Rift propagation in rotational versus orthogonal extension: Insights from 4D analogue models

Zwaan, Frank; Schreurs, Guido; Rosenau, Matthias (2020). Rift propagation in rotational versus orthogonal extension: Insights from 4D analogue models. Journal of structural geology, 135, p. 103946. Elsevier 10.1016/j.jsg.2019.103946

[img] Text
Zwaan_etal_2020_JSG.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (7MB) | Request a copy
[img]
Preview
Text
Zwaan_etal_2020_JSG_postprint.pdf - Accepted Version
Available under License Creative Commons: Attribution-Noncommercial-No Derivative Works (CC-BY-NC-ND).

Download (4MB) | Preview

In rift settings, extension rates often vary along strike, due to rotation about a vertical axis or Euler pole, yet tectonic modelers traditionally apply constant along-strike deformation rates. Here we compare rift development and propagation under traditional orthogonal extension versus rotational extension conditions.

The set-ups involve brittle-viscous layering and localize deformation through structural weaknesses (seeds). Our models provide first-order insights into the differences in rift development between both boundary conditions: orthogonal extension produces a rift basin with constant synchronous along-strike features, whereas rotational extension induces along-strike structural gradients, diachronous rift development causing rift propagation and the development of V-shaped basins. We observe important viscous flow associated with differential pressure gradients in rotational extension. We also describe the important effects of strain partitioning between rift axis and model boundaries, the quantifying of which is crucial to avoid incorrect model interpretations.

Although our model results are first-order only, they are in good agreement with various natural examples and previous modeling studies and highlight the importance of considering the third dimension when studying tectonic systems.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Tectonics

UniBE Contributor:

Zwaan, Frank and Schreurs, Guido

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0191-8141

Publisher:

Elsevier

Funders:

[4] Swiss National Science Foundation

Projects:

[UNSPECIFIED] 4D Analogue modelling of oblique extension: from continental rifting to passive margin formation

Language:

English

Submitter:

Frank Zwaan

Date Deposited:

25 Mar 2020 11:45

Last Modified:

29 Mar 2020 03:43

Publisher DOI:

10.1016/j.jsg.2019.103946

BORIS DOI:

10.7892/boris.142115

URI:

https://boris.unibe.ch/id/eprint/142115

Actions (login required)

Edit item Edit item
Provide Feedback