scholarly journals Lithostratigraphy and structure of the North Greenland fold belt in Nansen Land

1987 ◽  
Vol 133 ◽  
pp. 99-106
Author(s):  
H.-J Bengaard ◽  
N.C Davis ◽  
J.D Friderichsen ◽  
A.K Higgins
Keyword(s):  
Deep Water ◽  
Lower Cambrian ◽  
Field Work ◽  
Fold Belt ◽  
The North ◽  
Dyke Intrusion ◽  
Thickness Variations ◽  
North Greenland

Field work in Nansen Land and adjacent areas in 1985 has largely confirmed the provisional lithostratigraphy of the Paradisfjeld Group and Polkorridoren Group previously established; both are Lower Cambrian deep-water sequences. Some units of the Polkorridoren Group show marked thickness variations. Two major phases of Ellesmerian (Devonian-Carboniferous) deformation are recognised, whereas Eurekan (CretaceousTertiary) events are limited to relatively minor structures, and several phases of dyke intrusion.

scholarly journals The North Greenland fold belt in eastern Nansen Land

1985 ◽  
Vol 126 ◽  
pp. 69-78
Author(s):  
J.D Friderichsen ◽  
H.-J Bengaard
Keyword(s):  
Lower Cambrian ◽  
Upper Cretaceous ◽  
Field Work ◽  
Strike Slip ◽  
Fold Belt ◽  
Clastic Rocks ◽  
The North ◽  
Major Strike ◽  
East West ◽  
Strike Slip Movement

Field work in 1984 shows that Nansen Land consists of clastic rocks of the carbonaceous Paradisfjeld Group and terrigeneous rocks of the Polkorridoren Group; both are lower Cambrian in age and deposited in a slope and fan environment. Two major Ellesmerian (Devonian to Carboniferous) phases of deformation gave rise to east-west trending folds and schistosities. Three phases of Eurekan (upper Cretaceous to Tertiary) deformation, associated with dyke intrusion, are recognised. The second of these may be related to transpression on the Harder Fjord fault zone, though no major strike-slip movement seems to have taken place.

scholarly journals Late Silurian and early Devonian graptolites from North Greenland

1974 ◽  
Vol 65 ◽  
pp. 11-13
Author(s):  
W.B.N Berry ◽  
A.J Boucot ◽  
P.R Dawes ◽  
J.S Peel
Keyword(s):  
Field Work ◽  
Fold Belt ◽  
The South ◽  
Early Devonian ◽  
The North ◽  
The Subject ◽  
North Greenland

The precise age of the youngest part of the geosynclinal fill of the North Greenland fold belt has been the subject of important discussion, particularly with regard to the problem of dating the Palaeozoic diastrophism (Kerr, 1967; Dawes, 1971). Since Lauge Koch's field work between 1916 and 1923 it has been known that strata bearing Monograptus priodon were involved in the folding (Koch, 1920), indicating the presence of Silurian of Llandovery-Wenlock age. In addition, Poulsen (1934) identified Cyrtograptus cf. C. multiramus and Monograptus bohemicus in collections made by Koch from unfolded shales on the platform, to the south of the fold belt, which demonstrated that the section included Wenlock and early Ludlow strata.

scholarly journals Structural geology of central Peary Land, North Greenland

1979 ◽  
Vol 88 ◽  
pp. 55-62
Author(s):  
S.A.S Pedersen
Keyword(s):  
Field Work ◽  
Aerial Photographs ◽  
Laboratory Studies ◽  
Fold Belt ◽  
Ice Caps ◽  
The North ◽  
Lower Palaeozoic ◽  
Southern Border ◽  
Structural Aspects ◽  
North Greenland

