Schiffer, Christian and Doré, Anthony G. and Foulger, Gillian R. and Franke, Dieter and Geoffroy, Laurent and Gernigon, Laurent and Holdsworth, Bob and Kusznir, Nick and Lundin, Erik and McCaffrey, Ken and Peace, Alex and Petersen, Kenni D. and Phillips, Thomas and Stephenson, Randell and Stoker, Martyn S. and Welford, Kim (2020) 'Structural inheritance in the North Atlantic.', Earth-science reviews., 206 . p. 102975.
The North Atlantic, extending from the Charlie Gibbs Fracture Zone to the north Norway-Greenland-Svalbard margins, is regarded as both a classic case of structural inheritance and an exemplar for the Wilson-cycle concept. This paper examines different aspects of structural inheritance in the Circum-North Atlantic region: 1) as a function of rejuvenation from lithospheric to crustal scales, and 2) in terms of sequential rifting and opening of the ocean and its margins, including a series of failed rift systems. We summarise and evaluate the role of fundamental lithospheric structures such as mantle fabric and composition, lower crustal inhomogeneities, orogenic belts, and major strike-slip faults during breakup. We relate these to the development and shaping of the NE Atlantic rifted margins, localisation of magmatism, and microcontinent release. We show that, although inheritance is common on multiple scales, the Wilson Cycle is at best an imperfect model for the Circum-North Atlantic region. Observations from the NE Atlantic suggest depth dependency in inheritance (surface, crust, mantle) with selective rejuvenation depending on time-scales, stress field orientations and thermal regime. Specifically, post-Caledonian reactivation to form the North Atlantic rift systems essentially followed pre-existing orogenic crustal structures, while eventual breakup reflected a change in stress field and exploitation of a deeper-seated, lithospheric-scale shear fabrics. We infer that, although collapse of an orogenic belt and eventual transition to a new ocean does occur, it is by no means inevitable.
|Full text:||(AM) Accepted Manuscript|
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
Download PDF (5089Kb)
|Publisher Web site:||https://doi.org/10.1016/j.earscirev.2019.102975|
|Publisher statement:||© 2019 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/|
|Date accepted:||04 October 2019|
|Date deposited:||08 January 2020|
|Date of first online publication:||18 October 2019|
|Date first made open access:||08 January 2020|
Save or Share this output
|Look up in GoogleScholar|