Strain modeling of displacement-field partitioning in transpressional orogens

Correction to “Extreme crustal thinning in the Bay of Biscay and the Western Pyrenees: From observations to modeling”

“…Starting at r 5 0.6 (h 5 34 ), intrabasinal zones of steeply dipping faults develop, and strain is incompletely partitioned. We expect this from theory [Tikoff and Teyssier, 1994], but what we also see is a transition from shallower to steeper dips, with increasing obliquity and a closer spacing between faults as the strike-slip component increases [Persaud, 2004]. This was also noted in analog experiments on oblique convergence with solely basal boundary conditions [Burbidge and Braun, 1998].…”

“…These results were from analogue strain models of transpression, which in terms of strain, is the numerical inverse of transtension; therefore, these models may also apply in our case. Considering strain partitioning as the kinematic response of a deformation system to the applied boundary conditions [Tikoff and Teyssier, 1994], we test these predictions by examining how the style of deformation varies with obliquity with model setup similar to that of analogue models [Persaud, 2004].…”

Strain partitioning in front of an obliquely convergent indenter

“…6 shows also the relationship of mutual orientation between finite and instantaneous foliations (we denote this angle by µ) in the WD region. As noted by Tikoff and Teyssier (1994) the finite and instantaneous strain ellipsoids are substantially non-parallel during transpressional deformation. Fig.…”

“…The effects of oblique convergence are often examined and numerically modeled in a framework of vertical tabular zones confined by steep parallel walls (Sanderson and Marchini, 1984) which resemble weak zones confined by rigid cratons rather than reflecting oblique indentation. In transpressive zones, defined in such a way, the concept of strain partitioning into zones of simple shear deformation and domains of pure shear has become particularly popular (Tikoff and Teyssier, 1994). From observation, we know quite well the geometry of partitioned deformation and consequences for bulk strain in such zones of transpression but the mechanical reasons for strain partitioning are not yet fully understood.…”

Avaliação de métodos de quantificação da deformação finita por meio de simulações computacionais de deformação progressiva

“…De particular interesse nesse âmbito cita-se a possibilidade de confrontar os dados obtidos em zonas naturalmente deformadas com as previsões propostas pelos modelos teóricos de zonas de cisalhamento e transpressão/transtração (e.g. Ramsay & Graham 1970, Ramsay 1980, Sanderson & Marchini 1984, Tikoff & Teyssier 1994, Robin & Cruden 1994.…”