Victoria Sjøholt Engelschiøn

• Engelschiøn, Victoria Sjøholt; Roberts, Aubrey Jane; With, Ruben & Hammer, Øyvind (2023). Exceptional X-Ray contrast: Radiography imaging of a Middle Triassic mixosaurid from Svalbard. PLOS ONE. ISSN 1932-6203. 18(5). doi: 10.1371/journal.pone.0285939.
• Engelschiøn, Victoria Sjøholt; Bernhardsen, Sofie; Wesenlund, Fredrik; Hammer, Øyvind; Hurum, Jørn Harald & Mørk, Atle (2023). Bivalve beds reveal rapid changes in ocean oxygenation in the Boreal Middle Triassic – a case study from Svalbard, Norway. Norwegian Journal of Geology. ISSN 2387-5844. 103. doi: 10.17850/njg103-2-1. Full text in Research Archive Show summary

  A fossil-rich interval in the organic-rich marine black mudstone of the Middle Triassic Botneheia Formation on eastern Svalbard was logged in high-resolution on an extremely well exposed section with emphasis on bivalve beds, taphonomic features, trace fossils and oxygenation proxies. The size distribution, fragmentation, articulation and orientation of three bivalve beds of the epifaunal flat clam Daonella were analysed. The logged section was studied for the recurrent occurrences of trace fossils and bivalve beds, and size distribution of framboidal pyrite. Daonella is most common in the shaly interval, while other taxa seem to outcompete Daonella in the siltier intervals. The comparison of fossil and sedimentological data with geochemical proxies for oxygenation revealed that the bivalve beds formed under dysoxic, conditions and due to low sedimentation rates and winnowing are not mass-mortality assemblages as previously suggested. The deposition on the sea floor was interrupted by anoxic intervals without benthic life. Recurrent beds containing the trace fossil Thalassinoides, however, show that oxygen levels fluctuated. The combination of water currents and oxygen fluctuations is a key to understanding why the black shales of the Botneheia Formation are so rich in benthic fossils

• Kear, Benjamin P.; Engelschiøn, Victoria Sjøholt; Hammer, Øyvind; Roberts, Aubrey Jane & Hurum, Jørn Harald (2023). Earliest Triassic ichthyosaur fossils push back oceanic reptile origins. Current Biology. ISSN 0960-9822. 33(5), p. R178–R179. doi: 10.1016/j.cub.2022.12.053.
• Roberts, Aubrey Jane; Engelschiøn, Victoria Sjøholt & Hurum, Jørn Harald (2022). First three-dimensional skull of the Middle Triassic mixosaurid ichthyosaur Phalarodon fraasi from Svalbard, Norway. Acta Palaeontologica Polonica. ISSN 0567-7920. 67(1), p. 51–62. doi: 10.4202/app.00915.2021. Full text in Research Archive
• Wesenlund, Fredrik; Grundvåg, Sten-Andreas; Engelschiøn, Victoria Sjøholt; Thieβen, Olaf & Pedersen, Jon Halvard (2022). Multi-elemental chemostratigraphy of Triassic mudstones in eastern Svalbard: implications for source rock formation in front of the World’s largest delta plain. The Depositional Record. ISSN 2055-4877. 8(2), p. 718–753. doi: 10.1002/dep2.182. Full text in Research Archive Show summary

  The Triassic Boreal Ocean was a shallow epicontinental basin and the sink of the World’s largest delta plain known to date. Nutrient and freshwater supply from this delta plain have been considered as important causes for high marine productivity and water mass stratification, forming Middle Triassic oil-prone source rocks. Recent studies of these source rocks attribute marine upwelling and a productivity-induced oxygen minimum zone as important factors. A multi-elemental chemostratigraphic study of a Spathian–Carnian marine mudstone succession exposed on Edgeøya, eastern Svalbard was performed to investigate their formation. This includes 89 samples from three localities. In total, 34 elements ranging from carbon to uranium were acquired using combustion and X-ray fluorescence analyses. The goal is to provide a correlation framework and infer the role of primary productivity, benthic redox and water mass restriction on organic matter accumulation and source rock formation. The Spathian Vendomdalen Member suggests deposition during intermittent euxinic bottom waters and low productivity, corresponding with a reported deep thermocline in the Triassic Boreal Ocean that obstructed upwelling and nutrient supply. The lower Anisian lower–middle Muen Member shows negligible enrichment in redox-sensitive elements but in situ phosphate-nodules, consistent with a change towards enhanced upwelling and moderate primary productivity. High productivity and intense phosphogenesis took place first in the middle Anisian upper Muen Member and are linked with basin-wide upwelling. Productivity, phosphate, and redox proxies are strongly elevated and correlated in the overlying upper Anisian–Ladinian Blanknuten Member. In the southern Barents Sea, the pro-deltaic environment of the emerging Triassic Boreal Ocean delta system (Ladinian–Carnian Snadd Formation) had terminated these conditions. The regressive upper Ladinian upper Blanknuten Member returned to intermittent benthic euxinia due to the shallowing sea level. The Carnian Tschermakfjellet Formation (Snadd Formation facies equivalent) exemplifies the dominance of the prograding Triassic Boreal Ocean delta system, terminating the conditions for oil-prone source rock formation in the Svalbard area

