10 Result(s)
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Sverre Planke
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Article
Open AccessShallow-water hydrothermal venting linked to the Palaeocene–Eocene Thermal Maximum
The Palaeocene–Eocene Thermal Maximum (PETM) was a global warming event of 5–6 °C around 56 million years ago caused by input of carbon into the ocean and atmosphere. Hydrothermal venting of greenhouse gases p...
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Open AccessMeltwater sediment transport as the dominating process in mid-latitude trough mouth fan formation
Trough mouth fans comprise the largest sediment deposits along glaciated margins, and record Pleistocene climate changes on a multi-decadal time scale. Here we present a model for the formation of the North Se...
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A nutrient control on marine anoxia during the end-Permian mass extinction
Oxygen deprivation and hydrogen sulfide toxicity are considered potent kill mechanisms during the mass extinction just before the Permian–Triassic boundary (~251.9 million years ago). However, the mechanism th...
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Open AccessAuthor Correction: Glacigenic sedimentation pulses triggered post-glacial gas hydrate dissociation
The original version of this Article contained an error in the second sentence of the Abstract, which incorrectly read ‘They are stable under high pressure and low, but react sensitively to environmental chang...
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Open AccessGlacigenic sedimentation pulses triggered post-glacial gas hydrate dissociation
Large amounts of methane are stored in continental margins as gas hydrates. They are stable under high pressure and low temperature, but react sensitively to environmental changes. Bottom water temperature and...
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Open AccessConstraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers
Radioisotopic dating of volcanic minerals is a powerful method for establishing absolute time constraints in sedimentary basins, which improves our understanding of the chronostratigraphy and evolution of basi...
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A petrologic, geochemical and Sr–Nd isotopic study on contact metamorphism and degassing of Devonian evaporites in the Norilsk aureoles, Siberia
Devonian evaporites and associated sedimentary rocks in the Norilsk region were contact metamorphosed during emplacement of mafic sills that form part of the end-Permian (~252 Ma) Siberian Traps. We present mi...
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Release of methane from a volcanic basin as a mechanism for initial Eocene global warming
A 200,000-yr interval of extreme global warming marked the start of the Eocene epoch about 55 million years ago. Negative carbon- and oxygen-isotope excursions in marine and terrestrial sediments show that thi...
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Seep carbonate formation controlled by hydrothermal vent complexes: a case study from the Vøring Basin, the Norwegian Sea
Several hundred hydrothermal vent complexes were formed in the Vøring Basin as a consequence of magmatic sill emplacement in the late Palaeocene. The 6607/12-1 exploration well was drilled through a 220-m-thic...
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Deep crustal structure and rheology of the Gascoyne volcanic margin, western Australia
Interpretation of deep seismic reflection data across the Gascoyne Margin reveals six distinct seismic facies units related to the tectono-magmatic breakup history. On the outer Exmouth Plateau four large scal...