The region investigated in 1978 between Jørgen Brønlund Fjord - Øvre Midsommersø in the south and Frederick E. Hyde Fjord in the north consists of c. 1½ km thiekness of Lower Palaeozoic carbonates overlain by an up to 1 km thick series of Silurian flysch (Christie & Peel, 1977). In general the region is part of the Palaeozoic platform that ean be divided into three major E-W trending physiographic belts: a southern belt where the carbonates form plateaus incised by steep valleys, a central belt consisting of characteristic conical mountains marked by concentric terraces of resistant sandstone beds in the flyseh (Dawes, 1976, fig. 249), and in the fold belt to the north the mountains rise up to altitudes of 1000-1500 m and are covered by extensive ice caps (fig. 17). The southern border of the region, the Øvre Midsommersø - Jørgen Brønlund Fjord area, was mapped by Jepsen (1971) while the Lower Palaeozoic stratigraphy in the central part af the region has been established by Christie & Peel (1977) at Børglum Elv. Some structural aspects af the gealogy at Frederick E. Hyde Fjord are briefly described by Dawes (1971) and Dawes & Soper (1973). Prior to the field work a comprehensive photogeological interpretation was carried out on vertical aerial photographs (seale c. 1:60000) and compiled on six uneontoured l: 100000 photomosaic maps. The 1978 field work and laboratory studies using a Kern PG 2 photogrammetric instrument form the first detailed study of the fold belt margin. For descriptive purposes the region investigated in 1978 has been subdivided into seven areas (fig. 17), the main struetural features of which form the basis of this report.

scholarly journals Volcanic centres between Frigg Fjord and Midtkap, eastern North Greenland

1981 ◽  
Vol 106 ◽  
pp. 69-75
Author(s):  
I Parsons
Keyword(s):  
Fault Zone ◽  
Fold Belt ◽  
The South ◽  
The North ◽  
Rock Types ◽  
South West ◽  
North Greenland

A series of smal! volcanic centres cut Ordovician turbidites of Formation A in the southem part of Johannes V. Jensen Land between Midtkap and Frigg Fjord (Map 2). Their general location and main rock types were described by Soper et al. (1980) and their nomenclature is adopted here for fig. 22 with the addition of the small pipe B2. A further small intrusion, south-west of Frigg Fjord, was described by Pedersen (1980). The centres lie 5-10 km south of, and parallel to, the important Harder Fjord fault zone (fig. 22) which traverses the southern part of the North Greenland fold belt and shows substantial downthrow to the south (Higgins et al., this report).

scholarly journals Notes on some Lower Palaeozoic to Tertiary faunas from eastern North Greenland

1974 ◽  
Vol 65 ◽  
pp. 18-23
Author(s):  
J.S Peel ◽  
P.R Dawes ◽  
J.C Troelsen
Keyword(s):  
Field Work ◽  
The South ◽  
Initial Field ◽  
North East ◽  
The North ◽  
Lower Palaeozoic ◽  
North Greenland

The north-east 'corner' of Greenland is geologically probably the least known region in North Greenland. Various expeditions have visited the coastal parts but geological detail, particularly faunal information, has remained surprisingly scarce. Initial field work by Koch (1923, 1925) and Troelsen (1949a, b, 1950) showed that a Precambrian to Silurian section - unfolded in the south, folded in the north - was unconformably overlain by a Carboniferous to Tertiary section, now referred to as the Wandel Sea basin (Dawes & Soper, 1973).

scholarly journals Structural and stratigraphic framework of the North Greenland fold belt in Johannes V. Jensen Land, Peary Land

1979 ◽  
Vol 93 ◽  
pp. 1-40
Author(s):  
P.R Dawes ◽  
N.J Soper
Keyword(s):  
Northern Coast ◽  
Structural Detail ◽  
Fold Belt ◽  
The North ◽  
Stratigraphic Framework ◽  
Mineral Assemblages ◽  
Lower Palaeozoic ◽  
Main Deformation ◽  
Basin Margin ◽  
North Greenland

Structural and stratigraphic detaiIs collected during reconnaissance fjeld work in northern Peary Land in 1969 are presented to substantiate the rather general accounts of the North Greenland fold belt hitherto published. The structural detail, largely in the form of graphic profiles sketched in the fieid, is referred to a structural frarnework in which three main deformation phases are recognised. The fold belt displays a roughly E-W zonation based on the progressive northerly increasing intensity of deformation and metamorphic effects that culminate along the northern coast in amphibolite-facies mineral assemblages in complexly folded schist lithologies. It is stressed that, while the conspicuous structural character of the fold belt is its northerly vergence seen particularly in the northernmost part, the detailed structural make-up of the fold belt is complex. Fold style and vergence vary considerably and the southern margin of the fold belt, autochthonous with respect to the platform, is characterised by south-verging folds. Some stratigraphical data is presented particularly from the Lower Palaeozoic sequence at the southern part of the fold belt that iIIustrates the basinal clastic facies at the sheIf-basin margin.

