scholarly journals Investigations of Tertiary volcanic rocks along the south coast of Nûgssuaq and in eastern Disko, 1987

1988 ◽  
Vol 140 ◽  
pp. 28-32
Author(s):  
L.M Larsen ◽  
A.K Pedersen
Keyword(s):  
Volcanic Rocks ◽  
Field Work ◽  
South Coast ◽  
The West ◽  
West Greenland ◽  
Early Tertiary ◽  
Composite Section ◽  
Greenland Basin ◽  
Volcanic Facies ◽  
Integrated Study

As a continuation of an integrated study of sedimentary and volcanic facies in the Cretaceous to Tertiary West Greenland basin (G. K.Pedersen, 1987; A. K. Pedersen & Larsen, 1987) early Tertiary volcanic rocks were studied in 1987 along a NW-SE trending composite section, about 120 km in length; on Niigssuaq and Disko. The study attempts to establish and describe lithostratigraphic volcanic units in the Tertiary volcanic formations, and through a combination of field mapping, photogrammetry and geochemistry to establish chronostratigraphic horizons through the early Tertiary deposits of the region. In this respect it is essential to identify the same eruptive units as subaeriallava facies and as subaqueous lava or hyaloclastite facies, and to trace subaerial tufts throughout the area. In the first part of the season localities along the Vaigat coast of Nûgssuaq from Kugssinerssuaq in the east to Nûssap qâqarssua in the west were investigated. In the second part of the season very poorly known areas in the western and southem part ofthe Kvandalen region on east Disko were investigated. The field work was supported by the Arctie Station in Godhavn and its cutter Porsild as well as by GGU's cutter J. F. Johnstrup.

scholarly journals Early Tertiary volcanic rocks from eastern Disko and south-eastern Nûgssuaq

1987 ◽  
Vol 135 ◽  
pp. 11-17
Author(s):  
A.K Pedersen ◽  
L.M Larsen
Keyword(s):  
Volcanic Rocks ◽  
Volcanic Stratigraphy ◽  
South Eastern ◽  
Early Tertiary ◽  
Clastic Sediments ◽  
Greenland Basin ◽  
Geological Map ◽  
Volcanic Facies ◽  
Volcanic Succession ◽  
Basalt Plateau

As part of an integrated study of the interaction between sedimentary and volcanic facies in the Cretaceous-Tertiary West Greenland basin, early Tertiary extrusive and intrusive basic igneous rocks have been investigated in eastern Disko and south-eastern Nûgssuaq (fig. 1). The volcanic activity started in the early Tertiary. It was centred in the western regions of Disko and Nûgssuaq and west of the present land areas, and consequently western Disko and western Nûgssuaq have a thick and complete volcanic succession, the Vaigat and Maligât Formations (Hald & Pedersen, 1975; Pedersen, 1975a, 1985). The coeval deposits in the eastern part of the basin are clastic sediments of the Upper Atanikerdluk Formation (Koch, 1959). With time, the volcanic deposits prograded eastwards, and eventually the whole area was covered by a coherent basalt plateau. The present study attempts to extend the established volcanic stratigraphy from western Disko and the geological map sheets 1:100 000 Qutdligssat (published in 1976) and Mellemfjord (published in 1987) into eastern Disko and eastern Nûgssuaq where volcanic rocks and sediments interfinger.

scholarly journals A pilot seismo-stratigraphic study on the West Greenland continental shelf

1989 ◽  
Vol 142 ◽  
pp. 1-16
Author(s):  
J.A Chalmers
Keyword(s):  
Petroleum Industry ◽  
Source Rocks ◽  
Tectonic Activity ◽  
The West ◽  
West Greenland ◽  
Main Site ◽  
Half Graben ◽  
Greenland Basin ◽  
Seismic Sections ◽  
Structural Closure

Seismo-stratigraphic interpretation of seismic sections dating from the mid-1970s has disclosed the existence of four megasequences of sediments, the oldest of which has not previously been reported from West Greenland. The basins containing these sediments developed as a series of coalescing half graben, in which the main site of tectonic activity changed with time. A structural closure of sufficient size to contain interesting quantities of hydrocarbons, given suitable source rocks, reservoir and seal, is identified. The study has shown that the evaluation of the West Greenland Basin during the 1970s was inadequate, and that abandonment of exploration by the petroleum industry may have been premature.

scholarly journals Application of seismo-stratigraphic interpretation techniques to offshore West Greenland

1988 ◽  
Vol 140 ◽  
pp. 64-66
Author(s):  
J.A Chalmers
Keyword(s):  
Pilot Study ◽  
Seismic Data ◽  
Seismic Interpretation ◽  
Shelf Break ◽  
The West ◽  
Regional Geology ◽  
West Greenland ◽  
Oil Companies ◽  
Greenland Basin ◽  
Basement Ridge

