger volcanics are subaerially deposited. The total known range of the volcanics now falls within the NP3 to NP8 interval, giving a minimum duration for the main plateau-building stage of the volcanism of 4–6 million years. The subaerial basalts have previously been found to be mainly reversely magnetised, with one normally magnetised sequence which can now be stratigraphically correlated with NP4, and thereby identified as anomaly 27. The basalts in East Greenland started erupting during the NP9 zone, so that the volcanic activity in East Greenland largely succeeded that in West Greenland. In relation to the postulated mantle plume in the North Atlantic this means that the volcanic activity started in the peripheral part of the plume and only later switched to the central part.

scholarly journals Early Tertiary, low-potassium tholeiites from exploration wells on the West Greenland shelf

1987 ◽  
Vol 136 ◽  
pp. 1-25
Author(s):  
N Hald ◽  
J.G Larsen
Keyword(s):  
Baffin Island ◽  
Quaternary Sediments ◽  
The South ◽  
The West ◽  
Baffin Bay ◽  
West Greenland ◽  
Early Tertiary ◽  
Davis Strait ◽  
Low Potassium

Data on the Tertiary basalts in the Davis Strait region are reported from two exploration wells drilled by Arco and Mobil on the West Greenland shelf. Hellefisk 1 (67°53 'N, 56°44'W), situated only 60 km east of the mid-line in Davis Strait, penetrated the upper 690 m of a subaeriallava sequence continuous with the onshore volcanics of Disko and situated beneath 2.3 km of Paleocene to Quaternary sediments. The lavas are feldspar microporphyritic tholeiites and mostly unmetamorphosed despite the presence of laumontite and prehnite in the vesicular top zones. Nukik 2 (65°38'N, 54°46'W) penetrated 150 m of hyaloclastites and tholeiitic olivine dolerite sheets, presumably sills, some 200 km further to the south. These vo1canics are also deeply buried and are of unknown extension. The drilled rocks, except for the much altered hyaloclastites in the Nukik 2 well, have low contents of Ti02 (0.99-2.03%), K2O (0.09-0.18%) and P2O5 (0.08-0.21%), La/Sm ratios less than one and 87Sr/86Sr ratios of 0.7032 to 0.7044. Chemically they are related to the MORB-like picrites of Baffin Island rather than the less depleted tholeiites of West Greenland. In both areas the MORB affinity may be related to eruptions through a strongly attenuated lithosphere associated with the opening of Baffin Bay and Davis Strait.

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