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The enigma of double BSRs: indicators for changes in the hydrate stability field?

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Abstract

 A classical bottom simulating reflector (BSR) and a presently unknown double BSR pattern are detectable in reflection seismic profiles from the Storegga Slide area west of Norway. Pressure and temperature modeling schemes lead to the assumption that the strong BSR marks the base of a hydrate stability zone with a typical methane gas composition of 99%. The upper double BSR may mark the top of gas hydrates and the lower double BSR may represent a relict of former changes of the hydrate stability field from glacial to interglacial times or the base of gas hydrates with a gas composition including heavier hydrocarbons.

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Authors and Affiliations

  1. SFB313/University Kiel, Heinrich-Hecht-Platz 10, D-24098 Kiel, Germany, , , , , , DE

    J. Posewang

  2. Department of Geology, University of Tromsø, Dramsveien 201, N-9037 Tromsø, Norway, , , , , , NO

    J. Mienert

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  1. J. Posewang
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  2. J. Mienert
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Posewang, J., Mienert, J. The enigma of double BSRs: indicators for changes in the hydrate stability field?. Geo-Marine Letters 19, 157–163 (1999). https://doi.org/10.1007/s003670050103

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  • DOI: https://doi.org/10.1007/s003670050103

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