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Book Chapter

High Arctic geopotential stress field and implications for geodynamic evolution

By
Christian Schiffer
Christian Schiffer
Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
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Christian Tegner
Christian Tegner
Department of Geoscience, Centre of Earth System Petrology, Aarhus University, 8000 Aarhus, Denmark
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Andrew J. Schaeffer
Andrew J. Schaeffer
Department of Earth and Environmental Sciences, University of Ottawa, 120 University, Ottawa, Ontario, Canada, K1N 6N5
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Victoria Pease
Victoria Pease
Department of Geological Sciences, Stockholm University, Stockholm 106 91, Sweden
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Søren B. Nielsen
Søren B. Nielsen
Department of Geoscience, Centre of Earth System Petrology, Aarhus University, 8000 Aarhus, Denmark
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Published:
January 01, 2018

Abstract

We use new models of crustal structure and the depth of the lithosphere–asthenosphere boundary to calculate the geopotential energy and its corresponding geopotential stress field for the High Arctic. Palaeostress indicators such as dykes and rifts of known age are used to compare the present day and palaeostress fields. When both stress fields coincide, a minimum age for the configuration of the lithospheric stress field may be defined. We identify three regions in which this is observed. In north Greenland and the eastern Amerasia Basin, the stress field is probably the same as that present during the Late Cretaceous. In western Siberia, the stress field is similar to that in the Triassic. The stress directions on the eastern Russian Arctic Shelf and the Amerasia Basin are similar to that in the Cretaceous. The persistent misfit of the present stress field and Early Cretaceous dyke swarms associated with the High Arctic Large Igneous Province indicates a short-lived transient change in the stress field at the time of dyke emplacement. Most Early Cretaceous rifts in the Amerasia Basin coincide with the stress field, suggesting that dyking and rifting were unrelated. We present new evidence for dykes and a graben structure of Early Cretaceous age on Bennett Island.

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Contents

Geological Society, London, Special Publications

Circum-Arctic Lithosphere Evolution

V. Pease
V. Pease
Stockholm University, Sweden
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B. Coakley
B. Coakley
University of Alaska, Fairbanks, USA
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The Geological Society of London
Volume
460
ISBN electronic:
9781786203410
Publication date:
January 01, 2018

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