scholarly journals Noritic rocks and associated nickel-copper-sulphide occurrences in Sukkertoppen district, central West Greenland

1983 ◽  
Vol 115 ◽  
pp. 30-34
Author(s):  
K Secher
Keyword(s):  
Mineral Resources ◽  
Field Work ◽  
General Description ◽  
Copper Sulphide ◽  
West Greenland ◽  
Gneiss Complex ◽  
Nickel Copper ◽  
Geophysical Investigations ◽  
Geochemical Investigation ◽  
Rock Suite

Field work in 1982 included detailed mapping and collection of samples of sulphide occurrences in the so called 'norite belt', Sukkertoppen district. Several nickel-copper-sulphide mineralisations related to norite rocks are known from the work of Kryolitselskabet Øresund A/S who mapped this rock suite and carried out exploratory investigations of the sulphides (Nielsen, 1976). The earlier mapping has revealed a suite of metabasic plutonic rocks of mainly noritic composition which are situated in an arcuate belt, approximately 15 x 75 km, curving around the Finnefjeld gneiss complex east of Sukkertoppen (fig. 8). Metanorites are embedded in quartzo-feldspathic gneisses and rarely in amphibolitic rocks, and they occur as a series of irregular pods up to 6 km Iong within the arcuate belt. The present investigation was carried out as part of GGU's mineral resources mapping and evaluation programme in central West Greenland, which this year focussed on the area covered by the 1:250000 map sheet 65 V.2. The fieId work was carried out in dose cooperation with teams doing systematic reconnaissance geochemical stream-sediment and water sampling (to be discussed elsewhere), detailed soil geochemical investigation (Jensen & Secher, this report) and experimental geophysical investigations (Thorning, this report). The present work aimed at a general description of the structure and the metallogenetic behaviour of the known norite-related sulphide occurrences in order to reach an understanding of the mineral genesis within this section of the Archaean environment.

scholarly journals Disko Bugt Project 1991, West Greenland

1992 ◽  
Vol 155 ◽  
pp. 36-41
Author(s):  
F Kalsbeek ◽  
F.G Christiansen
Keyword(s):  
Mineral Resources ◽  
Field Work ◽  
Project Work ◽  
Economic Potential ◽  
West Greenland ◽  
North East ◽  
The North ◽  
Field Investigations ◽  
Second Year ◽  
Proterozoic Basement

One of GGU's major field activities in 1991 took place in July and August in the Disko Bugt region of central West Greenland. This was the third year of field investigations under the 'Disko Bugt Project', planned for 1999–1992, with one summer's break in 1990. The project spreads over various activities and over two very different geological provinces: the Archaean-Proterozoic basement east and north-east of Disko Bugt, and the onshore part of the Cretaceous-Tertiary basin in the west, on Disko and the western part of Nugssuaq (Fig. 1). In 1989, the second year of the project, work was concentrated in the eastern basement part of the study area, and in 1991 this work was brought to conclusion. In 1992 field work (including a shallow core drilling campaign) will be concentrated in the sediments and volcanics on Nugssuaq and Svartenhuk Halvø to the north. The main aim of the Disko Bugt Project is to provide a background for the evaluation of the economic potential of the regional mineral resources, mainly in the Precambrian basement, and the hydrocarbon potential of the neighbouring basin offshore (see Kalsbeek, 1989. 1990).

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 Tectonostratigraphic terranes within Archaean gneiss complexes: examples from Western Australia and southern West Greenland

1991 ◽  
Vol 39 ◽  
pp. 199-211
Author(s):  
Allen P. Nutman
Keyword(s):  
Western Australia ◽  
Field Work ◽  
Ion Microprobe ◽  
Late Archaean ◽  
West Greenland ◽  
Tectonic Processes ◽  
Gneiss Complex ◽  
Northwestern Margin ◽  
Geological Boundaries ◽  
Orogenic Belts

New field work and isotopic data show that the Godthabsfjord region of West Greenland consists of a collage of tectonostratigraphic terranes, which evolved separately prior to tectonic juxtaposition in the late Archaean. In Western Australia the Narryer Gneiss Complex, which lies on the northwestern margin of the Yilgarn Craton, is, unlike the Godthabsfjord region, very poorly exposed (less than 1 % ). In consequence it is impossible to follow geological boundaries in this complex, and instead the complex has been studied by a very extensive use of within-grain zircon U-Pb geochronology on the ion microprobe SHRIMP. The zircon geochronology suggests that the Narryer Gneiss Complex also consists of several discrete terranes of early to mid Archaean gneisses. In both the Godthabsfjord region and the Narryer Gneiss Complex, late Archaean juxtaposition of terranes was accompanied by intrusion of crustally­derived granites, deformation, and amphibolite facies metamorphism. Thus some Archaean high grade gneiss complexes consist of terranes that underwent independent evolution until they were brought together at a later time. In this respect their anatomy resembles post-Archaean orogenic belts that formed as a consequence of plate tectonic processes.

