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

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Paatuutkløften Member Fig. 110. Basal gneiss-clast conglomerate of the Paatuutkløften Member at Ivissussat Qaqqaat (east slope of Ataata Kuua; for location, see Fig. 40). Person for scale. Atane Formation Boundaries. An erosional unconformity separates the sandstones of the Paatuutkløften Member from the underlying incised valley deposits of the Nuuk Qiterleq or Tupaasat Members (Figs 97, 99, 105). In some cases, the Paatuutkløften Member is incised directly into the Kangilia or Atane Formations suggesting either that the previous deposits within the valley system were completely eroded away or that new valleys were eroded locally (Figs 14, 99, 109, 110). The sandstones of the Paatuutkløften Member are abruptly overlain by mudstones of the Eqalulik Formation (Figs 108, 112). Geological age. The age of the Paatuutkløften Member is bracketed by the Danian age of the underlying Kangilia Formation and the latest Danian to Selandian age of the overlying Eqalulik Formation (see p. 137), suggesting that the age of Paatuutkløften Member is late NP3–NP4 (Nøhr-Hansen et al. 2002). Correlation. The Paatuutkløften Member has been correlated with marine deposits of the Agatdal Formation on central Nuussuaq (Koch 1959; Dam & Sønderholm 1998), and with the Agatdal Formation in the GANE#1 and GRO#3 wells (Nøhr-Hansen et al. 2002). Fig. 111. Uniformly cross-bedded fluvial sandstones of the Paatuutkløften Member at Ippigaarsukkløften (for location, see Fig. 40). The apparent discontinuity in the middle of a section is due to hydrothermal alteration (see Fig. 108). Encircled person for scale. 126
Fig. 112. The sharp boundary between estuarine sandstones of the Paatuutkløften Member and the mudstones of the Eqalulik Formation above. Hammer (left) for scale. From Ippigaarsukkløften (for location, see Fig. 40). Eqalulik Formation Paatuutkløften Member Agatdal Formation revised formation History. The Agatdal Formation was established by Rosenkrantz (in: Koch 1959 pp. 75–78) to encompass Upper Danian marine mudstones, sandstones and conglomerates found in the Agatdalen area on central Nuus - suaq; these sediments were further described by H.J. Hansen (1970), Rosenkrantz (1970) and Henderson et al. (1976). In some papers, the formation is referred to as the Agatdalen Formation. The Agatdalen area was the key study area for the Nûgssuaq Expeditions led by A. Rosenkrantz because of the rich fossil content of the sediments (see ‘Previous work’). Focus was on the fossil assemblages, and the various outcrops (sections) were only shown schematically and described provisionally. The component lithological units of the section were assigned to individual members resulting in a complex lithostratigraphic terminology. Four members were recognised within the small area of outcrop: the Turritellakløft, Andreas, Sonja and Abraham Members. Schematic sections from the localities in the Agatdalen area are shown in Rosenkrantz (1970 figs 4, 5). The outcrops in the Agatdalen area are discontinuous, and because many of the sandstone and conglomerate units are channellised – and lateral facies changes are therefore pronounced – the members are difficult to correlate and map in detail (Figs 113, 114). A possible correlation between the outcrops of the Agatdal Formation is shown in Plate 3. Furthermore, the members cannot be recognised outside the type area and therefore the three lower members are no longer treated as formal units. They are, however, treated as informal members below in order to facilitate correlation between the new data presented here and the older literature and fossil records (see Plate 3). The Agatdal Formation as defined here is entirely prevolcanic. Thus, the Abraham Member, which is synvolcanic, is now included in the new Eqalulik Formation (see below). Rosenkrantz (1970) referred other synvolcanic marine sediments found on Nuussuaq to the tuffaceous Thyasira and Propeamussium Members (abandoned here) of the Kangilia Formation. In Agatdalen, the Turritellakløft Member, from which tuffs are not reported, overlies the Propeamussium Member (Rosenkrantz 1970 fig. 5). The correlation between the pre- and synvolcanic members of the Kangilia and Agatdal Formations of Rosenkrantz is not well explained. Strata assigned to the Agatdal Formation (Sonja Member) at Nassaat north-east of Agatdalen (Fig. 2) by Rosenkrantz (1970 fig. 4c, d) are here assigned to the Quikavsak Formation, following Koch (1959). The tuffaceous deposits of the Abraham Member are coeval with the volcanic Asuk Member of the Vaigat Formation and are therefore now included in the Eqalulik Formation (see p. 137). A sandstone unit underlying the pillow breccias at Kangilia on the north coast of Nuussuaq was tentatively assigned to the Agatdal Formation by H.J. Hansen (1970), Rosenkrantz (1970) and Dam & Sønderholm (1998); this unit is regarded here as forming part of the Eqalulik Formation. 127
Page 1 and 2:
GEOLOGICAL SURVEY OF DENMARK AND GR
Page 4 and 5:
Contents Abstract . . . . . . . . .
Page 7 and 8:
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
Page 17 and 18:
A lithostratigraphy for the marine
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to provide further funding for stud
Page 21 and 22:
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
Page 29 and 30:
ley (Figs 2, 40, 65). The section a
Page 31 and 32:
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
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
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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
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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
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
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: Vaigat Formation sill Quikavsak For
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
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
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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