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 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 Geological map of Atanikerdluk and environs, 1:10 000

1960 ◽  
Vol 23 ◽  
pp. 1-38
Author(s):  
B.E Koch ◽  
K.R Pedersen
Keyword(s):  
Senior Author ◽  
South Coast ◽  
Geological Survey ◽  
The South ◽  
West Greenland ◽  
Geological Conditions ◽  
Junior Author ◽  
Geological Map

The unravelling of the geology of the Atanikerdluk arca is one product of the geological investigations which since 1951 have been carried out along the south coast of the Nûgssuaq peninsula under the Geological Survey of Greenland. The complex of investigations which under the leadership of professor A. Rosenkrantz were concentrated on the geological map Nûgssuaq, and which necessitated the unravelling of the geological conditions of the whole West Greenland sedimentary area in outline, led the senior author of this paper to the Tertiary occurrences of the territory round Atanikerdluk in 1951. Since, there has been worked in this field in the summers of 1952, 1954, and 1956 (B. Eske Koch 1955 and 1959). In 1956 the junior author commenced an investigation of the Cretaceous sequence along the south coast of the Nûgssuaq peninsula to obtain a micropaleontological-stratigraphical cronology.

Tsunami-generating rock fall and landslide on the south coast of Nuussuaq, central West Greenland

2002 ◽  
pp. 73-93 ◽  
Author(s):  
Stig A. Schack Pedersen ◽  
Lotte Melchior Larsen ◽  
Trine Dahl-Jensen ◽  
Hans F. Jepsen ◽  
Gunver Krarup Pedersen ◽  
...  
Keyword(s):  
Coal Mining ◽  
South Coast ◽  
Rock Fall ◽  
Severe Damage ◽  
The South ◽  
Marked Contrast ◽  
West Greenland ◽  
North West ◽  
Mining Town ◽  
The Village

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Schack Pedersen, S. A., Melchior Larsen, L., Dahl-Jensen, T., Jepsen, H. F., Krarup Pedersen, G., Nielsen, T., Pedersen, A. K., von Platen-Hallermund, F., & Weng, W. (1). Tsunami-generating rock fall and landslide on the south coast of Nuussuaq, central West Greenland. Geology of Greenland Survey Bulletin, 191, 73-93. https://doi.org/10.34194/ggub.v191.5131 _______________ During the afternoon of 21 November 2000 the village of Saqqaq in central West Greenland was hit by a series of giant waves. Ten small boats were destroyed, but luckily neither humans nor dogs were killed. The following day a police inspection by helicopter revealed that the giant waves were caused by a major landslide at Paatuut, c. 40 km north-west of Saqqaq on the south coast of Nuussuaq (Figs 1, 2). The landslide deposits were dark grey-brown in colour, in marked contrast to the snow-covered slopes, and protruded as a lobe into the Vaigat strait. Along the adjacent coastlines the snow had been washed off up to altitudes about 50 m a.s.l. and severe damage had been caused at the abandoned coal-mining town Qullissat on the opposite side of Vaigat.

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 An investigation of the igneous rocks on Hareøen and western Nûgssuaq, West Greenland

1971 ◽  
Vol 35 ◽  
pp. 11-13
Author(s):  
N Hald
Keyword(s):  
East Coast ◽  
Geological Mapping ◽  
Igneous Rocks ◽  
South Coast ◽  
The South ◽  
West Greenland ◽  
North West ◽  
North East ◽  
The North ◽  
Basaltic Lavas

Hareøen is an island north-west of Disko in western Greenland. It has the form of a plateau, whose highest point - 512 metres - is found near the south coast. Like the neighbouring parts of Nugssuaq and Disko, Hareøen consists chiefly of Tertiary basaltic lavas. The island first attracted attention on account of the presence of interbasaltic, coal-bearing sediments on the north-east coast. These were already examined by Giesecke in 1811 (Giesecke, 1910) and later among others by Steenstrup (1874) and B.E. Koch (1959). A petrographie investigation of the basalts was first undertaken by Holmes (1919), who described loose fragments rich in K2O. Lavas from the south coast, colleeted and analysed by Pedersen (1970), also have a high content of potash. V. Miinther in the years 1948-49 untertook geological mapping of the island, on which the present investigation is supported (Miinther, in press).

scholarly journals High temperature pyrrhotite and telluric iron mineralisations in western Disko, central West Greenland

1975 ◽  
Vol 75 ◽  
pp. 51-53
Author(s):  
F Ulff-Møller
Keyword(s):  
High Temperature ◽  
West Coast ◽  
Field Work ◽  
The South ◽  
The West ◽  
Joint Zone ◽  
West Greenland

