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

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Pingu 845 m Upper Rinks Dal Member sill Umiussat Member Pingu Member Assoq Member sill sill Inngigissoq 845 m U. Rinks Dal Member sill P Akunneq Member 335 m a.s.l. d Akunneq Member 285 m a.s.l. d Atane Formation Skansen Member Fig. 132. Outcrop of Atanikerluk Formation in the area between Pingu and Inngigissoq on eastern Disko cut by several dykes (d) and sills (for location, see Fig. 124). The boundary between the Atane Formation (Skansen Member) and the Atanikerluk Formation is set at 285 m a.s.l. The boundary at 335 m a.s.l. separates the lower and upper parts of the Akunneq Member (for section, see Fig. 128). P, Pingu Member. tion (Figs 132, 133). The lower part consists of large-scale cross-beddded, coarse-grained sandstones that differ little from the fluvial sandstones of the Atane Formation (Figs 128, 134). The upper part is dominated by finegrained white sands interbedded with thinner horizons of mudstone, carbonaceous mudstone or thin coal seams. Bedding planes in the sandstone are often draped by coaly plant debris. Photogrammetric work shows that the c. 5 m thick mudstones are laterally continuous over a distance of 10 km, and that the proportion of finegrained facies increases in a westerly direction from Pingu to Nuugaarsuk. Locally, the upper sandstones include 2–3 m thick beds with low-angle, composite cross-bedding. Bedform migration directions suggest westerly palaeocurrents. Fossils. Thin mudstone horizons in the Akunneq Member contain Paleocene spores and pollen as well as reworked species of Cretaceous (Cenomanian) age (Croxton 1978a, b; Hjortkjær 1991, D.J. McIntyre, personal communication 2009). The upper part of the Akunneq Member is dominated by Paleocene species identical to those occurring in the Naujât and Pingu Members (Hjortkjær 1991; B.F. Hjortkjær, personal communication 1999). The lower part of the Akunneq Member is dominated by reworked Cenomanian species, and unquestionable Paleocene species are scarce (B.F. Hjortkjær, personal communication 1999; D.J. McIntyre, personal communication 2009). Depositional environment. The Akunneq Member is interpreted as a succession of sandy fluvial deposits interbedded with thin lacustrine mudstones. The sandstones in the lower part of the Akunneq Member are interpreted as deposited in braided channels. The change in grainsize and the ubiquitous coaly plant debris indicate lower energy, and the occasional occurrence of sandy point bar deposits suggests deposition in meandering fluvial channels. The thin but laterally widespread mudstones are interpreted as reflecting short-lived phases of lake formation, and the coal beds represent peat formation. Towards the west, in a downstream direction, the Akunneq 150
Fig. 133. Correlation of the members within the Atanikerluk Formation on north-east Disko. Note the general thinning of units westwards from Pingu to Nuugaarsuk. Altitudes above sea level are indicated. For location, see Fig. 124; for legend, see Plate 1. m 700 Pingu Assoq Member 600 Umiussat Member m 600 Nuugaarsuk 500 400 300 220 Atane Formation Atanikerluk Formation Skansen Member Akunneq Member Pingu Member ? 500 420 400 300 260 ? mud sand mud sand 151
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GEOLOGICAL SURVEY OF DENMARK AND GR
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Contents Abstract . . . . . . . . .
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Preface The onshore Cretaceous-Pale
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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
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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
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Fig. 28. Reference locality of the
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Vaigat Fm Vesterfjeld Slibestensfje
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Gilbert delta in the Ikorfat area (
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150 300 450 100 250 400 m 550 50 20
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Fig. 36. Outcrop of the Upernivik N
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Correlation. The Upernivik Næs flo
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12’ 09’ 15’ 06’ 03’ Saqqa
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m 0 GGU 247801 200 400 247815 ★
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wave-rippled sand streaked mudstone
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the formation in the marine mudston
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d d Fig. 47. Type locality of the S
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Fig. 49. Cross-bedded medium- to co
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and Qaarsut (Fig. 22). Its wider di
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Fig. 52. Two closely spaced section
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Type section. The type section of t
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Fig. 56. Delta front succession of
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Fig. 59. The Kingittoq Member at Ki
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sh L sh ch delta front Vaigat Forma
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Fig. 63. Type locality of the Itivn
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782 Quaternary cover 54° 888 Malig
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Kuugannguaq-Qunnilik Fault and is o
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and include clasts of intraformatio
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deposited in a base-of-slope and ba
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VK 53°30’ 53°15’ Niaqornat Tu
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Umiivik-1 m Overburden ★ ★ No p
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76). Heavily bioturbated interbedde
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Fig. 78. Type locality of the Kussi
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: The TOC [Total Organic Carbon] cont
Page 153 and 154: Fig. 135. Type locality of the Ping
Page 155 and 156: Fig. 137. Lower, sharp boundary of
Page 157 and 158: m 130 125 110 t t invasive lava low
Page 159 and 160: Fig. 141. Upper part of the Assoq M
Page 161 and 162: Brown, R. 1875: Geological notes on
Page 163 and 164: a rosetted spreite trace fossil: Da
Page 165 and 166: ing bark from the Nûgssuaq peninsu
Page 167 and 168: 1998: The syn-volcanic Naajaat lake
Page 169 and 170: Appendix: Place names and localitie
Page 171: Place name Place name P Paatuut sou
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Geological Survey of Denmark and Greenland Bulletin 19 ... - Geus

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