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- W2012604835 abstract "Abstract In the deepest part of the Skagerrak, the sea-floor morphology and the subsurface geology have been mapped from multibeam echo sounder data, seismic data and bedrock cores. An area of high pockmark density occurs along the shallowest part of a gentle ridge in the central Norwegian Trench, where a Middle Jurassic sandstone unit subcrops below 30–40 m of Late Weichselian sediments. In contrast, few pockmarks occur at the seabed where Lower and Upper Jurassic shales and clayey siltstones subcrop. The concentration of pockmarks above the Middle Jurassic sandstone unit is thus attributed to seepage of gas or liquids migrating up-dip from deeper parts of the sedimentary basin. In the Skagerrak, more than 90% of the observed pockmarks occur above Mesozoic sedimentary rocks, while less than 10% occur in areas of Palaeozoic metasediments or crystalline rocks. A linear concentration of pockmarks is observed above a fault that terminates at the base of the Quaternary succession, and this is therefore attributed to seepage of gas or liquids along the fault plane. The density of pockmarks is low in areas with thick successions of Quaternary sediments, indicating that the pockmarks are not related to seepage of biogenic gas from these deposits. Pockmarks in the Skagerrak are thus caused by seepage of thermogenic gas and/or other pore fluids from deeper sources, and their distribution may help to improve our understanding of the fluid system and migration regime of this part of the North Sea." @default.
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- W2012604835 date "1999-11-01" @default.
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- W2012604835 title "Sea-bed pockmarks related to fluid migration from Mesozoic bedrock strata in the Skagerrak offshore Norway" @default.
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- W2012604835 doi "https://doi.org/10.1016/s0264-8172(99)00017-3" @default.
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