Depositional conditions of the Bathonian to Hauterivian Janusfjellet Subgroup, Spitsbergen

Dypvik, Henning; Nagy, Jenő; Eikeland, Tor Arne; Backer‐Owe, K.; Johansen, Halvor

doi:10.1016/0037-0738(91)90123-u

Cited by 69 publications

(92 citation statements)

References 9 publications

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“…Callovian-Oxfordian TOC-rich deposits have been reported for the Late Callovian-Early Oxfordian (Price and Gröcke, 2002) and one record of marine black shales deposited from the Late Bathonian to the Volgian (Bausch et al, 1998). Other descriptions of Oxfordian organic-rich deposits come from Nepal (Gradstein et al, 1991) and Svalbard (Dypvik et al, 1991;Reolid et al, 2010). Therefore, the records of organic-rich Oxfordian sediments are rare, and appear to represent local to regional processes rather than a condition of the global oceans (Pearce et al, 2005).…”

Section: Interpretation Of Stratigraphic Geochemical Fluctuationsmentioning

confidence: 99%

Comparison of benthic foraminifera and geochemical proxies in shelf deposits from the Upper Jurassic of the Prebetic (southern Spain)

Reolid

Martı́nez-Ruiz

2013

Journal of Iberian Geology

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Comparison of the stratigraphic distribution of major and trace elements, used as proxies for palaeoproductivity and redox conditions, and benthic foraminifera from Oxfordian shelf deposits of the External Prebetic (Betic Cordillera, South Spain) allows us to recognise two sedimentary cycles, both characterised by initial enhanced productivity and decreasing oxygen availability in the seabottom, and a subsequent decreasing productivity with a recovering in oxygenation during the second half of each cycle. Dysoxic conditions appear to coincide with maximums in marine surface productivity, thus suggesting that oxygen depletion may be linked to greater consumption rather than restricted circulation. The boundary between the two cycles is characterised by low contents of redox-sensitive elements and lower TOC content and Sr/Al, P/Ti, Ca/Al and Ba/Al ratios, indicating well oxygenated sea-bottom, lower productivity and lower organic matter accumulation. The geochemical proxies have also revealed as a valuable tool for interpreting the stratigraphic fluctuations of benthic foraminiferal assemblages, as well as for evaluating the palaeoecology of the main genera. Spirillina is adversely influenced by oxygen depletion independently of food availability. Ophthalmidium presents very good correspondence with palaeoproductivity fluctuations, and tolerated low oxygen levels in the sediment-water interface. Reophax was an opportunist that proliferated after adverse conditions when oxygenation and food availability were limiting factors. The variability in the microhabitat depth inside the sediment of Reophax favoured adaptation to adverse conditions. Lenticulina shows behaviour similar to Reophax. Finally, Ammobaculites shows a low degree of relation with the palaeoproductivity proxies, and is intolerant with respect to low oxygen values in shallow infaunal microhabitats.

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Section: Interpretation Of Stratigraphic Geochemical Fluctuationsmentioning

confidence: 99%

Comparison of benthic foraminifera and geochemical proxies in shelf deposits from the Upper Jurassic of the Prebetic (southern Spain)

Reolid

Martı́nez-Ruiz

2013

Journal of Iberian Geology

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“…In this context, the present study will significantly contribute to the knowledge required for the understanding of the petroleum system of the unexplored part of the Barents Sea. Oppdalen, Lardyfjellet, Oppdalssåta and Slottsmøya, from bottom to top (Dypvik et al, 1991).…”

mentioning

confidence: 99%

Thermal maturity, hydrocarbon potential and kerogen type of some Triassic–Lower Cretaceous sediments from the SW Barents Sea and Svalbard

