Systematic palaeontology and biostratigraphy of two Early Cretaceous condensed sections from the Barents Sea

Århus, Nils; Kelly, Simon R. A.; Collins, J.S.H.; Sandy, Michael R.

doi:10.3402/polar.v8i2.6811

Cited by 21 publications

(5 citation statements)

References 8 publications

(1 reference statement)

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“…3). The basal boundary of the formation is defined by the BCU (Århus et al, 1990;Lundin and Doré, 1997;Osmundsen and Ebbing, 2008). The unconformity which spans from latest Volgian to earliest Valanginian in age is characterized by an abrupt decrease in gamma ray response and increased velocity upward from the underlying shale-dominated Upper Jurassic Hekkingen Formation (Fig.…”

Section: Offshore Lithostratigraphy and Depositional Systemmentioning

confidence: 99%

“…In the northernmost part of the Bjørnøya Basin, well 7320/3-U-1 probably penetrates S1 where a 30 m thick coarsening upwards mudstone-dominated unit of early Barremian age sharply overlies condensed carbonates of the Klippfisk Formation (Århus et al, 1990). Core descriptions of the published shallow stratigraphic wells 7230/5-U-9, 7231/1-U-1, 7320/3-U-1, 7430/10-U-1, and 7425/9-U-1 have been integrated in this study (Århus et al, 1990;Århus, 1991a;Smelror et al, 1998;Bugge et al, 2002;Langrock et al, 2003).…”

Section: Offshore Datamentioning

confidence: 99%

“…Several studies have discussed the stratigraphic and lateral development of the Lower Cretaceous in Svalbard (e.g. Steel et al, 1978;Nemec et al, 1988;Nemec, 1992;Steel, 1995, 2013;Midtkandal et al, 2007;, and some have invoked a genetic link between the onshore and the offshore depositional systems (Århus et al, 1990;Steel et al, 2000;Midtkandal and Nystuen, 2009;Grundvåg and Olaussen, 2017). However, to date no studies have documented such a link due to a combination of limited data, long-distance correlations, poor age constrains and the lack of preserved Lower Cretaceous strata in parts of the northern Barents Sea.…”

Section: Introductionmentioning

confidence: 99%

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The Lower Cretaceous succession of the northwestern Barents Shelf: Onshore and offshore correlations

Grundvåg

Marín

Kairanov

et al. 2017

Marine and Petroleum Geology

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The Lower Cretaceous succession in the Barents Sea is listed as a potential play model by the Norwegian Petroleum Directorate. Reservoirs may occur in deep to shallow marine clastic wedges located in proximity to palaeo-highs and along basin margins. In addition, shelf-prism-scale clinoforms with high amplitude anomalies in their top-and bottomsets have been reported from reflection seismic but they have never been drilled. In Svalbard, the exposed northwestern corner of the Barents Shelf, Lower Cretaceous strata of shelfal to paralic origin occur, and includes the Rurikfjellet (Valanginian-Hauterivian/lowermost Barremian), Helvetiafjellet (lower Barremian-lower Aptian) and Carolinefjellet formations (lower Aptian-middle Albian). By combining sedimentological outcrop studies and dinocyst analyses with offshore seismic and well ties, this study investigate the link between the onshore strata and the offshore clinoforms. Age-vise, only three (S1-S3) of the seismic sequences defined in the offshore areas correlate to the onshore strata; S1 correspond to the Rurikfjellet Formation, S2 to the Helvetiafjellet Formation and the lower Carolinefjellet Formation, and S3 to the upper Carolinefjellet Formation. Offshore, all three sequences contain generally southward prograding shelf-prism-scale clinoforms. A lower Barremian subaerial unconformity defines the base of the Helvetiafjellet Formation, and its extent indicates that most of the Svalbard platform was exposed and acted as a bypass zone in the early Barremian. Onshore palaeo-current directions is generally towards the SE, roughly consistent with the clinoform accretion-direction towards the S. The local occurrence of a 150 m thick succession of gravity flow deposits transitionally overlain by prodelta slope to delta front deposits in the Rurikfjellet Formation, may indicate that shelfedges also developed in Svalbard. The late Hauterivian age of theses deposits potentially highlights the inferred offlapping nature of the Lower Cretaceous strata as they predate the lower Barremian unconformity, and thus record a hitherto unknown regression in Svalbard. The presence of the lower Barremian subaerial unconformity in Svalbard, the general southeastward palaeo-current directions, and the age-equivalent clinoform-packages south of Svalbard, suggests that the onshore and offshore strata is genetically linked and was part of the same palaeo-drainage system.. , whi.

