Early Tertiary plume uplift of the North Sea and Faeroe-Shetland basins

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doi: 10.1016/S0012-821X(97)00035-6
Authors:Nadin, P. A.; Kusznir, N. J.; Cheadle, M. J.
Author Affiliations:Primary:
University of Liverpool, Department of Earth Sciences, Liverpool, United Kingdom
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 148(1-2), p.109-127. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1997
Note:In English. 64 refs.; illus., incl. sects., sketch maps
Summary:The Cretaceous and Tertiary post-rift subsidence history of the northern North Sea and the Faeroe-Shetland Basins, formed by Jurassic and Cretaceous rifting, show substantial departures from McKenzie post-rift subsidence in the Early Tertiary. These departures can be explained by regional Palaeocene uplift, followed by rapid decay of this uplift in the Eocene through to the present day. Forward and reverse 2-D modelling of syn- and post-rift stratigraphy, using flexural isostasy, has been used to determine the magnitude and timing of this uplift event. In the northern North Sea Basin (NNSB), modelling predicts Palaeocene uplift to have been of the order of 375-525 m, increasing northwards. In the Faeroe-Shetland Basin, Palaeocene uplift is estimated to have been 900 m. The timing of Palaeocene uplift in the NNSB and northern Britain is consistent with the development of the Early Tertiary Icelandic plume (c. 64 Ma) or a related plume. Palaeocene uplift in the NNSB is attributed to dynamic uplift generated by mantle fluid flow driven by ascending hot plume material. Magmatic underplating or buoyancy from heated lithosphere are not believed to be significant mechanisms for regional Palaeocene uplift in the NNSB. The decay of Palaeocene uplift in the NNSB occurs more rapidly than predicted by simple conductive cooling of heated lithosphere. Rapid decay of uplift in the NNSB is attributed to a temperature decrease of the plume in the Early Eocene (c. 55 Ma), resulting in a decrease in dynamic uplift, and coincides with a decrease in volcanic activity within the British Tertiary and Greenland Igneous Provinces, and the initiation of sea-floor spreading between Greenland and northwest Europe. The plume responsible for Palaeocene uplift in the NNSB and northern Britain may have been located in the Faeroe-East Greenland area, although a smaller transient plume within the British Tertiary Igneous Province may also have contributed to uplift. Abstract Copyright (1997) Elsevier, B.V.
Subjects:Cenozoic; Convection; Crust; Flexure; Isostasy; Lower Tertiary; Mantle; Mantle plumes; Oceanic crust; Tertiary; Two-dimensional models; Uplifts; Atlantic Ocean; North Atlantic; North Sea; Faeroe Basin; Shetland Basin
Abstract Numbers:97M/4267
Record ID:1997049233
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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