The enigma of double BSRs: indicators for changes in the hydrate stability field? |
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| Authors: | J Posewang J Mienert |
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| Institution: | SFB313/University Kiel, Heinrich-Hecht-Platz 10, D-24098 Kiel, Germany, DE
Department of Geology, University of Troms?, Dramsveien 201, N-9037 Troms?, Norway, NO
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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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