Review of Greenland Avtivities 2001 - Geus

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Menzies, M.A. & Hawkesworth, C.J. (eds) 1987: Mantle metasomatism, 472 pp. London: Academic Press. Mitchell, R.H., Scott Smith, B.H. & Larsen, L.M. 1999: Mineralogy of ultramafic dikes from the Sarfartoq, Sisimiut and Maniitsoq areas, West Greenland. In: Gurney, J.J. et al. (eds): Proceedings of the VIIth International Kimberlite Conference 2, 574–583. Cape Town: Red Roof Design cc. Nimis, P. & Taylor, W.R. 2000: Single clinopyroxene thermobarometry for garnet peridotites. Part I. Calibration and testing of a Cr-in-Cpx barometer and an enstatite-in-Cpx thermometer. Contributions to Mineralogy and Petrology 139, 541–554. Nixon, P.H. (ed.) 1987: Mantle xenoliths, 864 pp. Chichester: John Wiley & Sons. Nixon, P.H. 1995: A review of mantle xenoliths and their role in diamond exploration. Journal of Geodynamics 20, 302–329. Olsen, H.K., Jensen, S.M., Schønwandt, H.K. & Helmstaedt, H.H. 1999: Review of diamond exploration in Greenland. North Atlantic Minerals Symposium, Dublin, Ireland, 19–22 September, 1999. Extended abstracts volume, 166–168. Ryan, C.G., Griffin, W.L. & Pearson, N.J. 1996: Garnet geotherms: pressure–temperature data from Cr-pyrope garnet xenocrysts in volcanic rocks. Journal of Geophysical Research 101, 5611–5625. Scott, B.H. 1981: Kimberlite and lamproite dykes from Holsteinsborg, West Greenland. Meddelelser om Grønland Geoscience 4, 24 pp. Secher, K. & Larsen, L.M. 1980: Geology and mineralogy of the Sarfartôq carbonatite complex, southern West Greenland. Lithos 13, 199–212. Shimizu, N. & Sobolev, N.V. 1995: Young peridotitic diamonds from the Mir kimberlite pipe. Nature 375, 394–397. Steenfelt, A. 1991: Reconnaissance geochemical mapping of southern West Greenland from 62°30´ N to 64°00´ N – 1991 results. Open File Series Grønlands Geologiske Undersøgelse 91/9, 21 pp. Steenfelt, A. 1997: High Ba–Sr–P–REE components in Early Proterozoic magmas within the Nagssugtoqidian orogen, West Greenland. Posters and Abstracts. 9th EUG symposium. Terra Nova 9, 360 only. Steenfelt, A. 1998: The Nagssugtoqidian orogen imaged by geochemical maps. In: Wilson, J.R. (ed.): 23. Nordiske geologiske vintermøde, Aarhus, Denmark, 13–16 January, 1998. Abstract volume, 234 only. Aarhus, Denmark: University of Aarhus. Steenfelt, A. 1999: Compilation of data sets for a geochemical atlas of West and South Greenland based on stream sediment surveys 1977 to 1997. Danmarks og Grønlands Geologiske Undersøgelse Rapport 1999/41, 33 pp. Steenfelt, A. 2001a: Calibration of stream sediment data from West and South Greenland. A supplement to GEUS Report 1999/41. Danmarks og Grønlands Geologiske Undersøgelse Rapport 2001/47, 43 pp. Steenfelt, A. 2001b: Geochemical atlas of Greenland – West and South Greenland. Danmarks og Grønlands Geologiske Undersøgelse Rapport 2001/46, 39 pp. + 1 CD-ROM. Steenfelt, A., Dam, E. & Nielsen, J.P. 1993: Reconnaissance geochemical mapping of map sheets 67 V.1 and 68 V.1 (66° to 68° N, 51°25´ to 54°W), West Greenland. Open File Series Grønlands Geologiske Undersøgelse 93/1, 18 pp. van Gool, J.A.M. et al. 2002: Precambrian geology of the northern Nagssugtoqidian orogen, West Greenland: mapping in the Kangaatsiaq area. Geology of Greenland Survey Bulletin 191, 13–23 (this volume). Authors’ address Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark. E-mail: smj@geus.dk 66
Aeromagnetic survey in central West Greenland: project Aeromag 2001 Thorkild M. Rasmussen The series of government-funded geophysical surveys in Greenland was continued during the spring and summer of 2001 with a regional aeromagnetic survey north of Uummannaq, project Aeromag 2001 (Fig. 1). The survey added about 70 000 line kilometres of high-quality magnetic measurements to the existing database of modern airborne geophysical data from Greenland. This database includes both regional high-resolution aeromagnetic surveys and detailed surveys with combined electromagnetic and magnetic airborne measurements. High-quality magnetic data are now available for all the ice-free area of West and South Greenland from the southern tip of Greenland to Upernavik Kujalleq/Søndre Upernavik (Fig. 1). The total surveyed area