Neves, M. C. and Bott, M. H. P. and Searle, R. C. (2004) 'Patterns of stress at midocean ridges and their offsets due to seafloor subsidence.', Tectonophysics., 386 (3-4). pp. 223-242.
The effect of the seafloor subsidence on the horizontal stress field is investigated by combining the finite element method with a formulation that allows us to compute the two-dimensional (2D) horizontal stresses arising from isostatically compensated vertical loads. The topographic load created by the elevation of midocean ridges relative to old ocean floor is shown to be a significant source of ridge-parallel tensile stresses. These may predominate over the ridge-perpendicular stresses and explain observations at midocean ridge offsets such as (1) oblique normal faulting at ridge-transform intersections trending up to 60° relative to the ridge axis, and (2) nontransform offsets consisting of structures oriented at 45° relative to the ridge trend. At midocean ridge overlaps, rotation of the ridge-parallel tensile stresses favours rift propagation at more than 45° relative to the ridge trend. It is suggested that propagating rift tips that bend abruptly lead to partially unlocked offsets, and as a result large overlaps may eventually start to rotate and evolve into a microplate.
|Keywords:||Stress; Ridge-offset; Seafloor subsidence; Oceanic lithosphere.|
|Full text:||Full text not available from this repository.|
|Publisher Web site:||http://dx.doi.org/10.1016/j.tecto.2004.06.010|
|Record Created:||20 Feb 2007|
|Last Modified:||08 Apr 2009 16:27|
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