Relative sea-level, tectono-eustasy, geoidal-eustasy and geodynamics during the Cretaceous |
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Authors: | N -A Mrner |
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Institution: | Geological Institute, Stockholm University, Box 6801, S-113 86 Stockholm, Sweden |
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Abstract: | A priori, the recorded relative sea-level changes during the Cretaceous must be the combined effect of tectono-eustasy, geoidal-eustasy and various crustal level changes. To this we must add the human factor of differences and errors in interpretations.A posteriori, it is claimed that geoidal-eustasy dominated during the Hauterivian, Barremian, Turonian, Santonian and Maastrichtian, that tectono-eustasy dominated during the Albian, Cenomanian, Campanian and at the Maastrichtian/Danian boundary, and that local influences of sea-floor spreading are identified from the Albian/Cenomanian boundary onwards. To this we must add the local differential crustal movements modulating the global and regional ocean level changes. Geoidal-eustasy is mainly expressed as a latitudinal differentiation of the sea-level with out-of-phase changes between the hemispheres or the both high latitude regions. Furthermore, sedimentological records seem to record short-period geoidal-eustatic cycles. |
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Keywords: | Tectono-eustasy Geoidal-eustasy Crustal movements Albian Barremian Campanian Cenomanian Hauterivian Maastrichtian Santonian Turonian Maastrichtian/Danian boundary |
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