A pilot study is being conducted to determine if the use of seismo-stratigraphic interpretation techniques can increase the understanding af the geology of offshore West Greenland in order to reassess the prospectivity of the area. During the period 1975 to 1979, a number of concessions offshore West Greenland were licensed to various consortia of oil companies to search for petroleum. Some 40 000 km of seismic data were acquired, all of which is now released. Five wells were drilled, all of them dry, and all concessions were relinquished by the industry by 1979. The regional geology of offshore West Greenland has been summarised by Manderscheid (1980) and Henderson et al. (1981). They show the West Greenland Basin to consist of fairly uniformly westward dipping sediments bordered near the shelf break by a basement ridge. These authors used what may be termed 'conventional' techniques of seismic interpretation. However, since that time the techniques of seismo-stratigraphy (Vail et al., 1977; Hubbard et al., 1985) have become established. They are now being applied to study seismic data acquired during the mid-1970s.

scholarly journals Biostratigraphical zonation and correlation of five Late Cretaceous-Tertiary wells, offshore central West Greenland

1986 ◽  
Vol 130 ◽  
pp. 36-43
Author(s):  
B.B Toxwenius
Keyword(s):  
Late Cretaceous ◽  
The Other ◽  
Geological Survey ◽  
The West ◽  
West Greenland ◽  
Greenland Basin ◽  
Exploratory Wells

During 1976 and 1977, five exploratory wells were drilled offshore central West Greenland, between 65° and 68°N (figs 1 and 2) (Henderson et al., 1981). The Geological Survey of Greenland (GGU) received samples from all the wells, comprising 2228 composite cutting samples (10 m interval), 456 sidewall cores, 30 m conventional core and 3276 samples of varied provenance. From this material, two independent biostratigraphical analyses on 1000 ditch cutting samples and 65 sidewall cores were perforrned within GGU. One survey was based on palynomorphs (Croxton, 1981 and internal reports), the other, by the author, was based on foraminifera and larger diatoms. In addition to GGU's investgations, 14 reports concerning the micropalaeontology and biostratigraphy of the five wells were prepared by exploration companies and consultants on the basis of foraminifera, palynomorphs (identifications by, inter alia J. M. Hansen and L. I. Costa), diatoms, radiolarians and ca1careous/siliceous nannoplankton (identifications by, inter alia K. Perch-Nielsen). This constitutes the total amount of accessibie biostratigraphical data from the offshore part of the West Greenland Basin; it comprises more than 8000 analysed samples. Compilation of the biostratigraphical data from these sources, allows a fairly detailed stratigraphical correlation and understanding of the five wells (Toxwenius, 1986). In this paper a summary of the stratigraphy and successive correlation of the five wells is presented. The lithostratigraphy and sedimentology of the wells have been reported by Rolle (1985).

The nonmarine Cretaceous of the West Greenland Basin, onshore West Greenland

1992 ◽  
Vol 13 (3) ◽  
pp. 263-272 ◽  
Author(s):  
Gunver K. Pedersen ◽  
T.C.R. Pulvertaft
Keyword(s):  
The West ◽  
West Greenland ◽  
Greenland Basin

scholarly journals New methods for the geological analysis of Tertiary volcanic formations on Nuussuaq and Disko, central West Greenland, using multi-model photogrammetry

1992 ◽  
Vol 156 ◽  
pp. 19-34
Author(s):  
A.K Pedersen ◽  
K.S Dueholm
Keyword(s):  
Volcanic Eruption ◽  
Field Work ◽  
South Coast ◽  
The South ◽  
West Greenland ◽  
Model Method ◽  
New Methods ◽  
Clastic Sediments ◽  
Series Of Experiments ◽  
Flow Directions

A series of experiments with multi-model photogrammetry were made during the compilation of a 80 km long section along the south coast of Nuussuaq. The section covers a range of Tertiary volcanic lithologies which overlie Mesozoic to Tertiary clastic sediments. The multi-model method allows the geological analyses of flat-lying lithologies in steep or inaccessible terrain and the compilation of detailed sections, profiles, and block diagrams. Drawing of sections or maps is combined with accurate structural measurements to document the flow directions of both subaerial and subaqueous volcanic units and to demonstrate syn-and post-volcanic basin movements and the location of volcanic eruption sites. Multi-model photogrammetry experiments made by compiling the geology of areas already covered by field work has led to major new discoveries. Similar experiments made on areas, which had not been visited in the field before the compilation, but which were visited later, demonstrates that the method is an important new tool in geological reconnaissance.

scholarly journals On sapphirine-bearing rocks in the vicinity of Sukkertoppen (West Greenland)

