Characteristics of continental rifting in rotational systems: New findings from spatiotemporal high resolution quantified crustal scale analogue models

نویسندگان

چکیده

Continental rifts are the expression of regional horizontal stretching and in modelling studies often assumed to be result orthogonal or oblique extension. However, naturally occurring V-shaped rift geometries infer an underlying rotational component, resulting a divergence velocity gradient. Here we use such analogue models rifting settings investigate quantify effect gradient on normal fault growth propagation towards rotation pole. Particularly, apply different velocities brittle-ductile ratios simulate crustal configurations analyse its surface deformation. Surface deformation is captured using stereoscopic 3D Digital Image Correlation, which allows for quantifying topographic evolution displacement including vertical displacement. In combination with X-Ray computed tomography, gain insights into three-dimensional structures our two-layer models. Based models, present novel characterisation under extension described by 1) early stage bidirectional stepwise length linkage pulses high rates followed longer continuous unidirectional linear growth; 2) segmented activity promotes strain partitioning among competing conjugate faults 3) along-strike migration active faulting from boundary inwards intra-rift allowing generations simultaneously over entire length. For higher velocities, inward delayed but other first-order observations similar lower velocities. Our quantitative analysis provides spatiotemporal rifting. Although natural complex systems, may contribute better understanding component.

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ژورنال

عنوان ژورنال: Tectonophysics

سال: 2022

ISSN: ['1879-3266', '0040-1951']

DOI: https://doi.org/10.1016/j.tecto.2021.229174