Identifying mantle lithosphere inheritance in controlling intraplate orogenesis

Philip J. Heron*, Russell N. Pysklywec, Randell Stephenson

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Citations (Scopus)
12 Downloads (Pure)

Abstract

Crustal inheritance is often considered important in the tectonic evolution of the Wilson Cycle. However, the role of the mantle lithosphere is usually overlooked due to its difficulty to image and uncertainty in rheological makeup. Recently, increased resolution in lithosphere imaging has shown potential scarring in continental mantle lithosphere to be ubiquitous. In our study, we analyze intraplate deformation driven by mantle lithosphere heterogeneities from ancient Wilson Cycle processes and compare this to crustal inheritance deformation. We present 2-D numerical experiments of continental convergence to generate intraplate deformation, exploring the limits of continental rheology to understand the dominant lithosphere layer across a broad range of geological settings. By implementing a “jelly sandwich” rheology, common in stable continental lithosphere, we find that during compression the strength of the mantle lithosphere is integral in generating deformation from a structural anomaly. We posit that if the continental mantle is the strongest layer within the lithosphere, then such inheritance may have important implications for the Wilson Cycle. Furthermore, our models show that deformation driven by mantle lithosphere scarring can produce tectonic patterns related to intraplate orogenesis originating from crustal sources, highlighting the need for a more formal discussion of the role of the mantle lithosphere in plate tectonics.

Original languageEnglish
Pages (from-to)6966-6987
Number of pages22
JournalJournal of Geophysical Research: Solid Earth
Volume121
Issue number9
Early online date30 Sep 2016
DOIs
Publication statusPublished - 15 Oct 2016

Keywords

  • continental rheology
  • inherited structures
  • intraplate orogenesis
  • lithosphere scars
  • mantle lithosphere
  • plate tectonics

ASJC Scopus subject areas

  • Geophysics
  • Oceanography
  • Forestry
  • Ecology
  • Aquatic Science
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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