scholarly journals Geophysical investigations of the Qaqarssuk Carbonatite Complex, southern West Greenland

1987 ◽  
Vol 135 ◽  
pp. 25-35
Author(s):  
M Kjærgaard ◽  
C Knudsen ◽  
N Abrahamsen
Keyword(s):  
Field Work ◽  
Residual Soil ◽  
General Description ◽  
Economic Interest ◽  
Carbonatite Complex ◽  
Geophysical Field ◽  
Shallow Seismic ◽  
Geophysical Investigations ◽  
Sketch Map ◽  
Made In

During the summers of 1984 and 1985, geophysical investigations were made in the Qaqarssuk area, situated 65°23'N, 51°40'W, in connection with exploration for phosphorus, niobium and lanthanide deposits of potential economic interest. The geophysical field work carried out in the summer of 1984 has previously been briefly discussed (Kjærgaard & Olsen, 1985a). Most of the interpretations have now been completed, some of which are presented below, together with the new results from 1985. The investigations focussed on three subjects: (1) Shallow seismic and geoelectric measurements to map the thickness of residual soil (possibly enriched in P and Nb) overlying the carbonatite. (2) Radiometric meaSurements to localise pyrochlore-rich (V bearing) and lanthanide-rich carbonatites (Th bearing). (3) Magnetic investigations, primarily to map the structures in the carbonatite. A general description of the geology of the complex is given in Knudsen (1985) and Knudsen (1986). A geological sketch map is shown in fig. 1.

scholarly journals Review of the Survey's activities in 1988

1989 ◽  
Vol 145 ◽  
pp. 5-10
Author(s):  
M. Ghisler
Keyword(s):  
Mineral Resources ◽  
Field Work ◽  
Home Rule ◽  
West Greenland ◽  
North East ◽  
Geological Surveys ◽  
Administrative Personnel ◽  
Additional Reduction ◽  
Insight Into ◽  
Geological Research

During 1988 GGU started two major field projects in Greenland, one in North-East Greenland, and another in West Greenland in the Disko Bugt area. In addition petroleum geological investigations in Jameson Land and glacio-hydrological studies in West Greenland continued. A total of 84 participants were engaged in the field work. The scientific and technical staff at GGU in Copenhagen continued research on material collected in Greenland; total staff including administrative personnel numbers at present 108. A 10 per cent reduction of the staff is forecast over the next four years, combined with an additional reduction of the budget by 14 per cent. Accordingly, decreasing activity in both field work in Greenland and laboratory work in Copenhagen is expected. This development, rather similar to the trend in other western European geological surveys, willlead to a relatively greater engagement in applied geological projects and to less basic geological research. The Act on Mineral Resources in Greenland was revised in 1988 by agreement between the Danish Parliament and the Greenland Home Rule Authority. In accordance with this, all revenues from mineral exploitation in Greenland up to 500 million kroner per year wiIl be distributed with 50% to the Danish State and 50% to the Greenland Home Rule Authority, independent of the annual capital transfers from Denmark to Greenland. In addition the Home Rule Authority's access to, insight into, and influence on the Danish administration of Greenland's mineral resources (including GGU) are increased in various respects. The agreement is valid until at least 1995.

scholarly journals Geophysical investigations at the Inland Ice margin of the Pâkitsoq basin, central West Greenland

1986 ◽  
Vol 130 ◽  
pp. 114-121
Author(s):  
L Thorning ◽  
H.H Thomsen ◽  
E Hansen
Keyword(s):  
Field Work ◽  
Magnetic Survey ◽  
West Greenland ◽  
Considerable Success ◽  
Marginal Areas ◽  
Geophysical Investigations ◽  
Ground Magnetic ◽  
Inland Ice

In recent years much effort has been directed towards investigation of the margin of the Inland Ice in connection with possible development of hydropower. The thickness of the ice and thus the subglacial relief has been difficult to determine. Electromagnetic reflection (EMR) techniques have been used over large parts of the Inland Ice with considerable success, but have so far not produced good results in the marginal areas of the Inland Ice. This note reports the successful application of EMR techniques to an area of the Inland Ice adjacent to the Piikitsoq basin near Jakobshavn, central West Greenland, together with a ground magnetic survey over a smaller part of the area. The field areas are shown in fig 1. The field work was carried out by LT and ER during a five week period in July-August 1985.

