Segmentation of rifts through structural inheritance: Creation of the Davis Strait

This is a Preprint and has not been peer reviewed.

Downloads

Download Preprint

Supplementary Files
Authors

Philip Joseph Heron , Alexander Lewis Peace , Ken J.W. McCaffrey, J. K. Welford, R. Wilson, R. N. Pysklywec

Abstract

Mesozoic-Cenozoic rifting between Greenland and North America created the Labrador Sea and Baffin Bay, while leaving preserved continental lithosphere in the Davis Strait which lies between them. Inherited crustal structures from a Palaeoproterozoic collision have been hypothesized to account for the tectonic features of this rift system. However, the role of mantle lithosphere heterogeneities in continental suturing has not been fully explored. Our study uses 3-D numerical models to analyze the role of crustal and sub-crustal heterogeneities in controlling deformation. We implement continental extension in the presence of mantle lithosphere suture zones and deformed crustal structures and present a suite of models analyzing the role of local inheritance related to the region. In particular, we investigate the respective roles of crust and mantle lithospheric scarring during an evolving stress regime in keeping with plate tectonic reconstructions of the Davis Strait. Numerical simulations, for the first time, can reproduce first order features that resemble the Labrador Sea, Davis Strait, Baffin Bay continental margins and ocean basins. The positioning of a mantle lithosphere suture, hypothesized to exist from ancient orogenic activity, produces a more appropriate tectonic evolution of the region than the previously proposed crustal inheritance. Indeed, the obliquity of the continental mantle suture with respect to extension direction is shown here to be important in the preservation of the Davis Strait. Mantle lithosphere heterogeneities are often overlooked as a control of crustal-scale deformation. Here, we highlight the sub-crust as an avenue of exploration in the understanding of rift system evolution.

DOI

https://doi.org/10.31223/osf.io/6mkc8

Subjects

Earth Sciences, Physical Sciences and Mathematics, Tectonics and Structure

Keywords

rifting, spreading, mantle dynamics, lithosphere, North Atlantic, Segmentation, Davis Strait, inheritance, obliquity

Dates

Published: 2019-03-19 11:24

Older Versions
License

GNU Lesser General Public License (LGPL) 2.1

Add a Comment

You must log in to post a comment.


Comments

There are no comments or no comments have been made public for this article.