• Wesenlund, Fredrik; Grundvåg, Sten-Andreas; Engelschiøn, Victoria Sjøholt; Thießen, Olaf & Pedersen, Jon Halvard (2021). Linking facies variations, organic carbon richness and bulk bitumen content – A case study of the organic-rich Middle Triassic shales from eastern Svalbard. Marine and Petroleum Geology. ISSN 0264-8172. 132. doi: 10.1016/j.marpetgeo.2021.105168. Full text in Research Archive Show summary

  The organic-rich shales of the Middle Triassic Botneheia Formation in Svalbard and its correlative units offshore are considered important source rock intervals for oil and gas generation in the Norwegian Barents Shelf region. Detailed investigation of these intervals is essential to better understand the intra source rock variations and thus to improve exploration models. As source rocks are rarely cored during exploration campaigns, outcrop studies of analogue source rocks onshore Svalbard are of great importance for gaining a comprehensive understanding of the Triassic petroleum system offshore. This integrated sedimentological and geochemical study of the Botneheia Formation investigates the intricate relationship between mudstone facies, total sulfur, total organic/inorganic carbon, and the absolute and relative abundance of bulk bitumen content. Both the Muen Member (Anisian) and the overlying Blanknuten Member (mostly Ladinian) of the Botneheia Formation were densely sampled and analyzed from three outcrop localities on Edgeøya, eastern Svalbard. The results show that total sulfur, total organic carbon, bitumen richness, and relative and absolute aromatic hydrocarbon content increase from bioturbated, gray-colored shales in the lower to middle Muen Member upwards into non-bioturbated, phosphogenic black shales in the middle part of the Blanknuten Member. From here, organic carbon and bulk bitumen richness subsequently decrease upwards in concert with the occurrence of bioturbated, calcareous mudstones and impure limestones towards the top of the Blanknuten Member. Optical vitrinite reflectance variations do not suggest significant maturity variations with depth in the sample profiles, highlighting that the total organic carbon and bulk bitumen content are dominantly coupled with the developing source facies. These facies and chemostratigraphic trends mirror the implied marine vs. terrigenous organic matter sedimentation and benthic preservation potential, which were at a maximum in the middle Blanknuten Member. These processes appear to be closely related to the supply of nutritious upwelled waters that are further linked with an evolving pan-Arctic 2nd order Middle Triassic transgressive–regressive sequence. Facies and multivariate analyses of the geochemical data show that the lower to middle Muen Member are comparable to the pro-delta mudstones of the younger Tschermakfjellet Formation (Carnian), and that both units are clearly distinct from the increased source rock potential and richness in the upper part of the Muen Member and the entire Blanknuten Member. This provides evidence of genetically different paleo-depositional environments and source rock properties that are confined to the lower and upper parts of the Middle Triassic Botneheia Formation, and may have wide applications for Triassic source rock assessment in the offshore Norwegian Barents Sea

• Engelschiøn, Victoria Sjøholt; Eriksson, S. R.; Cowley, A.; Fateri, M.; Meurisse, A. & Kueppers, U [Show all 7 contributors for this article] (2020). EAC-1A: A novel large-volume lunar regolith simulant. Scientific Reports. ISSN 2045-2322. 10(1), p. 5473–5473. doi: 10.1038/s41598-020-62312-4. Full text in Research Archive
• Roberts, Aubrey Jane; Funke, May-Liss Knudsen; Engelschiøn, Victoria Sjøholt & Hurum, Jørn Harald (2019). The excavation of high arctic, Late Jurassic - Early Cretaceous marine reptiles and their virtual and manual preparation. Geological curator. ISSN 0144-5294. 11, p. 69–79.
• Engelschiøn, Victoria Sjøholt; Delsett, Lene Liebe; Roberts, Aubrey Jane & Hurum, Jørn Harald (2018). Large-sized ichthyosaurs from the Lower Saurian niveau of the Vikinghøgda Formation (Early Triassic), Marmierfjellet, Spitsbergen. Norwegian Journal of Geology. ISSN 2387-5844. 98(2), p. 239–266. doi: 10.17850/njg98-2-05. Full text in Research Archive
• Hurum, Jørn Harald; Engelschiøn, Victoria Sjøholt; Økland, Inghild Halvorsen; Bratvold, Janne; Ekeheien, Christina Pokrie & Roberts, Aubrey Jane [Show all 12 contributors for this article] (2018). The history of exploration and stratigraphy of the Early to Middle Triassic vertebrate-bearing strata of Svalbard (Sassendalen Group, Spitsbergen). Norwegian Journal of Geology. ISSN 2387-5844. 98(2), p. 165–174. doi: 10.17850/njg98-2-04. Full text in Research Archive

