Review of Greenland Avtivities 2001 - Geus

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Kalsbeek, F. & Taylor, P.N. 1999: Review of isotope data for Precambrian rocks from the Disko Bugt region, West Greenland. In: Kalsbeek, F. (ed.): Precambrian geology of the Disko Bugt region, West Greenland. Geology of Greenland Survey Bulletin 181, 41–47. Kalsbeek, F., Taylor, P.N. & Pidgeon, R.T. 1988: Unreworked Archaean basement and Proterozoic supracrustal rocks from northeastern Disko Bugt, West Greenland: implications for the nature of Proterozoic mobile belts in Greenland. Canadian Journal of Earth Sciences 25, 773–782. Kalsbeek, F., Pulvertaft, T.C.R. & Nutman, A.P. 1998: Geochemistry, age and origin of metagreywackes from the Palaeoproterozoic Karrat Group, Rinkian belt, West Greenland. Precambrian Research 91, 383–399. Larsen, L.M. & Rex, D.C. 1992: A review of the 2500 Ma span of alkaline-ultramafic, potassic and carbonatitic magmatism in West Greenland. Lithos 28, 367–402. Nutman, A.P. & Kalsbeek, F. 1999: SHRIMP U-Pb zircon ages for Archaean granitoid rocks, Ataa area, north-east of Disko Bugt, West Greenland. In: Kalsbeek, F. (ed.): Precambrian geology of the Disko Bugt region, West Greenland. Geology of Greenland Survey Bulletin 181, 49–54. Rasmussen, H. & Holm, P.M. 1999: Proterozoic thermal activity in the Archaean basement of the Disko Bugt region and eastern Nuussuaq, West Greenland: evidence from K-Ar and 40 Ar- 39 Ar mineral age investigations. In: Kalsbeek, F. (ed.): Precambrian geology of the Disko Bugt region, West Greenland. Geology of Greenland Survey Bulletin 181, 55–64. 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). Willigers, B.J.A., van Gool, J.A.M., Wijbrans, J.R., Krogstad, E.J. & Mezger, K. 2002: Post-tectonic cooling of the Nagssugtoqidian Orogen and a comparison of contrasting cooling histories in Precambrian and Phanerozoic orogens. Journal of Geology 110, 503–517. Authors’ addresses A.A.G., S.P. & K.T., Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark. E-mail: aag@geus.dk J.N.C. & A.W.K., Department of Geological Sciences, University of Texas at Austin, Austin, TX 78712, USA. 38
The mineral resource potential of the Nordre Strømfjord – Qasigiannguit region, southern and central West Greenland Henrik Stendal, Jette Blomsterberg, Sven Monrad Jensen, Mogens Lind, Heine Buus Madsen, Bo Møller Nielsen, Leif Thorning and Claus Østergaard Assessment of the mineral resource potential of the region between Sukkertoppen Iskappe and the southern part of Nuussuaq, West Greenland (66°N to 70°15´N; Fig. 1) is part of a regional resource assessment programme of the Geological Survey of Denmark and Greenland (GEUS) for 2000–2003. The year 2000 was dedicated to the compilation of existing data and the outlining of target areas for the field work in 2001 and 2002. This report gives a review of the work related to the gold and base metal potential in the Nordre Strømfjord – Qasigiannguit region, mainly based on results from the 2001 field work. Significant geological data have been collected from the region by the Survey, research groups and exploration companies during the past several decades; see Kalsbeek & Nutman (1996), Connelly & Mengel (2000) and van Gool et al. (2002, this volume) for geology, Steenfelt (2001) for geochemistry and Rasmussen & van Gool (2000) and Nielsen & Rasmussen (2002, this volume) for geophysics. Most of the region is easy of access, and exposures are excellent along the shores of the numerous fjords. However, inland areas may locally have extensive Quaternary cover. The target areas (Fig. 2) for the search for mineral occurrences in 2001 were chosen on the basis of compilations of all types of existing data, including the Ujarassiorit (‘public mineral hunt’) programme (e.g. Roos 1998). Previous exploration Exploration companies have been active in different parts of the region since 