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Section: Offshore Lithostratigraphy and Depositional Systemmentioning

confidence: 99%

Section: Offshore Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Lower Cretaceous succession of the northwestern Barents Shelf: Onshore and offshore correlations

Grundvåg

Marín

Kairanov

et al. 2017

Marine and Petroleum Geology

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“…In addition, information from the shallow IKU corehole 7425/9-U-1 (Fig. 1B) penetrating the Klippfisk Formation was used (Århus et al, 1990;Århus, 1991;Smelror et al, 1998). Ties were also established to wells in the adjacent Fingerdjupet Subbasin, in particular to well 7321/7-1 (Serck et al, 2017).…”

Section: Databasementioning

confidence: 99%

Characterisation and development of Early Cretaceous shelf platform deposition and faulting in the Hoop area, southwestern Barents Sea—constrained by high-resolution seismic data

Faleide¹,

Midtkandal²,

Corseri³

et al. 2019

NJG

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Regional Early Cretaceous uplift of the northern Barents Sea associated with the High Arctic Large Igneous Province (HALIP) caused the development of the fluvial to open-marine depositional system, terminating in the southwestern Barents Sea. This study has established a new temporal and spatial evolution of the Lower Cretaceous deposits in the Hoop area, in particular the location and age of the intrashelf platform lobe front and subsequent block-faulting. A composite high-resolution 3D and 2.5D P-Cable and conventional 3D seismic dataset image the strata and cross-cutting faults in the Hoop area. The P-Cable data typically have a resolution of 3-7 m in the shallow subsurface, up to four times better than the conventional seismic data, contributing to a new and better mapping hence understanding of the Lower Cretaceous strata and faults. Seismic horizon and facies mapping reveal large-scale clinoforms, with present-day heights of 150-200 m and dips of 0.65-1.13°. The highresolution data furthermore display complex stratigraphic and structural features, such as small-scale clinoforms and numerous faults. The shelf platform succession is block-faulted, and the main Early Cretaceous fault activity thus postdates the arrival of the delta and platform sediments from the northwest. Detailed seismo-stratigraphic ties to the 7324/2-1 (Apollo) and 7325/1-1 (Atlantis) wells, and ties to the adjacent Fingerdjupet Subbasin, document a Barremian age for the shelf platform deposits and an Aptian?-early Albian age for the main faulting event. The faulting was likely initiated in the Aptian, but a hiatus or condensed section above the Barremian strata makes it difficult to constrain the onset of deformation in the Hoop area.

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“…As it is only known from Spitsbergen the new genus, Seductorithyris, does not add any palaeobiogeographic links and can be considered an endemic element to the fauna. Ptilorhynchia is a component of Boreal faunas, but also appears to have had a broad latitudinal distribution and has even been considered bipolar or cosmopolitan (Thomson & Owen 1979;Århus et al 1990;Sandy 1991) and more recently as circum-Pacific (Manceñido 2002;MacFarlan et al 2011). Ptilorhynchia mclachlani sp.…”

Section: Palaeobiogeographic Considerationsmentioning

confidence: 99%

Brachiopods from Late Jurassic—Early Cretaceous hydrocarbon seep deposits, central Spitsbergen, Svalbard

Sandy

Hryniewicz

Hammer

et al. 2014

Zootaxa

Self Cite

714

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Late Jurassic-Early Cretaceous (Late Volgian-latest Ryazanian) rhynchonellate brachiopods are described from eight out of 15 hydrocarbon seep deposits in the Slottsmøya Member of the Agardhfjellet Formation in the Janusfjellet to Knorringfjellet area, central Spitsbergen, Svalbard. The fauna comprises rhynchonellides, terebratulides (terebratuloids and loboidothyridoids) and a terebratellidine. The rhynchonellides include: Pseudomonticlarella varia Smirnova; Ptilorhynchia mclachlani sp. nov.; and Ptilorhynchia obscuricostata Dagys. The terebratulides belong to the terebratuloids: Cyrtothyris? sp.; Cyrtothyris aff. cyrta (Walker); Praelongithyris? aff. borealis Owen; and the loboidothyridoids: Rouillieria cf. michalkowii (Fahrenkohl); Rouillieria aff. ovoides (Sowerby); Rouillieria aff. rasile Smirnova; Uralella? cf. janimaniensis Makridin; Uralella? sp.; Pinaxiothyris campestris? Dagys; Placothyris kegeli? Harper et al.; and Seductorithyris septemtrionalis gen. et sp. nov. The terebratellidine Zittelina? sp. is also present. Age determinations for all but one of the brachiopod-bearing seeps are based on associated ammonites. Five of the seep carbonates have yielded Lingularia similis?, and it is the only brachiopod species recorded from two of the seeps. Other benthic invertebrate taxa occurring in the seeps include bivalves, gastropods, echinoderms, sponges, and serpulid and non-serpulid worm tubes. The brachiopod fauna has a strong Boreal palaeobiogeographic signature. Collectively, the Spitsbergen seep rhynchonellate brachiopods exhibit high species richness and low abundance (<100 specimens from 8 seeps). This contrasts markedly with other Palaeozoic-Mesozoic brachiopod-dominated seep limestones where brachiopods are of low diversity (typically monospecific) with a super-abundance of individuals. The shallow water environmental setting for the Spitsbergen seeps supported a diverse shelf fauna, compared to enigmatic Palaeozoic-Mesozoic brachiopod-dominated seeps.

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Systematic palaeontology and biostratigraphy of two Early Cretaceous condensed sections from the Barents Sea

Cited by 21 publications

References 8 publications

The Lower Cretaceous succession of the northwestern Barents Shelf: Onshore and offshore correlations

The Lower Cretaceous succession of the northwestern Barents Shelf: Onshore and offshore correlations

Characterisation and development of Early Cretaceous shelf platform deposition and faulting in the Hoop area, southwestern Barents Sea—constrained by high-resolution seismic data

Brachiopods from Late Jurassic—Early Cretaceous hydrocarbon seep deposits, central Spitsbergen, Svalbard

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