Abstract

A systematic search for impact indicators was conducted on a core of Late Jurassic–Early Cretaceous sedimentary strata from the vicinity of the proposed Mjølnir impact structure, Barents Sea. A 0.8-m-thick section of the core was found to contain unequivocal indicators of meteoritic impact: shocked quartz grains and a strong enrichment in iridium. The ejecta-bearing strata were discovered only 30 km north-northeast of the structure, within a stratigraphic interval corresponding to the seismically defined deformation event at Mjølnir. Further study of this unusually well preserved impact-crater-ejecta-layer pair may help constrain poorly understood aspects of large-magnitude meteorite impacts into the oceans.

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