Review of Greenland Avtivities 2001 - Geus

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B A 72° Palaeogene basalts Gl 50 km I I I I I I I I I I Milne Land Vb Scoresby Jameson Land VBK Sund 25° 23° 71° C I I I I I I II I I I Kap Brewster Muslingehjørnet C Post-Caledonian basins Caledonian Bopladsdalen I I Krabbedalen Savoia Halvø I I I I II I I I I Greenland 1 3 Danmark Stræde Scree and ice Kap Brewster Fm Krabbedalen Fm Bopladsdalen Fm Basalts Paleocene sediments Fault Settlement 2 B I I I I I I I 3 km Fig. 1. Map of East Greenland with a simplified geological map of Savoia Halvø based on Birkenmajer (1972, fig. 1). The locality with exposed sub-basaltic sediments is situated adjacent to the Kap Brewster settlement. Inset A: Greenland map; 1: West Greenland, Nuussuaq; 2: North-East Greenland, Wollaston Forland – Hold with Hope – Clavering Ø region; 3: East Greenland, Kangerlussuaq region. Inset B: VBK: Volquart Boon Kyst; Vb: Vikingebugt; Gl: Gåseland. 112
sample was taken 1 m below the first basalt flow. The samples were prepared by standard palynological techniques with HCl and HF. The organic residue was oxidised with HNO 3 , and the microscopic fossils were separated from the terrestrial debris by swirling or the tube separation method of Hansen & Gudmundsson (1979). Marine flora Moderately to well-preserved dinoflagellate cysts are abundant in the mudstone together with an abundance of terrestrial organic material, spores and pollen. All analysed samples contain a rich dinoflagellate flora composed of a mixture of reworked Lower to Upper Cretaceous dinoflagellate cyst assemblages, together with Paleocene marker species. Cretaceous dinoflagellate cysts Stratigraphically significant dinoflagellate cysts in the composite assemblage suggest reworking from multiple sources of Cretaceous sediments or perhaps repeated reworking of Cretaceous dinoflagellate assemblages. Cretaceous dinoflagellate assemblages in East Greenland have been described by Nøhr-Hansen (1993), and mid-Cretaceous to Paleocene dinoflagellate assemblages have been described from corresponding latitudes in West Greenland (Nøhr-Hansen 1996; Nøhr-Hansen et al. in press). The presence of Leptodinium cancelatum and Pseudoceratium expolitum indicates reworking from middle Albian (Lower Cretaceous) strata according to Nøhr- Hansen (1993). Epelidosphaeridia spinosa, Hapsocysta benteae, Ovoidinium sp. 1 Nøhr-Hansen 1993, Rhombodinium paucispina and Subtilisphaera kalaalliti indicate reworking from Upper Albian to Lower Cenomanian strata (Nøhr-Hansen 1993). Chatangiella spp. and Isabelidinium spp. suggest reworking from Upper Cenomanian to Upper Maastrichtian (Upper Cretaceous) strata, and the presence of the pollen genus Aquilapollenites spp. indicates reworking from Campanian to Upper Maastrichtian strata (Upper Cretaceous) according to Nøhr- Hansen (1996). The possibility that even Paleocene strata could be reworked is indicated by the presence of a few Spongodinium delitiense which have a range from Campanian to lower Danian, Paleocene (Hardenbol et al. 1998). These reworked Cretaceous assemblages are very similar to the assemblages described from North-East Greenland (Nøhr-Hansen 1993) and West Greenland (Nøhr-Hansen 1996). Paleocene dinoflagellate cysts Paleocene dinoflagellate cysts are rare to very rare and are generally poorly preserved, but occur in all studied samples (Fig. 2). Poorly preserved Alisocysta spp. (probably A. margarita; Fig. 3a–c) occurs together with Areoligera spp. (Fig. 3d–e), Cerodinium striatum (Fig. 3g–h) and Palaeoperidinium pyrophorum throughout the studied section whereas Phelodinium kozlowskii (Fig. 3i), Palaeocystodinium bulliforme (Fig. 3j–k), Spiniferites septatus (Fig. 3f) and Thalassiphora delicata (Fig. 3l) are restricted to the upper part. The presence of probable Alisocysta margarita suggests a late Danian (61.58 Ma) to early Thanetian (57.16 Ma) age (Hardenbol et al. 1998), but according to the same authors the presence of Palaeocystodinium bulliforme and Palaeoperidinium pyrophorum excludes Paleocene Age early Selandian ? late Danian 50 60 70 80 90 Metres above sea level Kap Brewster GGU sample numbers 246950 246949 246948 246947 246946 246945 246944 246943 246942 246941 246940 459739 459738 Areoligera spp. Cerodinium striatum Palaeoperidinium pyrophorum Alisocysta margarita Spiniferites septatus Areoligera aff. gippingensis Cerodinium spp. Palaeocystodinium bulliforme Phelodinium kozlowskii Thalassiphora delicata Fig. 2. Stratigraphic occurrence of selected in situ Paleocene dinoflagellate cysts in pre-basaltic mudstones at Kap Brewster. 113
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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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■ ■ ■ ■ ■ ■ ■ ■ ■
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Canada Pituffik O 1 Thule Air Base
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Publications A complete list of geo
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Canada Greenland Greenland Inland I
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northern Nagssugtoqidian orogen (SN
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western to the north-eastern corner
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group consists of conjugate sets of
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y pure shear. Coincidence of the or
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The Precambrian supracrustal rocks
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68°25′ 52° 68°25′ BIF 0 3 km
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Fig. 4. Dolomitic marble in the sou
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Bugt (Fig. 1; Henderson 1969). The
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Keto, L. 1962: Aerial prospecting b
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▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲
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increases towards the south. We obs
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Kalsbeek, F. & Taylor, P.N. 1999: R
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Canada Nuussuaq 0 50 km PROTEROZOIC
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deposit. Descriptions of the differ
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Pegmatites The gneisses throughout
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tacts with quartzo-feldspathic coun
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Geological correlation of magnetic
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Fig. 2. The hand-held magnetic susc
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Susceptibility distribution (%) Sus
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have a reducing effect, which hinde
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ancy between the susceptibility val
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67° Sisimiut • 53° 52° 51° 50
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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 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
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
Page 136 and 137: 66° 68° • • • • • • 7
Page 138 and 139: absent at Tikeraussaq where a postu
Page 140 and 141: 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
Page 160 and 161: 2001/47: Calibration of stream sedi
Page 162 and 163: 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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