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• Engelschiøn, Victoria Sjøholt & Fløtre Eiring, Jakob (2022). Asteroider. Vigmostad & Bjørke. ISBN 9788241957413. 43 p. Show summary

  De dundrer inn i atmosfæren med en glitrende hale, og noen ganger forårsaker de enorme odeleggelser. En vakker bok med enkel tekst om et fascinerende tema. Hva er et stjerneskudd? Hva forteller disse lysende stripene på nattehimmelen oss om solsystemet og universet? Og kan det virkelig være slik at et digert stjerneskudd var det som ledet til dinosaurenes undergang? Geolog og vitenskapsformidler Victoria Sjøholt Engelschiøn gir oss de fascinerende svarene i denne vakkert illustrerte boken om asteroider.

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• Hurum, Jørn Harald; Hammer, Øyvind; Friis, Henrik; Müller, Axel; Engelschiøn, Victoria Sjøholt & Strøm, Marianne (2023). En kort veiledning for de nye utstillingene i Geologisk hus, Naturhistorisk museum, Universitetet i Oslo. Stein. ISSN 0802-9121. p. 3–13.
• Engelschiøn, Victoria Sjøholt (2022). Omvisning i utstillingene.
• Engelschiøn, Victoria Sjøholt (2022). Omvisning i utstillingene.
• Engelschiøn, Victoria Sjøholt (2022). Asteroider.
• Engelschiøn, Victoria Sjøholt (2022). Asteroider.
• Wesenlund, Fredrik; Grundvåg, Sten-Andreas; Engelschiøn, Victoria Sjøholt; Thießen, Olaf; Pedersen, Jon Halvard & Lerch, Benedikt (2022). The role of organic matter production, preservation and dilution on Triassic black shale formation on the Norwegian Barents Shelf.
• Wesenlund, Fredrik; Grundvåg, Sten-Andreas; Engelschiøn, Victoria Sjøholt; Thießen, Olaf; Pedersen, Jon Halvard & Skeie, Jon Erik (2021). The role of water mass restriction vs production on Lower–Middle Triassic source rock formation in Svalbard.
• Wesenlund, Fredrik; Grundvåg, Sten-Andreas; Engelschiøn, Victoria Sjøholt; Thießen, Olaf; Pedersen, Jon Halvard & Skeie, Jon Erik (2021). Multivariate elemental chemostratigraphy of Triassic shales, Eastern Svalbard.
• Engelschiøn, Victoria Sjøholt; Wesenlund, Fredrik; Hurum, Jørn Harald; Hammer, Øyvind & Mørk, Atle (2020). East-west depositional trends and fossil preservation in the Middle Triassic Botneheia Fm. on Svalbard.
• Wesenlund, Fredrik; Grundvåg, Sten-Andreas; Engelschiøn, Victoria Sjøholt; Thießen, Olaf; Pedersen, Jon Halvard & Skeie, Jon Erik (2020). Linking facies variations, organic carbon richness and bulk bitumen content – a case study from the organic-rich Middle Triassic shales of eastern Svalbard.
• Wesenlund, Fredrik; Grundvåg, Sten-Andreas; Engelschiøn, Victoria Sjøholt; Thießen, Olaf; Pedersen, Jon Halvard & Skeie, Jon Erik (2020). Linking facies variations, organic carbon richness and bulk bitumen content – a case study from the organic-rich Middle Triassic shales of eastern Svalbard.
• Wesenlund, Fredrik; Engelschiøn, Victoria Sjøholt; Bernhardsen, Sofie & Grundvåg, Sten-Andreas (2020). The role of source facies on bitumen-derived thermal maturity parameters, Botneheia Formation (Middle Triassic), Eastern Svalbard.
• Roberts, Aubrey Jane; Engelschiøn, Victoria Sjøholt; Delsett, Lene Liebe & Hurum, Jørn Harald (2020). The Early Triassic ‘Grippia’ bone bed of Spitsbergen and its implications for taxonomy and palaeobiogeography of vertebrates after the P‐T extinction event.
