Javascript is not activated in your browser. This website needs javascript activated to work properly.
You are here

Resurge deposits associated with the shallow marine early Cambrian Vakkejokk impact, north Sweden

  • J. Ormö
  • P. Minde
  • A. T. Nielsen
  • C. Alwmark
Publishing year: 2019
Language: English
Pages: 1246-1261
Publication/Series: Meteoritics and Planetary Science
Volume: 54
Issue: 6
Document type: Journal article
Publisher: Wiley-Blackwell

Abstract english

The lower Cambrian Vakkejokk Breccia is a proximal ejecta layer from a shallow marine impact. It is exposed for ~7 km along a steep mountainside in Lapland, northernmost Sweden. In its central parts, the layer is up to ~27 m thick. Here the breccia shows a vertical differentiation into (1) a lower subunit consisting of strongly deformed target sediments mixed with up to decameter size, mainly crystalline basement clasts (i.e., lower polymict breccia [LPB]); (2) a middle subunit consisting of a polymict, blocky to gravelly breccia, commonly graded (i.e., graded polymict breccia [GPB]), that, in turn, is sporadically overlain by (3) a few dm thick, sandy bed (i.e., top sandstone [TS]). Previous work interpreted the graded beds as deposited by resurging water during early crater modification. We made three short (<1.35 m) core drillings through the graded beds. The line-logging technique previously used on cores from other marine-target craters was complemented by logging of equal-sized cells in photos made along the cores. Granulometry and clast lithology determinations provide further evidence for the top beds of the breccia being resurge deposits. However, the magnitude of this resurge can only be assessed by future deep core drilling of the infill of the crater hidden below the mountain.


  • Geology


  • ISSN: 1086-9379
Carl Alwmark
E-mail: carl [dot] alwmark [at] geol [dot] lu [dot] se

Senior lecturer

Lithosphere and Biosphere Science

+46 46 222 78 71


Sölvegatan 12, Lund