1948 ◽  
Vol 1 ◽  
pp. 1-32
Author(s):  
H Ramberg
Keyword(s):  
West Coast ◽  
Field Work ◽  
The West ◽  
West Greenland ◽  
Rock Samples ◽  
Rock Specimens ◽  
Made In

During the journey along the west coast of Greenland where some of the members of the G. G. U.s expeditions of 1946 had to undertake geologic investigations in the Holsteinsborg district, a scattered and casual geologic reconnaissance was made at several places along the coast. After the return to Copenhagen some rock samples from the vicinity of Sukkertoppen appeared to contain the comparatively rare mineral of sapphirine, and a brief examination of these rock specimens was made in spite of the incomplete field work.

scholarly journals Epithermal gold and massive sulphide mineralisation in oil impregnated Palaeogene volcanic rocks of Ubekendt Ejland,West Greenland

2004 ◽  
Vol 4 ◽  
pp. 77-80 ◽  
Author(s):  
Stefan Bernstein ◽  
Christian Knudsen
Keyword(s):  
East Coast ◽  
Volcanic Rocks ◽  
Field Work ◽  
Hydrothermal Activity ◽  
Massive Sulphide ◽  
Sulphide Mineral ◽  
The South ◽  
West Greenland ◽  
Sulphide Mineralisation ◽  
Volcaniclastic Rocks

The discovery in 2002 of a gold mineralised quartz-carbonate vein at Ubekendt Ejland, central West Greenland, yielding 0.6 ppm Au over 0.7 m, led to a reconnaissance sampling project in summer 2003. Most of the accessible quartz-carbonate veins on the south-east coast of the island (Figs 1, 2) were sampled during boat-supported field work. Massive sulphide mineral deposits (Fe-Zn-Pb) were located in the centre of brecciated quartz-carbonate vein systems at several places along the south and south-east coast of the island, and gold anomalies mainly associated with the occurrence of the massive sulphides were identified. Pervasive hydrothermal alteration of the volcanic wall rocks surrounds the quartz-carbonate vein systems, which comprise low-temperature mineral assemblages dominated by dolomite and veined by chalcedony and fibrous silica. Evidence of oil migration into volcaniclastic rocks prior to the intense hydrothermal activity was found in several places in the form of organic carbon, interpreted to be pyrobitumen, that infills pores and cavities in hyaloclastites.

scholarly journals Tectonostratigraphy and evolution of the West Greenland continental margin

2020 ◽  
Vol 67 ◽  
pp. 1-21 ◽  
Author(s):  
Ulrik Gregersen ◽  
Paul C. Knutz ◽  
Henrik Nøhr-Hansen ◽  
Emma Sheldon ◽  
John R. Hopper
Keyword(s):  
Oceanic Crust ◽  
Continental Margin ◽  
Volcanic Rocks ◽  
Sedimentary Basins ◽  
Magnetic Data ◽  
The West ◽  
Seismic Reflection Data ◽  
Baffin Bay ◽  
West Greenland ◽  
North East

Large structural highs and sedimentary basins are identified from mapping of the West Greenland continental margin from the Labrador Sea to the Baffin Bay. We present a new tectonic elements map and a map of thickness from the seabed to the basement of the entire West Greenland margin. In addition, a new stratigraphic scheme of the main lithologies and tectonostratigraphy based on ties to all offshore exploration wells is presented together with seven interpreted seismic sections. The work is based on interpretation of more than 135 000 km of 2D seismic reflection data supported by other geophysical data, including gravity- and magnetic data and selected 3D seismic data, and is constrained by correlation to wells and seabed samples. Eight seismic mega-units (A–H) from the seabed to the basement, related to distinct tectonostratigraphic phases, were mapped. The oldest units include pre-rift basins that contain Proterozoic and Palaeozoic successions. Cretaceous syn-rift phases are characterised by development of large extensional fault blocks and basins with wedge-shaped units. The basin strata include Cretaceous and Palaeogene claystones, sandstones and conglomerates. During the latest Cretaceous, Paleocene and Eocene, crustal extension followed by oceanic crust formation took place, causing separation of the continental margins of Greenland and Canada with north-east to northward movement of Greenland. From Paleocene to Eocene, volcanic rocks dominated the central West Greenland continental margin and covered the Cretaceous basins. Development of the oceanic crust is associated with compressional tectonics and the development of strike-slip and thrust faults, pull-apart basins and inversion structures, most pronounced in the Davis Strait and Baffin Bay regions. During the late Cenozoic, tectonism diminished, though some intra-plate vertical adjustments occurred. The latest basin development was characterised by formation of thick Neogene to Quaternary marine successions including contourite drifts and glacial related shelf progradation towards the west and south-west.

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