with highresolution magnetic data is 250 000 km 2 and corresponds to a total of 515 000 line kilometres. Detailed surveys with combined electromagnetic and magnetic measurements were carried out in six separate surveys in selected areas of high mineral potential during project AEM Greenland 1994–1998, a total of 75 000 line kilometres. Descriptions of the previous surveys can be found in Thorning (1993), Stemp & Thorning (1995), Thorning & Stemp (1996, 1998), Stemp (1997), Rasmussen & Thorning (1999), Rasmussen & van Gool (2000) and Rasmussen et al. (2001). The primary objective of the government-funded airborne geophysical programme is to provide the industry and the geoscientific community with modern data that are relevant to the exploration for mineral resources and for the general understanding of the geology of Greenland. Most of the previous surveys have covered onshore areas. However, the survey in 2001, like the survey in 1997 in the Disko Bugt region, also included significant offshore areas. Approximately one third of the 2001 survey region is offshore, and includes an area well known for its hydrocarbon potential (Christiansen et al. 1995, 2000). The Aeromag 2001 survey block in central West Greenland extends between latitudes 70°30´ and 72°12´N, covering the entire ice-free land area together with a part of the offshore area and the border of the Inland Ice (Figs 1, 2). The 2001 survey was flown for the Bureau of Minerals and Petroleum, Government of Greenland by Sander Geophysics Ltd, Ottawa from late May to mid-September. The project was supervised and managed by the Geological Survey of Denmark and Greenland (GEUS). The field operation was based at Qaarsut airport as was the magnetic base station utilised for correction of magnetic diurnal variations. Details of the survey operation and equipment can be found in a report by Sander Geophysics Ltd (2002). Products The survey was carried out by flying along a gently draped surface 300 m above the ground and sea level. Survey lines were aligned in a N–S direction with a separation of 500 m. Orthogonal tie-lines were flown with a separation of 5000 m. Total magnetic field data were recorded with a sampling rate of 0.1 sec which corresponds to a sampling distance of 7 m. The magnetic field at the base station was recorded with a 0.5 sec sampling rate. Aircraft positional data from GPS (Global Positioning System) measurements were recorded with a 1 sec sampling rate, and aircraft altitude measurements obtained from barometric altimeter and radar were recorded with a sampling rate of 0.25 sec. A continuous video-tape record of the terrain passing below the aircraft was made. In addition to the line data obtained from the measurements, maps at scales 1:250 000 and 1:50 000 have been produced by interpolation and gridding of the measured data. Vertical gradient data of the magnetic total field were calculated from the gridded magnetic total field data. Altogether five new maps (magnetic total field intensity, associated vertical gradient, shadow of the total magnetic intensity, combined shadow and colour of magnetic total field intensity and topography) at scale 1:250 000 of the entire survey area and three sets of maps (colour and contours of magnetic total Geology of Greenland Survey Bulletin 191, 67–72 (2002) © GEUS, 2002 67
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GEOLOGY OF GREENLAND SURVEY BULLETI
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Geology of Greenland Survey Bulleti
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Contents Numbers of articles corres
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■ ■ ■ ■ ■ ■ ■ ■ ■
Page 12 and 13:
Canada Pituffik O 1 Thule Air Base
Page 14 and 15:
Publications A complete list of geo
Page 16 and 17:
Canada Greenland Greenland Inland I
Page 18 and 19: northern Nagssugtoqidian orogen (SN
Page 20 and 21: western to the north-eastern corner
Page 22 and 23: group consists of conjugate sets of
Page 24 and 25: y pure shear. Coincidence of the or
Page 26 and 27: The Precambrian supracrustal rocks
Page 28 and 29: 68°25′ 52° 68°25′ BIF 0 3 km
Page 30 and 31: Fig. 4. Dolomitic marble in the sou
Page 32 and 33: Bugt (Fig. 1; Henderson 1969). The
