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6 - Continental Rifting

Published online by Cambridge University Press:  24 January 2025

Haakon Fossen
Affiliation:
Universitetet i Bergen, Norway
Christian Teyssier
Affiliation:
University of Minnesota
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Summary

Chapter 6 covers continental rifting and rift-related processes that operate when continental lithosphere is thinned and broken. It covers the two fundamental modes of rift initiation; active and passive rifting. It also cover the role of mantle plumes and pre-rift structures that weaken the lithosphere. Magmatism typically varies along rift systems and is often related to plume influence during rift initiation. The main structural elements of rifts are presented, from rift transfer zones to fault relay ramps, together with the evolution of rifts in terms of fault growth, strain, crustal thinning and rift (a)symmetry. While some rifts open orthogonally, most rifts experience oblique rifting. Other rifts again show evidence of two or more phases of extension, and the interference between the two phases in terms of fault orientation and interaction is discussed. Different tectonic settings, such as back-arc rifting, transform fault settings, and orogen-related rifting are covered. The deposition of sediments in relation to structural elements is important, and both synrift and postrift sedimentation are discussed. Rifts also host important hydrocarbon and mineral resources, and examples from northern Europe and North America are provided in this chapter.

Type
Chapter
Information
Plate Tectonics , pp. 119 - 148
Publisher: Cambridge University Press
Print publication year: 2024

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References

Further Reading

Buck, W. R., Lavier, L. L., Poliakov, A. N. B., 1999. How to make a rift wide. Philosophical Transactions of the Royal Society of London Series A: Mathematical, Physical and Engineering Sciences 357, 671693.Google Scholar
Corti, G., 2009. Continental rift evolution: From rift initiation to incipient break-up in the Main Ethiopian Rift, East Africa. Earth-Science Reviews 96, 153. https://doi.org/10.1016/j.earscirev.2009.06.005https://s100.copyright.com/AppDispatchServlet?publisherName=ELS&contentID=S0012825209000890&orderBeanReset=trueCrossRefGoogle Scholar
Gawthorpe, R., Leeder, M.R., 2000. Tectono-sedimentary evolution of active extensional basins. Basin Research 12, 195218. https://doi.org/10.1111/j.1365-2117.2000.00121.xCrossRefGoogle Scholar
Schlische, R. W., Withjack, M. O., 2009. Origin of fault domains and fault-domain boundaries (transfer zones and accommodation zones) in extensional provinces: Result of random nucleation and self-organized fault growth. Journal of Structural Geology 31, 910926. https://doi.org/10.1016/j.jsg.2008.09.005CrossRefGoogle Scholar
Underhill, J. R., Partington, M. A., 1993. Jurassic thermal doming and deflation in the North Sea: Implications of the sequence stratigraphic evidence, in Petroleum Geology of Northwest Europe: Proceedings of the 4th Conference, Parker, J. R. (ed.), pp. 337346. doi: 10.1144/0040337CrossRefGoogle Scholar

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