Now showing items 21-40 of 767

    • Paleokarst reservoir modelling - A concept-driven approach 

      Lønøy, Bjarte (Doctoral thesis, 2021-08-20)
      A significant proportion of the world's hydrocarbon production comes from paleokarst reservoirs. Although these reservoirs boast some of the most productive wells in oil history, the recovery factor is relatively low ...
    • Seasonal sea ice persisted through the Holocene Thermal Maximum at 80°N 

      Pieńkowski, Anna J.; Husum, Katrine; Belt, Simon T.; Ninnemann, Ulysses S; Köseoğlu, Denizcan; Divine, Dmitry V.; Smik, Lukas; Knies, Jochen; Hogan, Kelly; Noormets, Riko (Journal article; Peer reviewed, 2021)
      The cryospheric response to climatic warming responsible for recent Arctic sea ice decline can be elucidated using marine geological archives which offer an important long-term perspective. The Holocene Thermal Maximum, ...
    • Sea ice thickness from air-coupled flexural waves 

      Romeyn, Rowan; Hanssen, Alfred; Ruud, Bent Ole; Johansen, Tor Arne (Journal article; Peer reviewed, 2021)
      Air-coupled flexural waves (ACFWs) appear as wave trains of constant frequency that arrive in advance of the direct air wave from an impulsive source travelling over a floating ice sheet. The frequency of these waves varies ...
    • Late Holocene canyon-carving floods in northern Iceland were smaller than previously reported 

      Bilt, Willem Godert Maria van der; Barr, Iestyn D.; Berben, Sarah Miche Patricia; hennekam, rick; Lane, Timothy P.; Adamson, Kathryn; Bakke, Jostein (Journal article; Peer reviewed, 2021)
      Catastrophic floods have formed deep bedrock canyons on Earth, but the relationship between peak discharge and bedrock erosion is not clearly understood. This hinders efforts to use geological evidence of these cataclysmic ...
    • Cold spells in the Nordic Seas during the early Eocene Greenhouse 

      Vickers, Madeleine L.; Lengger, Sabine K.; Bernasconi, Stefano M.; Thibault, Nicolas; Schultz, Bo; Bremer, Alvaro Fernandez; Ullmann, Clemens V.; McCormack, Paul; Bjerrum, Christian J.; Rasmussen, Jan Audun; Hougård, Iben Winther; Korte, Christoph (Journal article; Peer reviewed, 2020)
      The early Eocene (c. 56 - 48 million years ago) experienced some of the highest global temperatures in Earth’s history since the Mesozoic, with no polar ice. Reports of contradictory ice-rafted erratics and cold water ...
    • Frictional properties and microstructural evolution of dry and wet calcite-dolomite gouges 

      Demurtas, Matteo; Smith, Steven A.F.; Spagnuolo, Elena; Di Toro, Giulio (Journal article; Peer reviewed, 2021)
      Calcite and dolomite are the two most common minerals in carbonate-bearing faults and shear zones. Motivated by observations of exhumed seismogenic faults in the Italian Central Apennines, we used a rotary-shear apparatus ...
    • Abiotic synthesis of methane and organic compounds in Earth’s lithosphere 

      Reeves, Eoghan; Fiebig, Jens (Journal article; Peer reviewed, 2020)
      Accumulation of molecular hydrogen in geologic systems can create conditions energetically favorable to transform inorganic carbon into methane and other organic compounds. Although hydrocarbons with a potentially abiotic ...
    • Earthquake statistics changed by typhoon-driven erosion 

      Steer, Philippe; Jeandet, Louise; Cubas, Nadaya; Marc, Odin; Meunier, Patrick; Simoes, Martine; Cattin, Rodophe; Shyu, J. Bruce H.; Mouyen, Maxime; Liang, Wen-Tzong; Theunissen, Thomas; Chiang, Shou-Hao; Hovius, Niels (Journal article; Peer reviewed, 2020)
      Tectonics and climate-driven surface processes govern the evolution of Earth’s surface topography. Topographic change in turn influences lithospheric deformation, but the elementary scale at which this feedback can be ...
    • Growth of collisional orogens from small and cold to large and hot ‐ inferences from geodynamic models 

      Wolf, Sebastian; Huismans, Ritske; Munoz, Josep Anton; Curry, Magdalena Ellis; van der Beek, Peter (Journal article; Peer reviewed, 2021)
      It is well documented that the interplay between crustal thickening and surface processes determines growth of continent-continent collision orogens from small and cold to large and hot. Additionally, studies have demonstrated ...
    • Basement highs: definitions, characterisation and origins 

      Peacock, David; Banks, Graham (Journal article; Peer reviewed, 2020)
      A glossary of commonly used terms related to the geometric forms and geological settings of basement highs is presented to assist cross-disciplinary understanding, qualifying prefixes for the term basement are discussed ...
    • Sedimentary anatomy and hydrological record of relic fluvial deposits in a karst cave conduit 

