Salt tectonics in the northeastern Nordkapp Basin, southwestern Barents Sea
- Hans Ramberg Tectonic Lab., Uppsala (Sweden)
- Saga Petroleum a.s., Sandvika (Norway)
Salt structures in the northeastern Nordkapp subbasin are interpreted on reflection seismic profiles. Thickness variations indicate localized accumulation of the mother salt in Late Carboniferous-Early Permian time. Rapid sedimentation in the Early Triassic accompanied rise of salt into asymmetric salt pillows during regional extension. These pillows domed the prekinematic Permian sediments and became diapiric during the late Early-Middle Triassic, perhaps as a result of thin-skinned normal faulting decoupled by the salt from old basements faults reactivated by thick-skinned regional (northwest-southeast) extension. Variations in size, maturity, and evolution history of individual salt structures can be attributed to local differences in thickness of the initial salt layer and its burial history. Salt structures form three rows concentric to the basin margins and cover {approximately}20% of the basin area. Some salt stocks appear to overlie basement faults. Asymmetric primary, secondary, and in places tertiary, peripheral sinks indicate that salt was withdrawn mainly from the basin side of most diapirs throughout Triassic downbuilding.
- OSTI ID:
- 585194
- Journal Information:
- AAPG Memoir, Journal Issue: 65; Other Information: PBD: 1996
- Country of Publication:
- United States
- Language:
- English
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