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

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1600 600 Ikorfat), the basal sediments are breccias with large clasts comprising both gneiss with weathered feldspars and carbonaceous mudstones (Fig. 25A). At Ikorfat, breccias with angular gneiss clasts are overlain by a conglomerate bed, a few metres thick, comprising subangular clasts of quartz and intensely kaolinised feldspars. The diamictites and poorly sorted conglomerates are not seen above the basement highs. The poorly sorted, coarsegrained deposits are overlain by thin conglomerates, cross-bedded, locally channellised, coarse-grained sandstones, mudstones and thin discontinuous coal beds (Fig. 25). Root horizons are frequent and the mudstones commonly contain abundant comminuted plant debris (Fig. 25; Schiener 1977; Pulvertaft 1979; Midtgaard 1996b). Fine-grained sandstones with wave-ripples forming coarsening-upward successions occur in the upper part of the formation and are common in the Ikorfat area. The topmost bed of the Kome Formation is a bleached, crumbly mudstone with abundant root-casts overlain by a coal bed (Fig. 25C; Midtgaard 1996b). 2 km Quaternary cover Vaigat Formation Vaigat Formation Tunoqqu Member Kome Formation 200 Sarfâgfik Precambrian 70°40′ Kuutsiaq 600 400 Sarfaaffiip Kuussinersua 400 200 14 8 15 11 Ice Sea/lake Fault Inferred base of Cretaceous sediments Abandoned settlement Majorallattarfik Kûk 800 Kuuk 17 15 800 1000 1200 Tuapassuit 1000 1400 52°25′ 70°35′ 1000 Fig. 21. Geological map of the area around Kuuk (from Pulvertaft 1979). Majorallat - tarfik is the type locality of the Kome Formation. The sediments overlie weathered basement and are well exposed. For location, see Fig. 2. 38
In the Kuuk area, the sediments overlying the coarsegrained, basal deposits consist of three facies associations: A, B and C (Figs 24, 27, 28). Association A is dominant and consists mainly of trough cross-bedded, erosionally based sandstones in shoe-string or irregular tabular bodies up to 5 m thick (Figs 24, 28). The sandstones are coarse-grained, often gravelly, with angular clasts, and is poorly sorted. It contains slightly to moderately kaolinised feldspars and kaolinite cement. Fragments of coalified wood and fine-grained plant debris are common. The orientation of shoe-string bodies and dip direction of foresets indicates transport from the south-east. The sandstones alternate with dark laminated silty mudstones containing much coalified plant debris, thin lenses of lustrous, coalified, woody tissue and thin coal seams (Fig. 24; Pulvertaft 1979). Association B consists of distinctive coarsening-upward successions of mudstones, cross-laminated siltstones, sandstones and locally thin layers of gravelly sandstones (Figs 24, 27). Association C is dominated by tabular cross-bedded, medium-grained, moderately well-sorted subarkosic sandstones with pebble lags of quartz or chert. Comminuted coalified plant debris and mica are common in the sandstones. Foresets dips are to the north-west. Cross-laminated, fine-grained 53°00’ 52°45’ 2 km 30 25 Ikorfat 25 Kussinikassaq Angiarsuit Nipitartukassaat Ujarattoorsuup Killia Ujarattoorsuaq Ujarattoorsuup Kangilia Siorartartarfik 30 D 20 B Talerua A C 70°45’ J.P.J. Ravn Kløft Slibestensfjeldet Ikorfat Qaqqarsui Aarrusap Kussinersua Airport 28 Qaarsut Vesterfjeld Qaarsut Kussinersuat Østerfjeld Quaternary cover Vaigat Formation Vaigat Formation Tunoqqu Member Intrusion Eqalulik Formation Itilli Formation Atane Formation Kingittoq Member Atane Formation Ravn Kløft Member Atane Formation Undivided, west of Ikorfat Slibestensfjeldet Formation Umiivik Member Kome Formation Precambrian Ice Sea/lake Fault Strike and dip of strata Fig. 22. Detailed geological map of the north coast of Nuussuaq, from Qaarsut to Ikorfat. The locations of the four sedimentological logs (A–D) in Fig. 25 are indicated. Contour interval 200 m. Modified from Rosenkrantz et al. (1974) and Midtgaard (1996b). For location, see Fig. 2. 39
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
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: Fig. 20. View from Uummannaq toward
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 and 58: 12’ 09’ 15’ 06’ 03’ Saqqa
Page 59 and 60: m 0 GGU 247801 200 400 247815 ★
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
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 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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