Karrat 97: reconnaissance mineral exploration in central West Greenland

1998 ◽  
pp. 73-80 ◽  
Author(s):  
Agnete Steenfelt ◽  
Bjørn Thomassen ◽  
Mogens Lind ◽  
Johannes Kyed
Keyword(s):  
Stream Water ◽  
Mineral Exploration ◽  
Regional Scale ◽  
Mining Industry ◽  
Mineral Resources ◽  
Field Work ◽  
Geochemical Data ◽  
Joint Project ◽  
Project Area ◽  
West Greenland

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Steenfelt, A., Thomassen, B., Lind, M., & Kyed, J. (1998). Karrat 97: reconnaissance mineral exploration in central West Greenland. Geology of Greenland Survey Bulletin, 180, 73-80. https://doi.org/10.34194/ggub.v180.5089 _______________ The Karrat 97 project aims at the acquisition of geochemical data from drainage samples and information on mineralisation within a 10 000 km2 area, which stretches from Uummannaq northwards to Prøven (i.e. from 70°30′ to 72°30′ N; Fig. 1). The project area comprises a major Palaeoproterozoic supracrustal unit, the Karrat Group, from which the project takes its name, and which hosts the abandoned Black Angel lead-zinc mine. It is a joint project between the Geological Survey of Denmark and Greenland (GEUS) and the Bureau of Minerals and Petroleum (BMP), Government of Greenland, and wholly funded by the latter. The goal of the project is to win back the interest of the mining industry to the area. The eastern part of the project area is difficult of access due to alpine topography with peaks up to 2300 m, abundant glaciers, and steep-sided, often ice-filled fjords. A somewhat more gentle topography prevails in the western parts of the area. The whole area is underlain by permafrost. Field work was carried out during seven weeks in July–August 1997 by a team of four geologists and four local prospectors. Job-training of the prospectors was an integral purpose of the project, and the manning of the teams was periodically changed so that all four prospectors were introduced to the different topographical and geological terrains in the area as well as to the methods of operation. A chartered 68 foot, 77 tons vessel – M/S Nukik – served as mobile base with accommodation and meals on board; a MD 500 E helicopter with crew chartered through Grønlandsfly A/S participated for one month. The work was carried out from five anchorages, with the helicopter stationed on the adjacent coast. The weather was relatively unstable in the field period, but only five days of work were lost due to bad weather. The field work comprised regional-scale systematic drainage sampling, and detailed mineral exploration at selected sites. The sampling of stream sediment and stream water supplements the geochemical mapping programme of Greenland undertaken jointly by GEUS and BMP (Steenfelt 1993, 1994), the aim of which is to provide systematic, quality controlled geochemical data. The data are used together with geological and geophysical information in the evaluation of the potential for economic mineral resources. Samples were collected by two teams, transported by helicopter or small boats. All ice-free, near-coastal localities were sampled by the boat team, whereas all other localities were sampled by the helicopter team. The results of this work have been reported on by Steenfelt et al. (1998). The detailed mineral exploration was follow-up work on previously outlined indications and anomalies. It was carried out by two teams on daily trips by rubber dinghy or helicopter, or by foot traverses from field camps. This part of the project has been reported on by Thomassen & Lind (1998).

scholarly journals Mapping of the Isukasia sheet, southern West Greenland

1983 ◽  
Vol 115 ◽  
pp. 20-29
Author(s):  
A.A Garde ◽  
R.P Hall ◽  
D.J Hughes ◽  
S.B Jensen ◽  
A.P Nutman ◽  
...  
Keyword(s):  
Field Work ◽  
Late Archaean ◽  
West Greenland ◽  
North East ◽  
The North ◽  
Base Camp ◽  
Geophysical Investigations ◽  
Set Up

Field work for the Isukasia map sheet north of Godthåbsfjord, started in 1981 (Allaart et al., 1982), was continued in 1982. A tent base camp was set up at the fjord Kangiussaq both summers. In 1982 seventeen fjeld teams and the glaciological station Qamanârssup sermia were supplied from the base by the GGU cutter J. F. Johnstrup and by a Jet Ranger helicopter based in Kangiussaq. Twelve mapping geologists worked on the two map sheets Ivisartoq and Isukasia, and five teams carried out ore geological, geochemical and geophysical investigations (see Appel, Chadwick et al., Jensen & Secher, and Secher, this volume). The field work was carried out from June 20th to August 28th. The Isukasia map sheet is situated north-east of the head of Fiskefjord, around the lake Taserssuaq. To the east it is bounded by the Inland lee, from which the glacier Sarqap sermia enters Taserssuaq. Most of the area is a lake strewn, undulating plateau at elevations between 500 and 800 m. Outcrops are generally good aIthough there are some Quaternary boulder fields, the largest of whieh extends over some 25 km2 in the north-east corner of the map sheet. The north-north-east trending Ataneq fauIt zone (see below), which oeeurs some 25 km east of Taserssuaq, separates an area of early Archaean rocks (induding the Isua supracrustals) from rocks to its west of probable late Archaean age. The younger rocks make up the bulk of the Isukasia map sheet.

