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

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In Paatuutkløften and at the spur between the coastal escarpment and Ippigaarsukkløften, the Tupaasat Member consists of a 7 m thin unit of pebbly, coarse- to very coarse-grained sandstones and a pebble to cobble conglomerate (Figs 99B, 104). On the eastern slope of Quikassaap Kuua, a 20 m thick set of cross-bedded medium- to coarse-grained sandstone is present. It is well consolidated and forms a vertical cliff (Fig. 100). This cross-bedded sandstone unit was included in the Atane Formation by Koch (1959) in spite of the stronger similarity to the lower part of the Quikavsak Member farther west than to the fluvial sandstones of the Atane Formation. This assignment may have been based on the presence of a small unconformity, possibly associated with a fossil podsol profile that separates the sandstones from the overlying heterolithic deposits, which he referred to as the Quikavsak Member but are here assigned to the Nuuk Qiterleq Member of the Quikavsak Formation. Fossils. Fragments of coal and pieces of coalified wood are common in the member. Fig. 103. Giant-scale, cross-bedded conglomerates and sandstones of the Tupaasat Member. Encircled person for scale. Arrows indicate dip of major foresets. From the coastal slope above Ivisaannguit (for location, see Fig. 40). Depositional environment. The conglomerates and sandstones of the Tupaasat Member form a characteristic suite of very thick sandstone beds deposited by major bedforms related to catastrophic flows. The flows were confined to incised fluvial valleys formed during major tectonic uplift of the basin (Dam et al. 1998a; Dam 2002). From the Tupaasat Member facies alone it is not possible to determine whether deposition took place in a subaerial or a submarine environment. The overlying sediments, how- Fig. 104. Tupaasat Member conglomerate in Paatuutkløften (for location, see Fig. 99B). Hammer for scale. 120
ever, have a fluvio-lacustrine origin, which makes a subaerial environment most likely for the Tupaasat Member. Boundaries. The lower boundary is a major erosional unconformity that follows the base of the incised valley systems. It cuts across faults that bring Lower Paleocene mudstones of the Kangilia Formation against mid- Cretaceous deltaic deposits of the Atane Formation (Figs 98, 99A). The unconformity reflects major tectonic uplift of the basin (Dam 2002). Where the Nuuk Qiterleq Member is present, the upper boundary is gradational and non-erosional (Figs 97, 98). At other localities, the Tupaasat Member is erosionally truncated by the Paatuutkløften Member (Fig. 99). Geological age. The Tupaasat Member is referred to the Early Paleocene (Danian), its age being bracketed by data from the Kangilia Formation below and the Nuuk Qiterleq Member above (Dam 2002; Nøhr-Hansen et al. 2002). Nuuk Qiterleq Member new member History. Strata now referred to the Nuuk Qiterleq Member are equivalent to the Quikavsak Member as described by Koch (1959) from the type section at Quikassaap Kuua. Moreover, the Nuuk Qiterleq Member includes the middle, very fossiliferous unit of the Quikavsak Member described elsewhere in the area by Koch (1959). Name. The member is named after the headland Nuuk Qiterleq (Fig. 2). Distribution. The member is locally exposed along the south coast of Nuussuaq as the fill of an incised valley system extending from Nuuk Qiterleq in the west to Atanikerluk in the east (Fig. 2). It is not recognised in all outcrops of the Quikavsak Formation due to erosion preceding deposition of the succeeding Paatuutkløften Member. Type section. The member is well exposed between Tupaasat and Nuuk Qiterleq. The type section is the same as that for the Tupaasat Member (Figs 97–99). The type section is located at 70°20.75´N, 53°08.75´W. Reference sections. Reference sections occur in Paatuut - kløften and at Quikassaap Kuua (Figs 99B, 100). Thickness. In the type section the member is 23 m thick, at Ivisaannguit 3–6 m, at Paatuut up to 42 m and at Quikassaap Kuua up to 50 m. The thickness is mainly dependent on the depth of erosion into the member prior to deposition of the overlying sandstones of the Paatuutkløften Member (Fig. 105). Lithology. In the type section and in Paatuutkløften, the Nuuk Qiterleq Member is composed of up to 6 m thick coarsening-upward successions, composed of silt- and Paatuutkløften Member Nuuk Qiterleq Member Fig. 105. Nuuk Qiterleq Member erosively overlain by the Paatuutkløften Member in Paatuutkløften (see Fig. 99B). Helicopter (encircled) for scale. Atane Formation 121
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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
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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
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
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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
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
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: Tupaasat Member Atane Formation Fig
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
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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