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Abstract
Chapter from: M
65: Salt Tectonics: A Global Perspective
Edited By
M.P.A. Jackson, D.G. Roberts, and S. SnelsonAuthors:
Kare T. Nilsen, Bruno C. Vendeville, and Jan-Terje Johansen Structure, Tectonics, Paleostructure
Published 1995 as
part of Memoir 65
Copyright © 1995 The American Association of Petroleum
Geologists. All Rights Reserved.
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Nilsen,
K. T., B. C. Vendeville, J.-T. Johansen, 1995, Influence of regional tectonics
on halokinesis in the Nordkapp Basin, Barents Sea, in M. P. A. Jackson,
D. G. Roberts, and S. Snelson, eds., Salt tectonics: a global perspective:
AAPG Memoir 65, p. 413-436. |
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Chapter
20
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Influence
of Regional Tectonics on Halokinesis in the Nordkapp Basin, Barents Sea |
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| Kåre
T. Nilsen
Norwegian Petroleum Directorate
Harstad, Norway |
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Bruno C.
Vendeville
Bureau of Economic Geology
The University of Texas
at Austin
Austin, Texas, U.S.A.
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Jan-Terje
Johansen
Norwegian Petroleum Directorate
Harstad, Norway
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Abstract
Seismic analysis
of salt structures in the Nordkapp Basin, a deep salt basin in the southern
Barents Sea, combined with experimental modeling suggests that regional
tectonics closely controlled diapiric growth. Diapirs formed in the Early
Triassic during basement-involved regional extension. The diapirs then
rose rapidly by passive growth and exhausted their source layer. Regional
extension in the Middle-Late Triassic triggered down-to-the-basin gravity
gliding, which laterally shortened the diapirs. This squeezed salt out
of diapir stems, forcing diapirs to rise, extrude, and form diapir overhangs.
After burial under more than 1000 m of Upper Triassic-Lower Cretaceous
sediments, the diapirs were rejuvenated by a Late Cretaceous episode of
regional extension and gravity gliding, which deformed their thick roofs.
After extension, diapirs stopped rising and were buried under 1500 m of
lower Tertiary sediments. Regional compression of the Barents Sea region
in the middle Tertiary caused one more episode of diapiric rise. Diapirs
in the Nordkapp Basin are now extinct. |
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