2021
The deep Møre and Vøring basins of the Norwegian Sea as basement highs prior to Late Jurassic rifting
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Prior to the Kimmeridgian–Tithonian climax stage of the Jurassic rift episode emergent basement occupied the area between deep sediment basins offshore Mid Norway and onshore East Greenland. The basement high was remnants of the mountain range that developed during the Late Silurian–Early Devonian finalPrior to the Kimmeridgian–Tithonian climax stage of the Jurassic rift episode emergent basement occupied the area between deep sediment basins offshore Mid Norway and onshore East Greenland. The basement high was remnants of the mountain range that developed during the Late Silurian–Early Devonian finalstage of the Caledonian Orogeny. The sediment basin offshore Mid Norway was built upon a crustinvolved in Caledonian continent-continent collision and crossed over the Laurentia–Baltica plateboundary. Drillhole observations demonstrate that Triassic, Lower and Middle Jurassic sediments enteringbasins from the west contain conglomerates and sandstones derived from the emergent landmass.Along western basin margins, beneath the southeastern Møre Basin and the Halten Terrace, thecoarse-clastic sediments were deposited under fluvial, deltaic and marginal marine conditions anddeltaic clinoforms are recorded in Jurassic sandstones on the western Halten Terrace. Basementessentially remained as positive topographic elements and an important source for sediments until late Middle Jurassic when basement was worn down and became insignificant as westerly source areas.Due to Late Jurassic rifting, eastern parts of the basement high were converted into hyperextended intra-continental rift basins later infilled by thick Cretaceous sediments, which gave rise to the deep and now 200 km-wide Møre and Vøring basins.

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