Upernavik 98: reconnaissance mineral exploration in North-West Greenland

1999 ◽  
pp. 39-45 ◽  
Author(s):  
Bjørn Thomassen ◽  
Johannes Kyed ◽  
Agnete Steenfelt ◽  
Tapani Tukiainen
Keyword(s):  
Mineral Exploration ◽  
Mining Industry ◽  
Field Work ◽  
Geological Survey ◽  
Original Series ◽  
West Greenland ◽  
North West ◽  
One Year

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Thomassen, B., Kyed, J., Steenfelt, A., & Tukiainen, T. (1999). Upernavik 98: reconnaissance mineral exploration in North-West Greenland. Geology of Greenland Survey Bulletin, 183, 39-45. https://doi.org/10.34194/ggub.v183.5203 _______________ The Upernavik 98 project is a one-year project aimed at the acquisition of information on mineral occurrences and potential in North-West Greenland between Upernavik and Kap Seddon, i.e. from 72°30′ to 75°30′N (Fig. 1A). A similar project, Karrat 97, was carried out in 1997 in the Uummannaq region 70°30′–72°30′N (Steenfelt et al. 1998a). Both are joint projects between the Geological Survey of Denmark and Greenland (GEUS) and the Bureau of Minerals and Petroleum (BMP), Government of Greenland, and wholly funded by the latter. The main purpose of the projects is to attract the interest of the mining industry. The field work comprised systematic drainage sampling, reconnaissance mineral exploration and spectroradiometric measurements of rock surfaces.

Mantle xenoliths from Tertiary lavas and dykes on Ubekendt Ejland, West Greenland

1998 ◽  
pp. 152-154
Author(s):  
Stefan Bernstein ◽  
C. Kent Brooks
Keyword(s):  
Field Work ◽  
Mantle Xenoliths ◽  
Alkaline Basalt ◽  
Basalt Flow ◽  
Volcanic Province ◽  
East Greenland ◽  
Original Series ◽  
West Greenland ◽  
Ultramafic Xenoliths ◽  
Extensive Collection

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Bernstein, S., & Brooks, C. K. (1998). Mantle xenoliths from Tertiary lavas and dykes on Ubekendt Ejland, West Greenland. Geology of Greenland Survey Bulletin, 180, 152-154. https://doi.org/10.34194/ggub.v180.5099 _______________ Mantle xenoliths were found in Tertiary alkaline (basanitic) lavas on Ubekendt Ejland in West Greenland in the mid 1970s by J.G. Larsen. Microprobe analyses of olivine, pyroxene and spinel in two mantle xenoliths, suggested that the xenoliths on Ubekendt Ejland are highly depleted and have high modal olivine contents, and low modal orthopyroxene and clinopyroxene (Larsen 1982). In this respect the mantle xenoliths from Ubekendt Ejland are very similar to the spinel harzburgites from Wiedemann Fjord, in the Tertiary volcanic province of East Greenland (Brooks & Rucklidge 1973; Bernstein et al. 1998). Larsen (1981) also reported dykes containing mantle nodules and a varied suite of cumulates and megacrysts, one of which has subsequently been dated to 34.1 ± 0.2 Ma (Storey et al. 1998) The basalt flow that carries the xenoliths is from what is defined as the Erqua Formation which occurs at the top of the lava succession in western Ubekendt Ejland (Fig. 1; Drever & Game 1948; Larsen 1977a, b). The basalts have not been dated, but are younger than 52.5 Ma, which is the date obtained for the underlying formation (Storey et al. 1998). During July 1997, we spent three weeks collecting xenoliths and prospecting for xenolith-bearing dykes in the Uummannaq district of central West Greenland. The field work resulted in an extensive collection of xenoliths from an alkaline basalt flow described by Larsen (1977a, b), as well as the discovery of a dyke carrying a large number of ultramafic xenoliths of various origins. 

Sign in / Sign up

Export Citation Format

Share Document