1960. Kryolitselskabet Øresund A/S conducted mineral exploration and prospecting from the early 1960s until the late 1970s, with particular emphasis on investigations of rust zones (Keto 1963; Vaasjoki 1964, 1965; Kurki 1965a, b; Gothenborg 1980; Gothenborg & Keto 1980). During the geological mapping for the Survey’s 1:100 000 Agto (= Attu) map sheet between 1965 and 1978, discontinuous, stratiform massive iron sulphide mineralisations were found in supracrustal rocks around the fjord Ataneq (Fig. 2; Platou 1967). Nunaoil A/S prospecting in the Agto map sheet area during the early 1990s included helicopterbased regional heavy mineral concentrate and stream sediment sampling that was followed up in selected areas by further investigations (Geyti & Pedersen 1991; Gowen 1992; Sieborg 1992; Grahl-Madsen 1993, 1994). The main target of their investigations was location of base and noble metal deposits in exhalative settings. Later in the 1990s, RTZ Mining and Exploration Ltd (Coppard 1995) and Inco Ltd (Car 1997) prospected for Ni-Cu and PGM deposits, inspired by the spectacular discoveries in rocks of comparable age at Voisey’s Bay, Labrador (Li & Naldrett 1999). Geological setting The study region comprises parts of the Palaeoproterozoic Rinkian mobile belt and Nagssugtoqidian orogenic belt (van Gool et al. 2002, this volume). The 2001 investigations were concentrated in the northern Nagssugtoqidian orogen (NNO), which consists dominantly of Archaean orthogneisses and paragneisses with several thin belts of supracrustal and intrusive rocks. Granitic rocks and numerous pegmatites intrude the gneisses. Palaeoproterozoic rock units are limited to the Arfersiorfik intrusive suite and minor supracrustal sequences (Connelly & Mengel 2000). Metamorphic grade is mainly amphibolite facies; the southern part of the NNO south of Ataneq (Fig. 1) is in granulite facies, as is most of the central Nagssugtoqidian orogen (CNO). The gneisses are intensely folded and exhibit general E–W and NE–SW trends. The Palaeoproterozoic reworking of the Archaean gneisses in the NNO decreases gradually northwards, Geology of Greenland Survey Bulletin 191, 39–47 (2002) © GEUS, 2002 39
Page 1: GEOLOGY OF GREENLAND SURVEY BULLETI
Page 4: Geology of Greenland Survey Bulleti
Page 7 and 8: Contents Numbers of articles corres
Page 9: ■ ■ ■ ■ ■ ■ ■ ■ ■
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 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 68 and 69: Menzies, M.A. & Hawkesworth, C.J. (
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.
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offshore South-East Greenland, onsh
Page 120 and 121:
▲ Albert Heim Bjerge Wordie Gletc
Page 122 and 123:
T D A CW NS placed the lowermost c.
Page 124 and 125:
is abundant and highly diverse, and
Page 126 and 127:
The Heimbjerge Formation comprises
Page 128 and 129:
Late Permian carbonate concretions
Page 130 and 131:
m 25 20 15 B3 L2 B2 Fig. 3. Simplif
Page 132 and 133:
(2001), who pointed out the restric
Page 134 and 135:
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
Page 142 and 143:
Table 2. Summary of selected elemen
Page 144 and 145:
Concluding remarks Observations dur
Page 146 and 147:
Lake-catchment interactions with cl
Page 148 and 149:
lakes. As in earlier reports (e.g.
Page 150 and 151:
Discussion Global climate models pr
Page 152 and 153:
Glaciological investigations on ice
Page 154 and 155:
Fig. 2. The new one-mast design of
Page 156 and 157:
A B N 20 km 1993 1995 Fig. 5. Satel
Page 158 and 159:
Krabill, W., Frederick, E., Manizad
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2001/47: Calibration of stream sedi
Page 162 and 163:
Hanghøj, K., Kelemen, P., Bernstei
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Danmarks og Grønlands Geologiske U
Page 167:
GEOLOGY OF GREENLAND SURVEY BULLETI
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