NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Stemmerik, L., Dalhoff, F., Larsen, B. D., Lyck, J., Mathiesen, A., & Nilsson, I. (1998). Wandel Sea Basin, eastern North Greenland. Geology of Greenland Survey Bulletin, 180, 55-62. https://doi.org/10.34194/ggub.v180.5086 _______________ The Wandel Sea Basin in eastern North Greenland is the northernmost of a series of fault-bounded Late Palaeozoic – Early Tertiary basins exposed along the eastern and northern margin of Greenland (Fig. 1). The basin and the surrounding shelf areas are located in a geologically complex region at the junction between the N–S trending Caledonian fold belt in East Greenland and the E–W trending Ellesmerian fold belt in North Greenland, and along the zone of later, Tertiary, continental break-up. The Wandel Sea Basin started to develop during the Carboniferous as a result of extension and rifting between Greenland and Norway, and Greenland and Spitsbergen (Håkansson & Stemmerik 1989), and was an area of accumulation during the Early Carboniferous – Early Tertiary period. Two main epochs of basin evolution have been recognised during previous studies of the basin fill: an early (late Palaeozoic – early Triassic) epoch characterised by a fairly simple system of grabens and half-grabens, and a late (Mesozoic) epoch dominated by strike-slip movements (Håkansson & Stemmerik 1989). The Mesozoic epoch only influenced the northern part of the basin, north of the Trolle Land fault zone (Fig. 1). Thus the northern and southern parts of the basin have very different structural and depositional histories, and accordingly different thermal histories and hydrocarbon potential. This paper summarises the results of a project supported by Energy Research Program (EFP-94), the purpose of which was to model the Wandel Sea Basin with special emphasis on hydrocarbon potential and late uplift history, and to provide biostratigraphic and sedimentological data that could improve correlation with Svalbard and the Barents Sea. It is mainly based on material collected during field work in Holm Land and Amdrup Land in the south-eastern part of the Wandel Sea Basin during 1993–1995 with additional data from eastern Peary Land (Stemmerik et al. 1996). Petroleum related field studies have concentrated on detailed sedimentological and biostratigraphic studies of the Carboniferous–Permian Sortebakker, Kap Jungersen, Foldedal and Kim Fjelde Formations in Holm Land and Amdrup Land (Fig. 2; Døssing 1995; Stemmerik 1996; Stemmerik et al. 1997). They were supplemented by a structural study of northern Amdrup Land in order to improve the understanding of the eastward extension of the Trolle Land fault system and possibly predict its influence in the shelf areas (Stemmerik et al. 1995a; Larsen 1996). Furthermore, samples for thermal maturity analysis and biostratigraphy were collected from the Mesozoic of Kap Rigsdagen and the Tertiary of Prinsesse Thyra Ø (Fig. 1).
I., Davydov, V. I.: Sequence stratigraphy of the inner Finnmark carbonate platform (Upper Carboniferous-Permian), Barents Sea -correlation between well 7128/6-1 and the shallow IKU cores.A new set of descriptions has been prepared for five of the IKU cores, a series of shallow stratigraphic cores penetrating the Upper Carboniferous-Permian Finnmark carbonate platform succession near its southern erosional truncation against the Norwegian mainland. These data are compared with core descriptions previously published from the thicker 'stratigraphic reference section' of the exploration well 7128/6-1 (Ehrenberg et al. 1998a). New fusulinid datings from 7128/6-1 are correlated with existing fusulinid data from the IKU cores to provide a consistent time-stratigraphic framework for landward correlation of depositional sequences previously defined in the 7128/6-1 reference section. These correlations reveal a limited two-dimensional image of depositional sequence geometry for the inner platform. Of the 7 major sequences previously defined in the Kasimovian through Upper Permian section of well 7128/6-1, 2 sequences are suggested to pinch out before reaching the IKU cores, while the remaining 5 sequences thin by 32-63% and show landward loss of lithologic resolution of systems tracts. Thinning is probably accomplished by increasing magnitude and frequency of hiatuses both within and bounding each sequence, reflecting gradual uplift of the Norwegian mainland and seaward tilting of the platform throughout the depositional history. Landward changes in lithology, dolomitization, and porosity are relatively subtle, suggesting that platform deposition extended well beyond the present southern termination of carbonate strata. S. N.
New fusulinid data from the Kolosseum locality, central Spitsbergen, show the process of fusulinid evolution in transitional Middle to Upper Carboniferous beds of the Arctic region. This well-preserved fusulinid fauna provides a clear understanding of the nature of Moscovian-Kasimovian fusulinid evolution; particularly in the Arctic region. Fusulinid assemblages in the Moscovian/Kasimovian boundary beds in Spitsbergen show a predominance of representatives of the Protriticites-Montiparus-Rauserites lineage. Representatives of the Praeobsoletes-Obsoletes-Triticites lineage in Spitsbergen are very rare and occur later than in the stratotype region, the Russian Platform. Four fusulinid zones similar to zones in the stratotype area are defined upwards: Fusulinella bocki Zone, Protriticites ex. gr. ovatus-Quasifusulinoides quasifusulinoides Zone, Protriticites pseudomontiparus-Obsoletes obsoletus Zone and Montiparus montiparus Zone, respectively. Precise correlation of the Moscovian/Kasimovian transition of Spitsbergen to adjacent areas (Northeast Greenland and Canadian Arctic) as well as with the Moscovian-Kasimovian of the region of the Moscow basin, Spain, and Carnic Alps is suggested. The Moscovian/Kasimovian boundary of Eurasia is approximately correlative with the Middle Desmoinesian (base of DS-3 fusulinid zone of Wilde 1990) of North America. Data from Spitsbergen are of great importance for resolving the problem of Middle/Upper Carboniferous boundary recognition regarding fusulinid phylogenies.
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