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

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NW SE 600 m.a.s.l. Peak 1580 Tupaasat 600 m.a.s.l. Vaigat Formation 400 Quikavsak Formation 400 Fig. 98 Paatuutkløften Mb Nuuk Qiterleq Mb Tupaasat Mb Kangilia Formation Atane Formation 200 200 400 600 800 1000 1200 1400 m A 200 NE SW Paatuutkløften Vaigat Formation 750 750 m.a.s.l. m.a.s.l. Quikavsak Formation Paatuutkløften Mb Nuuk Qiterleq Mb Atane Formation 500 Tholeiitic picrite hyaloclastites (covered by scree) Picrite intrusives contemporary with the Vaigat Fm Marine mudstones (Eqalulik Fm) Estuarine sandstones (Paatuutkløften Mb) Fluvial sandstones (Paatuutkløften Mb) Thin estuarine mudstones (Paatuutkløften Mb) 0 250 Lacustrine mudstones and sandstones (Nuuk Qiterleq Mb) Fluvial conglomerates and sandstones (Tupaaasat Mb) Low-energy mudstones and sandstones (Tupaasat Mb) Deep marine mudstones (Kangilia Fm) Deltaic sandstones (Atane Fm) Tupaasat Mb Deltaic and pro-deltaic mudstones and coals (Atane Fm) Bedding planes Fault 500 750 1000 m B 500 116
Fig. 100. Reference locality of the Quikavsak Formation at Quikassaap Kuua (see Fig. 40 for location). This locality was selected by Koch (1959) as the type locality of his Quikavsak Member. The channellised sandstone is now referred to the Tupaasat Member of the Quikavsak Formation (for explanation, see text). 20 m Quikavsak Formation Atane Formation 2002). The lower, markedly erosional unit dominated by coarse-grained sandstones succeeded by a middle unit comprising sand- and silt-streaked mudstones and sandstones with numerous in situ and drifted remains of trees. The upper unit also has an erosional base and consists of medium- to coarse-grained sandstones arranged in an overall fining- and thinning-upward succession, locally with a basal boulder conglomerate bed. For detailed descriptions, see members below. Fossils. The sandy parts of the formation are rich in coal fragments and pieces of coalified wood. The fine-grained parts of the formation are rich in clay ironstone with plant fossils, sideritic silty shale with plant fossils, mostly as impressions, and in situ coalified tree trunks. Plant fossils belong to the ‘Upper Atanikerdluk A’ flora of Heer (1883a, b); fossil insects and ostracods have also been Facing page: Fig. 99. Photogrammetrically measured sections of the incised valley fills of the Quikavsak Formation. A: Longitudinal section of the Tupaasat and Paatuukløften incised valleys in the area around the type section (see Figs 97, 98). B: Cross-section of the Paatuutkløften incised valley from Paatuutkløften (see Fig. 105). Note that the Kangilia Formation is bounded by faults, and that the Atane Formation is also faulted. Most of the Tupaasat Member and the Nuuk Qiterleq Member were removed by erosion prior to deposition of the Paatuutkløften Member. For location of sections, see Figs 2, 40. Modified from Dam (2002; it should be noted that the figure captions for figs 3B and 4 in this paper are switched). described (Koch 1959). At the top of the section at Paatuut, about 5 m below the basalts, a few marine molluscs have been found (Koch 1959). Early Paleocene oysters (Ostrea sp.) have been reported immediately west of Paatuutkløften and east of Nuuk Killeq (Koch 1959). Palynomorphs are common, but only few marine dino - cysts are present. Depositional environment. The Quikavsak Formation represents fluvial to estuarine deposition in a series of faultcontrolled, incised valley systems that formed during two phases of uplift of the Nuussuaq Basin (Dam & Sønderholm 1998; Dam & Nøhr-Hansen 2001; Dam 2002). The mudstone member overlying the basal sandstone member in the type section (Fig. 98) is probably related to a quiescent period between the tectonic events resulting in the development of low-energy depositional (lacustrine) areas within the valleys. Boundaries. The lower boundary of the formation is a major erosional unconformity formed during valley incision, cutting at least 190 m down into the underlying deposits (Figs 99, 109). East of Ataata Kuua, the unconformity separates Turonian – Lower Campanian deltaic sandstones and mudstones of the Atane Formation from the coarse-grained deposits of the Quikavsak Formation. The contact with the underlying Atane Formation is generally easily recognised with the exception of the locality at Quikassaap Kuua where the boundary relationships are somewhat enigmatic (see below under Tupaasat Member). On the west slope of Ataata Kuua and westwards to Ivisaannguit and in the type section, 117
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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
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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
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
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: On Svartenhuk Halvø, on the east s
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
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
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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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