Page 34 and 35: Keto, L. 1962: Aerial prospecting b
Page 36 and 37: ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲
Page 38 and 39: increases towards the south. We obs
Page 40 and 41: Kalsbeek, F. & Taylor, P.N. 1999: R
Page 42 and 43: Canada Nuussuaq 0 50 km PROTEROZOIC
Page 44 and 45: deposit. Descriptions of the differ
Page 46 and 47: Pegmatites The gneisses throughout
Page 48 and 49: tacts with quartzo-feldspathic coun
Page 50 and 51: Geological correlation of magnetic
Page 52 and 53: Fig. 2. The hand-held magnetic susc
Page 54 and 55: Susceptibility distribution (%) Sus
Page 56 and 57: have a reducing effect, which hinde
Page 58 and 59: ancy between the susceptibility val
Page 60 and 61: 67° Sisimiut • 53° 52° 51° 50
Page 62 and 63: Table 1. Range of Nb concentrations
Page 64 and 65: chemical composition - may indicate
Page 66 and 67: Concentration/C1 chondrite 100.00 1
Page 70 and 71: 72°30´ Aeromag 2001 50 km Upernav
Page 72 and 73: 56° 54° 52° 72° 72° nT 71°30
Page 74 and 75: Conclusions The aeromagnetic survey
Page 76 and 77: 53° 51° Inland Ice Greenland 72°
Page 78 and 79: On the south coast of Nuussuaq, wes
Page 80 and 81: Fig. 5. Blocks and boulders in the
Page 82 and 83: 2000 SW NE 1500 Surface trace 1985
Page 84 and 85: 1979). Along other sections of the
Page 86 and 87: Petroleum geological activities in
Page 88 and 89: Seismic acquisition during summer 2
Page 90 and 91: Other petroleum geological work Alt
Page 92 and 93: A multidisciplinary study of the Pa
Page 94 and 95: Seismic interpretation The grid of
Page 96 and 97: Middle Eocene Lower Eocene Upper Pa
Page 98 and 99: Chalmers, J.A., Dahl, J.T., Bate, K
Page 100 and 101: 95-06 ▲ ▲ 58° 95-12 95-10 56°
Page 102 and 103: 70° 71° 60° 2000 2000 2400 400 1
Page 104 and 105: Storey, M., Duncan, R.A., Pedersen,
Page 106 and 107: 24° 100 km 30° 27° 21 ° Jameson
Page 108 and 109: Oligocene Krabbedalen Fm Eocene Bop
Page 110 and 111: grading. Bivalve shell material is
Page 112 and 113: References Birkenmajer, K. 1972: Re
Page 114 and 115: B A 72° Palaeogene basalts Gl 50 k
Page 116 and 117: a b c d e f g h 20 µm i j k l Fig.
Page 118 and 119:
offshore South-East Greenland, onsh
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▲ Albert Heim Bjerge Wordie Gletc
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T D A CW NS placed the lowermost c.
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is abundant and highly diverse, and
Page 126 and 127:
The Heimbjerge Formation comprises
Page 128 and 129:
Late Permian carbonate concretions
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m 25 20 15 B3 L2 B2 Fig. 3. Simplif
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(2001), who pointed out the restric
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Piasecki, S. 1984: Preliminary paly
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66° 68° • • • • • • 7
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absent at Tikeraussaq where a postu
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72° 70° 68° 66° Sample locality
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Table 2. Summary of selected elemen
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Concluding remarks Observations dur
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Lake-catchment interactions with cl
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lakes. As in earlier reports (e.g.
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Discussion Global climate models pr
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Glaciological investigations on ice
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Fig. 2. The new one-mast design of
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A B N 20 km 1993 1995 Fig. 5. Satel
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Krabill, W., Frederick, E., Manizad
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2001/47: Calibration of stream sedi
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Hanghøj, K., Kelemen, P., Bernstei
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Danmarks og Grønlands Geologiske U
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GEOLOGY OF GREENLAND SURVEY BULLETI
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