      Bella, Pavel; Gradziński, Michał; Hercman, Helena; Leszczyński, Stanisław; Nemec, Wojciech (Journal article; Peer reviewed, 2021)
      This case study from the renowned Demänová Cave System in the Carpathians of Slovakia demonstrates that the conventional methods of fluvial sedimentology, combined with an allostratigraphic mapping and speleothem U-series ...
    • Citizen Seismology in the Arctic 

      Jeddi, Zeinab; Voss, Peter H.; Sørensen, Mathilde B.; Danielsen, Finn; Dahl-Jensen, Trine; Larsen, Tine B.; Nielsen, G.; Hansen, A.; Jakobsen, P.; Frederiksen, P.O. (Journal article; Peer reviewed, 2020)
      Landslides, earthquakes and other natural disasters are expected to increase in the Arctic, yet our ability to make informed decisions about safety is tightly limited by lack of data. As part of the Integrated Arctic ...
    • Disentangling source of moisture driving glacier dynamics and identification of 8.2 ka event: evidence from pore water isotopes, Western Himalaya 

      Kumar, Om; Ramanathan, Al L.; Bakke, Jostein; Kotlia, Bata; Shrivastava, J. P. (Journal article; Peer reviewed, 2020)
      Two atmospheric circulation patterns, the Indian Summer Monsoon (ISM) and mid-latitude Westerlies control precipitation and thus glacier variability in the Himalaya. However, the role of the ISM and westerlies in controlling ...
    • Geological control on dinosaurs’ rise to dominance: Late Triassic ecosystem stress by relative sea level change 

      Klausen, Tore Grane; Paterson, Niall William; Benton, Michael J. (Journal article; Peer reviewed, 2020)
      The Late Triassic is enigmatic in terms of how terrestrial life evolved: it was the time when new groups arose, such as dinosaurs, lizards, crocodiles and mammals. Also, it witnessed a prolonged period of extinctions, ...
    • Geochemical characterization of ophiolites in the Alpine-Himalayan Orogenic Belt: Magmatically and tectonically diverse evolution of the Mesozoic Neotethyan oceanic crust 

      Furnes, Harald; Dilek, Yildirim; Zhao, Guochun; Safonova, Inna; Santosh, M. (Journal article; Peer reviewed, 2020)
      Ophiolites are important archives of oceanic crust development and preservation in the rock record, and the Alpine-Himalayan Orogenic Belt (AHOB) is one of the most comprehensive ophiolite depositories in earth’s history. ...
    • Ultramafic rock carbonation: Constraints from listvenite core BT1B, Oman Drilling Project 

      Beinlich, Andreas; Plumper, Oliver; Boter, Esmee; Müller, Inigo A.; Kourim, Fatma; Ziegler, Martin; Harigane, Yumiko; Lafay, Romain; Kelemen, Peter B. (Journal article; Peer reviewed, 2020)
      The occurrence of the quartz-carbonate alteration assemblage (listvenite) in ophiolites indicates that ultramafic rock represents an effective sink for dissolved CO2. However, the majority of earlier studies of ultramafic ...
    • Stable oxygen isotope reconstruction of temperature exposure of the Icelandic cod (Gadus morhua) stock over the last 100 years 

      Von Leesen, Gotje; Ninnemann, Ulysses S; Campana, Steven E. (Journal article; Peer reviewed, 2020)
      Increasing water temperatures are predicted around the globe, with high amplitudes of warming in Subarctic and Arctic regions where Atlantic cod (Gadus morhua) populations currently flourish. We reconstructed oxygen isotope ...
    • Regional correlation and seismic stratigraphy of Triassic Strata in the Greater Barents Sea: implications for sediment transport in Arctic basins 

      Gilmullina, Albina; Klausen, Tore Grane; Paterson, Niall William; Suslova, Anna A.; Eide, Christian Haug (Journal article; Peer reviewed, 2020)
      The Greater Barents Sea Basin (GBSB) in Arctic Russia and Norway is an intracratonic basin that accommodated an enormous amount of sediment during the Triassic. These deposits are up to 4.5 km thick over an area 2,500,000 ...
    • Chlamydial contribution to anaerobic metabolism during eukaryotic evolution 

      Stairs, Courtney W.; Sharamshi, Jennah E.; Tamarit, Daniel; Eme, Laura; Jørgensen, Steffen Leth; Spang, Anja; Ettema, Thijs J.G. (Journal article; Peer reviewed, 2020)
      The origin of eukaryotes is a major open question in evolutionary biology. Multiple hypotheses posit that eukaryotes likely evolved from a syntrophic relationship between an archaeon and an alphaproteobacterium based on ...
    • Palaeo-productivity record from Norwegian Sea enables North Atlantic Oscillation (NAO) reconstruction for the last 8000 years 

      Becker, Lukas; Sejrup, Hans Petter; Hjelstuen, Berit Oline Blihovde; Haflidason, Haflidi; Kjennbakken, Heidi; Werner, Johannes (Journal article; Peer reviewed, 2020)
      The North Atlantic Oscillation is the dominant atmospheric driver of North Atlantic climate variability with phases corresponding to droughts and cold spells in Europe. Here, we exploit a suggested anti-correlation of North ...