Geological Survey of Denmark and Greenland Bulletin 19 ... - Geus

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from the Umiivik-1 well indicate a ?Late Turonian – Late Coniacian age for the uppermost 659 m of the well; below this palynomorphs are not preserved due to severe alteration of the mudstones by the Paleocene dolerite intrusions. It is likely, however, that the core includes Cenomanian–Turonian strata (Nøhr-Hansen 1997a; Dam et al. 1998b). Dinocysts from outcrops and from the three shallow wells (GGU 400710, 400711, 400712) along the southern shore of Umiiviup Kangerlua on Svartenhuk Halvø indicate a Santonian to Early Cam - panian age (Nøhr-Hansen 1996). On the north coast of Nuussuaq, the ammonites indicate the presence of Upper Campanian and Maastrichtian strata which is in accordance with palynostratigraphic dating (Birkelund 1965; Nøhr-Hansen 1996). m 50 40 Solifluction, volcanic scree Poorly exposed Kussinerujuk Member new member History. On northern Disko at Kussinerujuk and Asuk, local outcrops of conglomerate, sandstone and mudstone unconformably overlying the Atane Formation have previously been correlated with the Paleocene Kangilia Formation (J.M. Hansen 1980b; Pulvertaft & Chalmers 1990). Later, these beds were included in the Asuup Innartaa Member of the Danian Quikavsak Formation (Dam 2002). On the basis of new biostratigraphic data, however, these are here assigned to the Kussinerujuk Member of Cenomanian–Turonian age (Bojesen-Koefoed et al. 2007). Name. The member is named after Kussinerujuk on the north coast of Disko, where it is exposed in narrow gorges (Fig. 2). Distribution. The member is only known from the north coast of Disko around Kussinerujuk and Asuk. Type section. The type section of the member is in the ravines at Kussinerujuk (Figs 2, 77, 78). The type section is located at 70°13.10´N, 53°27.68´W. Itilli Formation Kussinerujuk Member Atane Formation Kingittoq Member 30 20 10 Fig. 77. Type section of the Kussinerujuk Member (Itilli Formation) at Kussinerujuk, north coast of Disko. For location, see Fig. 2; for legend, see Plate 1. Base of section is c. 450 m a.s.l. 0 vf f m c vc clay silt sand pebbles, cobbles 96
Fig. 78. Type locality of the Kussinerujuk Member (Itilli Formation) at Kussinerujuk. Note the basal erosional boundary with the Atane Formation beneath; the uppermost depositional unit underlying the Kingittoq Member is a dark grey, delta front mudstone. The Kussinerujuk Member is dominated by mud-clast conglomerates with a matrix of sand (see Fig. 77). For location, see Fig. 2. Itilli Fm Kussinerujuk Mb Atane Fm Kingittoq Mb 3 m Reference sections. Reference sections are found in the coastal cliffs east of Asuk (Figs 55, 79). The lithologies here differ from those of the type section but are locally affected by complicated deformation resulting from landslides obscuring the stratigraphic relationships (Bojesen- Koefoed et al. 2007). Thickness. At Kussinerujuk the measured part of the formation is at least 42 m thick (Fig. 77; see also Pulvertaft & Chalmers 1990) but the member may be up to a couple of hundred metres thick. Lithology. The Kussinerujuk Member comprises thinly interbedded mudstones and sandstones, and mudstone clast conglomerates, first described by Pulvertaft & Chalmers (1990 fig. 6). At Kussinerujuk the member consists of mud-clast conglomerates of varying thicknesses, with angular clasts of cobble to boulder size, interbedded with medium- to coarse-grained sandstone (Fig. 77). In some conglomerate beds, the clasts are imbricated whereas other conglomerates appear to be disorganised. Pebble-sized clasts consist of rounded quartz and clay ironstone while angular cobbles and boulders consist of mudstone, sandstone, or interbedded sandstone and mudstone. At Asuk, the Atane Formation is overlain by mudstones and sandstones that are referred to the Kussinerujuk Member. These sediments occur in three separate outcrops. The westernmost of these is seen in Fig. 79, the central outcrop is seen in Fig. 80, and the eastern is seen in the coastal cliff adjacent to the huge alluvial fan at Qorlortorsuaq. The western outcrop is overlain by volcanic breccias and lavas of the Asuk Member (lower part of the Vaigat Formation; Bojesen-Koefoed et al. 2007). The volcanic rocks are part of a major landslide, and the complicated relationships seen in Fig. 79 suggest that the sediments at this locality are also affected by sliding; their stratigraphic relationships with the central and eastern outcrops are thus uncertain. A simplified sedimentological log from the central outcrop is shown in Fig. 55. Here a basal conglomerate of mudstone and sandstone clasts in a matrix of coarsegrained sand erosionally overlies the Atane Formation and is succeeded by parallel-laminated sandstones interbedded with sand-streaked mudstones (Figs 55, 80). The western, landslipped outcrops comprise a unit of parallel-laminated, sand-streaked mudstone, locally with small-scale load structures (Fig. 81A). Other units consist of strongly erosional, channellised sandstones that cut into mudstones (Fig. 81 B); thicker sandstone beds are fine- to medium-grained and show parallel lamination and ripple cross-lamination. Other sandstone beds are structureless and have erosional bases with sole-marks. Fossils. Brackish to marine dinocysts occur in the member and are relatively abundant at Asuk (McIntyre 1994a, b) noted that rich pollen and spore assemblages dominated by bisaccate conifer pollen are present in the type section whereas dinocysts are very rare. Depositional environment. The Kussinerujuk Member records a transgressive event on top of a variably incised 97
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GEOLOGICAL SURVEY OF DENMARK AND GR
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Contents Abstract . . . . . . . . .
