Cristin-resultat-ID: 1956277
Sist endret: 19. november 2021, 10:14
Resultat
Populærvitenskapelig foredrag
2021

Pre-salt Carboniferous basin architecture, structural inheritance and segmentation in the Nordkapp Basin, Barents Sea.

Bidragsytere:
  • Muhammad Hassaan
  • Jan Inge Faleide
  • Roy Helge Gabrielsen og
  • Filippos Tsikalas

Presentasjon

Navn på arrangementet: Winter conference 2021 -
Sted: Digital
Dato fra: 6. januar 2021
Dato til: 8. januar 2021

Arrangør:

Arrangørnavn: Norsk Geologisk Forening

Om resultatet

Populærvitenskapelig foredrag
Publiseringsår: 2021

Beskrivelse Beskrivelse

Tittel

Pre-salt Carboniferous basin architecture, structural inheritance and segmentation in the Nordkapp Basin, Barents Sea.

Sammendrag

Reprocessed regional 2D seismic reflection profiles, 3D seismic data, available wells, and gravity and magnetic data were used to study the pre-salt rift architecture in the Nordkapp Basin, Barents Sea, and its impact on the evaporite accumulations and distribution of salt structures. The basin is subdivided into three main segments (the northeastern, central, and southwestern sub-basins) and has evolved over the complex interaction between the Timanian and Caledonian structural basement grains. Each segment is characterized by prominent magnetic anomalies related to the Timanian and Caledonian structural inheritance. The rotated magnetic lineations associated with the Caledonian structures beneath the Finnmark Platform pass through the central segment, where the Middle Allochthonous Front creates the major sub-division between the two structural grains. We suggest that the rheological properties, locations, orientations and interaction of the parts of the basement influenced by Timanian and Caledonian structural grains together with two subsequent extensional phases, have strongly influenced the shallower pre-salt rift architecture. During the late Devonian – early Carboniferous NE-SW -oriented extensional phase, the Nordkapp Basin consisted of a northern and a southern regional halfgraben separated by an elevated interbasin ridge. The hinged margins of the northern and southern regional half-grabens were restricted against the NW-SE-striking graben beneath the Veslekari Dome and Troms- Finnmark Fault Complex, respectively. The internal configuration of the regional half-grabens was affected by the NW-SE-striking master faults. During the late Carboniferous to early Permian, a second extension phase took place with a shift in stress orientation to NW -SE and influenced the two regional half-grabens. In particular, a transfer fault with the character of an interbasin transfer zone (the northern transfer zone) divided the northern regional half-graben by separating its hinged margin (incipient northeastern segment) from the deeper part (incipient central segment). At the same time, the elevated interbasin ridge acted as a southern transfer zone, separating the incipient central and southwestern segments of the Nordkapp Basin. The Thor Iversen, Polstjerna, Måsøy and Nysleppen basin border fault systems were formed during the second extensional phase and reshaped the internal configuration of the two regional half-grabens. The structural interaction between the spatially variable Timanian and Caledonian structural grains overprinted by two subsequent phases of NE-SW and NW-SE extension caused the development of seven sub-basins in the Nordkapp Basin. Internally within the sub-basins, the evolving structural elements including cross-cutting master faults and structural highs have influenced the deposition and facies of the layered evaporitic sequences and defined the location of subsequent salt structures. We suggest that the relative depth of each sub-basin, the arrangement of structural highs along with the evolving master faults and the depositional paleo-environment all controlled the thickness and facies of the syn-rift layered evaporitic sequences.

Bidragsytere

Muhammad Hassaan

  • Tilknyttet:
    Forfatter
    ved Studier av sedimentære bassenger ved Universitetet i Oslo

Jan Inge Faleide

  • Tilknyttet:
    Forfatter
    ved Studier av sedimentære bassenger ved Universitetet i Oslo

Roy Helge Gabrielsen

  • Tilknyttet:
    Forfatter
    ved Institutt for geofag ved Universitetet i Oslo

Filippos Tsikalas

  • Tilknyttet:
    Forfatter
    ved Studier av sedimentære bassenger ved Universitetet i Oslo
1 - 4 av 4