scholarly journals Lower Cambrian fossils from Nyeboe Land, North Greenland fold belt

1974 ◽  
Vol 65 ◽  
pp. 17-17
Author(s):  
J.S Peel
Keyword(s):  
Lower Cambrian ◽  
Fault System ◽  
Fold Belt ◽  
Major Strike ◽  
North Greenland

Reconnaissance mapping and collecting was carried out in the Robeson Channel area of North Greenland during 1965-66 by P. R. Dawes and J. H. Allaart as part of Operation Grant Land. Within the fold belt in Nyeboe Land a major strike fault system separates a northern unit of limestones, slates and sandstones from a less-severely deformed calcareous greywacke and shale sequence of probable Silurian age.

scholarly journals Ordovician graptolite biostratigraphy in North Greenland

1989 ◽  
Vol 144 ◽  
pp. 17-33
Author(s):  
M Bjerreskov
Keyword(s):  
Deep Water ◽  
Canadian Cordillera ◽  
Large Collection ◽  
Arctic Canada ◽  
The North ◽  
Water Trough ◽  
Relationship Of ◽  
The Relationship ◽  
East West ◽  
North Greenland

Up to 500 m of black-bedded cherts and mudstones with thin turbidites and thick local beds of redeposited limestone and chert conglomerates were deposited during the Ordovician in North Greenland, along the southern margin of an east-west trending deep-water trough forming a continuation of the Frank Jinian Basin of Arctic Canada. A large collection of Ordovician graptolites has recently been obtained from this clastic sequence. The graptolite fauna, not collected in continuous sections, compares particularly well with the fauna from the Canadian Cordillera and for the most part is interpreted in terms of the established biozones from that area. The faunas are also correlated with the Australian zonal sequences. In North Greenland neither the Cambrian-Ordovician boundary nor the Ordovieian-Silurian boundary ean be precisely demarcated by graptolites. The folIowing graptolite biozones are represented: Anisograptus, Adelograptus & Clonograptus, T. approximalus, P. frulicosus, D. bifidus, I. victoriae lunatus, ? T. victoriae victoriae, ? l. victoriae maximus, Oncograptus, P. tentaculatus, ? 'D.' decoratus, ? H. lereliusculus, N. gracilis, C. bicornis, ? O. amplexicaulis, O. quadrimucronatus, D. ornatus and? P. pacificus. The relationship of the North Grecnland graptolites to the Ordovician 'Pacific faunal realm' and oceanic graptolite biofacies is briefly discussed.

scholarly journals Preliminary Rb-Sr age determinations from the North Greenland fold belt, Johannes V Jensen Land, with comments on the metamorphic grade

1981 ◽  
Vol 106 ◽  
pp. 77-84
Author(s):  
N Springer
Keyword(s):  
Sedimentary Rocks ◽  
Metamorphic Grade ◽  
Low Grade ◽  
Fold Belt ◽  
Isotopic Dating ◽  
Field Mapping ◽  
Sedimentary Structures ◽  
The North ◽  
North Greenland ◽  
Age Determinations

This report presents the first Rb-Sr age determinations obtained on low-grade metasediments within the eastern part of the North Greenland fold belt. Samples were collected during the 1979 field mapping in eastem Johannes V. Jensen Land, the results ofwhich have been published elsewhere (Soper et al., 1980). Material selected for this study was taken from moderately folded rocks of the Polkorridoren Group and from the northem part of the fold belt where deformation is intense and sedimentary structures are rarely preserved (fig. 23). The principles and methods of isotopic dating of sedimentary rocks applied in this study have been treated in a recent paper by Clauer (1979).

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