Abay

Karlsen

Pedersen

et al. 2017

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Rock-Eval and total organic carbon (TOC) analyses of 144 samples representing Triassic–Lower Cretaceous intervals from the SW Barents Sea (the Svalis Dome, the Nordkapp and Hammerfest basins, and the Bjarmeland Platform) and Svalbard demonstrate lateral variations in source rock properties. Good to excellent source rocks are present in the Lower–Middle Triassic Botneheia and Steinkobbe, and Upper Jurassic Hekkingen formations, 1 – 7 wt% and 6 – 19 wt% TOC, respectively. Hydrogen indices of 298 – 609 mg HC/g TOC in the Botneheia Formation from Svalbard, and 197 – 540 mg HC/g TOC in the Steinkobbe Formation of Svalis Dome suggest Type II (oil-prone) and Type II/III (oil/gas-prone) kerogens, respectively. The Kobbe Formation (Botneheia/Steinkobbe-equivalent) is organic-lean and generally gas-prone (Type III kerogen) on the Bjarmeland Platform and in the Nordkapp Basin, and is a good source rock with Type III/II kerogen in the Hammerfest Basin. In the investigated wells, the Hekkingen Formation is more oil-prone on the Bjarmeland Platform than in the Nordkapp Basin, while Lower Cretaceous samples have poor potential for oil. Upper Triassic samples show potential mainly for gas; however, coal/coaly-shale samples in well 7430/07-U-01 (Bjarmeland Platform) are oil/gas-prone. Most samples analysed are immature to early mature; thus, the variation in petroleum potential and kerogen type is a function of organic facies rather than maturity levels.

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“…Large, Late Palaeozoic lineaments of the Billefjorden and Lomfjorden fault complexes were not reactivated during the Late Mesozoic (Haremo et al, 1990;Dypvik et al, 1991;McCann & Dallmann, 1996).…”

Section: Implications For the Wandel Sea Basinmentioning

confidence: 93%

3D restoration of a Cretaceous rift basin in Kilen, eastern North Greenland

Svennevig¹,

Guarnieri²,

Stemmerik³

2017

NJG

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The semi-nunatak Kilen is a key area to understand the setting of the Cretaceous sedimentary basin in eastern North Greenland. The basin geometry has been obscured by later N-S compression and inversion of presumable Palaeocene-Eocene age. A 3D restoration of the Cretaceous basin is presented based on new oblique photogrammetry and field data combined with published data. The 3D restoration focuses on the main faults and a well constrained mid-Cretaceous horizon. The restoration shows that the horizon was offset down-to-the-ENE by several NNW-SSE-striking normal faults and highlights the similarity of the pre-folding basin to a normal rifted margin. The northwestern part of the restored area comprises five fault blocks divided by four NNW-SSE-striking normal faults dipping to the ENE, whereas the southeastern part consists of a single large fault block deformed by minor antithetic faulting. Minimum offsets on exposed normal faults are between 780 and 1200 m, and the fault blocks are between 1.5 and more than 10 km in width. The restoration and interpretation of the Cretaceous basin at Kilen as extensional opens for a similar interpretation for NNW-SSE-oriented faults affecting Mesozoic sediments elsewhere in the Wandel Sea Basin which were previously interpreted as having formed in a strike-slip setting. The basin restored at Kilen has several similarities to basins on the southwestern Barents Sea margin, especially the Bjørnøya Basin, located just 100-200 km east of Kilen in pre-North Atlantic opening times. The two basins were separated by the Stappen High and the basin at Kilen could be the western part of a successful rift that eventually resulted in the opening of the North Atlantic.

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Depositional conditions of the Bathonian to Hauterivian Janusfjellet Subgroup, Spitsbergen

Cited by 69 publications

References 9 publications

Comparison of benthic foraminifera and geochemical proxies in shelf deposits from the Upper Jurassic of the Prebetic (southern Spain)

Comparison of benthic foraminifera and geochemical proxies in shelf deposits from the Upper Jurassic of the Prebetic (southern Spain)

Thermal maturity, hydrocarbon potential and kerogen type of some Triassic–Lower Cretaceous sediments from the SW Barents Sea and Svalbard

3D restoration of a Cretaceous rift basin in Kilen, eastern North Greenland

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