HR: 1340h
AN: U23A-0856    [Abstracts]
TI: The Mjoelnir impact crater – revisited
AU: * Werner, S
EM: stephanie.werner@ngu.no
AF: Geological Survey of Norway (NGU), Leiv Eirikssons vei 39, Trondheim, 7491, Norway
AU: Torsvik, T H
EM: trond.torsvik@ngu.no
AF: Geological Survey of Norway (NGU), Leiv Eirikssons vei 39, Trondheim, 7491, Norway
AU: Smelror, M
EM: morten.smelror@ngu.no
AF: Geological Survey of Norway (NGU), Leiv Eirikssons vei 39, Trondheim, 7491, Norway
AB: The Mjølnir impact crater was discovered in seismic reflection data in the 1990's, and the detailed structure is well established. The submarine crater, situated in the southwestern Barents Sea, has a crater diameter of about 40 km, and a shallow relief (about 50 m). The crater is buried under a layer of sediments. Stratigraphic relationships (drill core 7329/03-U01) indicate a Cretaceous formation age at around 140 Ma ago. Here, density and magnetic susceptibility measurements of core samples are presented and used to interpret a newly available aeromagnetic survey and gravity data, and to forward model the potential field anomaly data of the area, in order to better constrain the signature of the crater. We will also develop a detailed Cretaceous palaeogeographic reconstruction at the time of impact. This investigation is conducted to support future drilling at the Mjølnir impact site.
DE: 1027 Composition of the planets
DE: 1060 Planetary geochemistry (5405, 5410, 5704, 5709, 6005, 6008)
DE: 5420 Impact phenomena, cratering (6022, 8136)
SC: Union [U]
MN: 2007 Fall Meeting