Page 7 and 8:
Preface The onshore Cretaceous-Pale
Page 9 and 10:
Introduction The Nuussuaq Basin bel
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chemistry of the Nuussuaq Basin hav
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Fig. 5. Plant fossils from the Atan
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Peak 2010 m Peak 1900 m Peak 1760 m
Page 17 and 18:
A lithostratigraphy for the marine
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to provide further funding for stud
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DGR Geological setting As a result
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TSS 8 Agatdal Fm Eqalulik Fm Kangil
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A Svartenhuk Halvø 50 km B Hinterl
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Nuussuaq Group new group History. T
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ley (Figs 2, 40, 65). The section a
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Central Nuussuaq Agatdalen South co
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3 10 4 6 5 Qorlortorssuaq Slibesten
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volcanic sediments are referred to
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Fig. 20. View from Uummannaq toward
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In the Kuuk area, the sediments ove
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m m 15 14 14 13 12 11 10 9 8 7 6 5
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Kome Formation m 40 30 20 D tial re
Page 45 and 46: Fig. 28. Reference locality of the
Page 47 and 48: Vaigat Fm Vesterfjeld Slibestensfje
Page 49 and 50: Gilbert delta in the Ikorfat area (
Page 51 and 52: 150 300 450 100 250 400 m 550 50 20
Page 53 and 54: Fig. 36. Outcrop of the Upernivik N
Page 55 and 56: Correlation. The Upernivik Næs flo
Page 57 and 58: 12’ 09’ 15’ 06’ 03’ Saqqa
Page 59 and 60: m 0 GGU 247801 200 400 247815 ★
Page 61 and 62: wave-rippled sand streaked mudstone
Page 63 and 64: the formation in the marine mudston
Page 65 and 66: d d Fig. 47. Type locality of the S
Page 67 and 68: Fig. 49. Cross-bedded medium- to co
Page 69 and 70: and Qaarsut (Fig. 22). Its wider di
Page 71 and 72: Fig. 52. Two closely spaced section
Page 73 and 74: Type section. The type section of t
Page 75 and 76: Fig. 56. Delta front succession of
Page 77 and 78: Fig. 59. The Kingittoq Member at Ki
Page 79 and 80: sh L sh ch delta front Vaigat Forma
Page 81 and 82: Fig. 63. Type locality of the Itivn
Page 83 and 84: 782 Quaternary cover 54° 888 Malig
Page 85 and 86: Kuugannguaq-Qunnilik Fault and is o
Page 87 and 88: and include clasts of intraformatio
Page 89 and 90: deposited in a base-of-slope and ba
Page 91 and 92: VK 53°30’ 53°15’ Niaqornat Tu
Page 93 and 94: Umiivik-1 m Overburden ★ ★ No p
Page 95: 76). Heavily bioturbated interbedde
Page 99 and 100: A B Itilli Formation Kussinerujuk M
Page 101 and 102: 160 140 120 100 Vaigat Formation Eq
Page 103 and 104: Fig. 85. Mudstones and conglomerati
Page 105 and 106: Fig. 87. Type section of the Kangil
Page 107 and 108: m 150 140 130 120 110 100 90 Kangil
Page 109 and 110: channellised, high-density currents
Page 111 and 112: Thickness. The Annertuneq Conglomer
Page 113 and 114: Fig. 96. A: Type locality of the Oy
Page 115 and 116: On Svartenhuk Halvø, on the east s
Page 117 and 118: Fig. 100. Reference locality of the
Page 119 and 120: Tupaasat Member Atane Formation Fig
Page 121 and 122: ever, have a fluvio-lacustrine orig
Page 123 and 124: etween Tupaasat and Nuuk Qiterleq a
Page 125 and 126: Vaigat Formation sill Quikavsak For
Page 127 and 128: Fig. 112. The sharp boundary betwee
Page 129 and 130: Agatdal Formation Eqalulik Formatio
Page 131 and 132: Fig. 116. Basal conglomerate unit o
Page 133 and 134: heterolithic deposits of the Kangil
Page 135 and 136: GANE#1 Vaigat Fm Anaanaa Mb m Hyalo
Page 137 and 138: Fig. 121. Well reference section of
Page 139 and 140: Pedersen 1978). The beds are usuall
Page 141 and 142: In detail, however, the boundary be
Page 143 and 144: Fig. 126. Composite type section of
Page 145 and 146: m m 240 340 m Pingu Member 230 230
Page 147 and 148:
Naujât Member Atane Formation, Kin
Page 149 and 150:
The TOC [Total Organic Carbon] cont
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Fig. 133. Correlation of the member
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Fig. 135. Type locality of the Ping
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Fig. 137. Lower, sharp boundary of
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m 130 125 110 t t invasive lava low
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Fig. 141. Upper part of the Assoq M
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Brown, R. 1875: Geological notes on
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a rosetted spreite trace fossil: Da
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ing bark from the Nûgssuaq peninsu
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1998: The syn-volcanic Naajaat lake
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Appendix: Place names and localitie
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Place name Place name P Paatuut sou
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Geological Survey of Denmark and Greenland Bulletin 19 ... - Geus

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