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

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Fig. 42. Well-exposed outcrop at Paatuut showing the self-combusted burnt shales (red) that grade into the typical black-and-white unburnt sediments of the Atane Formation (Qilakitsoq Member). Height of section is approximately 50 m. For location, see Fig. 40. burnt shales geographical position was inaccurate (Steenstrup 1874). He suggested that Nordenskiöld had measured the type section of the Atane Formation south-east of the Ataa river, at “the northern end of the Patoot gorges” (Steen - strup 1883b p. 64). Later Rosenkrantz (1970 p. 422) stated that: “... the type locality Atâ, 14 km south-east of the old village Atâ on the south coast of Nûgssuaq, is rather close to Pautût..”, but in Henderson et al. (1976) the type locality of the Atane Formation was again given at Atâ (Ataata Kuua). The exposures along the western and eastern slopes of the Ataata Kuua gorge constitute a long, well-exposed section through the Atane Formation, and this has been measured photogrammetrically (Fig. 15; A.K. Pedersen et al. 2007b). The sedimentological log representing the type section (Fig. 43) was measured in the continuously cored borehole GGU 247801, which reached a depth of 566 m below terrain (76 m below sea level). Reference sections. Skansen, J.P.J. Ravn Kløft, Kingittoq and Qilakitsoq provide well-exposed reference sections for the Atane Formation (Figs 48, 51, 53, 60). The two continuously cored boreholes GGU 247701 and GGU 247901, both from the Paatuut area, are reference boreholes for the Atane Formation. They comprise strata from the Qilakitsoq Member and have been described in detail by Ambirk (2000). Thickness. The Atane Formation occurs in a number of fault blocks (J.M. Hansen 1980b; Chalmers et al. 1999; Marcussen et al. 2001, 2002). The faults are, however, rarely exposed and although they have been recognised on seismic profiles acquired in Vaigat and Uummannaq Fjord (Marcussen et al. 2002), it has not been possible to determine their throw. Furthermore the lower boundary of the formation is very rarely exposed. Therefore the thickness of the Atane Formation can only be given as an estimate. The thickest exposed sections occur at Ivissussat on the south coast of Nuussuaq (700 m) and at Qilakitsoq on central Nuussuaq (800 m). Seismic data from the south coast of Nuussuaq show an unconformity at a depth of 1.5−2 km that has been suggested to represent the base of the Atane Formation (Christiansen et al. 1995; Chalmers et al. 1999). A seismic line across Vaigat indicates a minimum thickness of 3000 m for the Atane Formation (Fig. 44; Marcussen et al. 2001, 2002). Lithology. The Atane Formation comprises mudstones, heteroliths, sandstones and coal beds; the relative proportion of the lithologies varies regionally. The formation is characterised by aggradation of 10–40 m thick depositional cycles, which often coarsen upwards (Fig. 45). The sandstones are typically fine- to medium-grained, well sorted or heterolithic, with various types of cross- Facing page: Fig. 43. Type section of the Atane Formation (and reference section for the Qilakitsoq Member) from Ataata Kuua, borehole GGU 247801. This core documents the stratigraphic interval known from the well-exposed section in the Ataata Kuua river gorge and extends this section down to 76 m below sea level. Tr, transgressive sandstones. For legend see Plate 1; for location, see Fig. 40. 58
m 0 GGU 247801 200 400 247815 ★ ★ 50 250 450 Tr Tr 100 Tr 300 ★ 500 ★ Tr 150 350 Tr 550 ★ Tr vf f m c vc clay silt sand pebbles vf f m c vc clay silt sand pebbles vf f m c vc clay silt sand pebbles 59
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GEOLOGICAL SURVEY OF DENMARK AND GR
Page 4 and 5:
Contents Abstract . . . . . . . . .
Page 7 and 8: Preface The onshore Cretaceous-Pale
Page 9 and 10: Introduction The Nuussuaq Basin bel
Page 11 and 12: chemistry of the Nuussuaq Basin hav
Page 13 and 14: Fig. 5. Plant fossils from the Atan
Page 15 and 16: Peak 2010 m Peak 1900 m Peak 1760 m
Page 17 and 18: A lithostratigraphy for the marine
Page 19 and 20: to provide further funding for stud
Page 21 and 22: DGR Geological setting As a result
Page 23 and 24: TSS 8 Agatdal Fm Eqalulik Fm Kangil
Page 25 and 26: A Svartenhuk Halvø 50 km B Hinterl
Page 27 and 28: Nuussuaq Group new group History. T
Page 29 and 30: ley (Figs 2, 40, 65). The section a
Page 31 and 32: Central Nuussuaq Agatdalen South co
Page 33 and 34: 3 10 4 6 5 Qorlortorssuaq Slibesten
Page 35 and 36: volcanic sediments are referred to
Page 37 and 38: Fig. 20. View from Uummannaq toward
Page 39 and 40: In the Kuuk area, the sediments ove
Page 41 and 42: m m 15 14 14 13 12 11 10 9 8 7 6 5
Page 43 and 44: 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: 12’ 09’ 15’ 06’ 03’ Saqqa
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 and 96: 76). Heavily bioturbated interbedde
Page 97 and 98: 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
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channellised, high-density currents
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Thickness. The Annertuneq Conglomer
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Fig. 96. A: Type locality of the Oy
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On Svartenhuk Halvø, on the east s
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Fig. 100. Reference locality of the
Page 119 and 120:
Tupaasat Member Atane Formation Fig
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ever, have a fluvio-lacustrine orig
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etween Tupaasat and Nuuk Qiterleq a
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Vaigat Formation sill Quikavsak For
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Fig. 112. The sharp boundary betwee
Page 129 and 130:
Agatdal Formation Eqalulik Formatio
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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
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Fig. 121. Well reference section of
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Pedersen 1978). The beds are usuall
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In detail, however, the boundary be
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Fig. 126. Composite type section of
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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
Page 151 and 152:
Fig. 133. Correlation of the member
Page 153 and 154:
Fig. 135. Type locality of the Ping
Page 155 and 156:
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
Page 161 and 162:
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
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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