• Engelschiøn, Victoria Sjøholt; Hammer, Øyvind; Hurum, Jørn Harald; Bernhardsen, Sofie; Wesenlund, Fredrik & Roberts, Aubrey Jane [Show all 7 contributors for this article] (2020). Large-scale lateral trends in palaeoenvironment and oxygenation in the Middle Triassic Botneheia Fm. on Svalbard.
• Engelschiøn, Victoria Sjøholt (2019). Fossile øgler fra Svalbard - hvordan livet kom seg etter den største masseutryddelsen.
• Engelschiøn, Victoria Sjøholt (2019). Hva gjør en forsker?
• Engelschiøn, Victoria Sjøholt (2019). Hvorfor fysiske data aldri kan digitaliseres fullstendig. Museumsnytt. ISSN 0027-4186. 1, p. 10–11.
• Engelschiøn, Victoria Sjøholt (2019). Rekordfunn på Svalbard: – Dette er så spanande. [Internet]. NRK.
• Engelschiøn, Victoria Sjøholt; Bernhardsen, Sofie; Wesenlund, Fredrik; Hurum, Jørn Harald; Hammer, Øyvind & Roberts, Aubrey Jane [Show all 9 contributors for this article] (2019). Mass death by anoxia - or an exceptional preservation interval? The Middle Triassic bivalve beds of Svalbard.
• Engelschiøn, Victoria Sjøholt; Hammer, Øyvind; Hurum, Jørn Harald; Wesenlund, Fredrik; Bernhardsen, Sofie & Mørk, Atle (2019). East-west trends in palaeoenvironment and oxygenation in the Middle Triassic Botneheia Fm., Svalbard.
• Engelschiøn, Victoria Sjøholt; Bernhardsen, Sofie; Wesenlund, Fredrik; Hurum, Jørn Harald; Hammer, Øyvind & Mørk, Atle (2019). Anoxia and mass death – a high-resolution biofacies study of the Ladinian (Middle Triassic) Blanknuten Mb., Botneheia Fm. on Edgeøya.
• Engelschiøn, Victoria Sjøholt; Bernhardsen, Sofie; Wesenlund, Fredrik; Hammer, Øyvind; Hurum, Jørn Harald & Mørk, Atle (2019). The geobiosphere of the Middle Triassic of Svalbard- linking biofacies to geochemistry.
• Engelschiøn, Victoria Sjøholt; Bernhardsen, Sofie; Wesenlund, Fredrik; Hammer, Øyvind; Hurum, Jørn Harald & Mørk, Atle (2019). "Palaeontology of the Middle Triassic dysoxic succession of the Botneheia Fm., Svalbard".
• Bernhardsen, Sofie; Engelschiøn, Victoria Sjøholt & Mørk, Atle (2019). Occurences of Thalassinoides isp. within an organic rich hydrocarbon source rock; the Botneheia Formation, Edgeøya, Svalbard.
• Wesenlund, Fredrik; Engelschiøn, Victoria Sjøholt; Bernhardsen, Sofie; Grundvåg, Sten-Andreas; Thiessen, Olaf & Pedersen, Jon Halvard [Show all 7 contributors for this article] (2019). Organic facies influence on bitumen-derived thermal maturity parameters in Lower–Upper Triassic shales, Edgeøya, Eastern Svalbard.
• Engelschiøn, Victoria Sjøholt (2018). Livet i mellomtrias på Svalbard. geoforskning.no.
• Wesenlund, Fredrik; Bernhardsen, Sofie; Engelschiøn, Victoria Sjøholt & Røstad, Jostein (2018). Investigating the Middle to Late Triassic Successions on Edgeøya, Svalbard – A Multidisciplinary Approach.
• Roberts, Aubrey Jane; Delsett, Lene Liebe; Druckenmiller, Patrick Scott; Bratvold, Janne; Ekeheien, Christina & Nash, Victoria Engelschiøn [Show all 7 contributors for this article] (2017). The Early Triassic bone beds of Spitsbergen - marine ecosystem recovery after the P/T extinction event.
• Hurum, Jørn Harald; Økland, Inghild Halvorsen; Ekeheien, Christina; Bratvold, Janne; Nash, Victoria Engelschiøn & Roberts, Aubrey Jane [Show all 14 contributors for this article] (2017). Death and survival in the Early Triassic – Svalbard revisited.

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