The main purpose of the summer field work was to carry out a detailed investigation of the high temperature niekeliferous pyrrhotite and tellurie iron mineralisation whieh oeeurs in the subvolcanie intrusions of the Hammers Dal Complex (Pedersen, this report, and in press), and to seareh for other occurrenees with an econornic evaluation in view. The dyke-like intrusions are mainly found in gorges in the south facing slope of the E-W trending Hammers Dal, about 10 km from the west coast of Disko. They are exposed only in the upper 400 m of the Rinks Dal Member. The depth of the intrusions was thus 400-500 m below the palaeosurfaee, marked by the weakly eontaminated basalts and more strongly eontaminated 'andesites' of the Niaqussat Member which are considered to be the extrusive equivalents of the intrusions. The magma seems to have intruded along a joint zone dipping about 70° WSW forming pipes or dyke-like bodies plunging gently NNW.

scholarly journals A preliminary study of flow directions of Tertiary hyaloclastites and pahoehoe lava flows on Svartenhuk Halvø, West Greenland

1981 ◽  
Vol 105 ◽  
pp. 28-32
Author(s):  
J.G Larsen
Keyword(s):  
Field Work ◽  
Lava Flows ◽  
West Greenland ◽  
Source Areas ◽  
Preliminary Study ◽  
Flow Directions

Field work on Svartenhuk Halvø in connection with the 1:100 000 map was started in 1980 and a preIiminary description of the basalts is reported here. This work is a continuation of the mapping further south on Ubekendt Ejland (1:100 000 map sheet Igdlorssuit 71 V. 1 Syd, Larsen, in press). A brief summary of the basalts from Svartenhuk Halvø is given by Clarke & Pedersen (1976). The present work is concerned with the oIivine-rich basalts of the lower formation in which flow directions were deduced from foreset bedding in the hyaloclastites (cf. Fuller, 1931) and inclination of pipe amygdales in pahoehoe lava flows (cf. Du Toit, 1907; Waters, 1960; Schmincke, 1967). The aim was to locate the palaeoslope and source areas.

scholarly journals Border relations between the amphibolite facies Finnefjeld gneiss complex and granulite facies grey gneisses in the Fiskefjord area, southern West Greenland

1988 ◽  
Vol 140 ◽  
pp. 49-54
Author(s):  
M Marker ◽  
A.A Garde
Keyword(s):  
Granulite Facies ◽  
Field Work ◽  
Geological Mapping ◽  
Amphibolite Facies ◽  
The South ◽  
West Greenland ◽  
South Eastern ◽  
Gneiss Complex ◽  
Eastern Boundary ◽  
The 1950S

The authors carried out geological mapping in August 1987 at the south-eastern boundary of the Finnefjeld gneiss complex around 65°N. The field work was supported by the GGU cutter 'J. F. Johnstrup'. Based on reconnaissance mapping in the 1950s Berthelsen (1951, 1957,1962) divided the Archaean gneiss terrain in the southem Sukkertoppen district between Godthåbsfjord and Søndre Isortoq into three major tectonic units: the Nordland, the Finnefjeld and the Alangua complexes. This division was also followed by Noe-Nygaard & Ramberg (1961).

scholarly journals Field work in 1986 in the Fiskefjord area, southern West Greenland

1987 ◽  
Vol 135 ◽  
pp. 36-42
Author(s):  
A.A Garde ◽  
S.B Jensen ◽  
M Marker
Keyword(s):  
Field Work ◽  
The South ◽  
Field Mapping ◽  
West Greenland ◽  
Basement Rocks ◽  
Outer Coast

Field mapping of Archaean basement rocks for the Fiskefjord map sheet at the scale 1:100 000, initiated in 1980 (Garde & McGregor, 1982; Garde, 1984, 1986), was continued by four teams in June-August 1986. The authors worked along the outer coast and in the vicinity of Fiskefjord (fig. 1) supported by rubber dinghies and the GGU cutter J. F. Johnstrup. Mapping around the lake Quagssup taserssua and reconnaissance mapping on the northern parts of Bjørneøen and Storø was supported by a Bell Jet Ranger helicopter. V. R. McGregor continued his mapping at the south-western corner of the map sheet area for three weeks in August.

scholarly journals Field work between Fiskefjord and Godthåbsfjord, southern West Greenland

1984 ◽  
Vol 120 ◽  
pp. 45-50
Author(s):  
A.A Garde
Keyword(s):  
Granulite Facies ◽  
Field Work ◽  
Precambrian Basement ◽  
The South ◽  
West Greenland ◽  
Basement Rocks ◽  
Logistic Support

The 1980-1981 field work in Precambrian basement rocks for the Fiskefjord map sheet was continued in 1983. V. R. McGregor mapped granulite facies gneisses south of outer Fiskefjord in the south-western part of the map sheet area. The author worked inland between Godthåbsfjord and Fiskefjord from the eastern map sheet boundary at 50°54'E westwards to 51°45'E (fig. 22) and some notes concerning the lithologies, geometry and geochronology of this area are presented below. The GGU cutter K. J. V. Steenstrup and a Jet Ranger helicopter on weekly charter from Godthåb provided logistic support for the two Fiskefjord teams and for four teams mapping in the Ivisårtoq area (see Brewer et al., this report) as well as for the GGU glaciological station at Qamanârssûp serrnia.

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