Showing papers in "Journal of Structural Geology in 1988"

TL;DR: In this article, the authors derived an expression relating width, displacement and material properties of a single fault surface, and used this expression to derive a growth model for a single slip event, where width is proportional to the square root of displacement.

TL;DR: In this article, the relationship between thickness and displacement for different types of deformation zones in quartz-of-eldspathic rocks is investigated and a linear correlation of thickness with displacement and an average displacement/thickness ratio of 63 is found.

TL;DR: In this paper, a high-grade metamorphic rock pile (Variscan Vosges Massif, France) underwent subhorizontal shearing during partial melting and further solidification, and layered migmatites and homogeneous granites were variously deformed in the partially melted and solid states.

TL;DR: Extensional relay structures are described as offset listric faults having the same subhorizontal detachment in depth as mentioned in this paper, and the extension along one fault is transferred or relayed across a relay ramp defined between the tip-lines of the offset faults.

TL;DR: In this paper, the odd-axis model and the Reches model were applied to an array of orthorhombic faults in the northern San Rafael Swell of central Utah with excellent agreement between predicted and observed geometric and kinematic parameters.

TL;DR: In this paper, the internal geometry and detachment of Coulomb thrust wedges were examined in a combined gravity and pressure force field under various boundary conditions and Coulomb parameters, and the taper of cohesive Coulomb wedges was consistent with the critical cohesionless Coulomb wedge taper, only when the cohesive length scale was lr ∼ Sr/ϱrar ≤ 10−6.

TL;DR: In this article, the authors used an experimental geometry, which includes a slot loaded to produce a mode 3 shear stress concentration, for the formation of brittle shear fracture in two fine-grained rock types.

TL;DR: The timing of motion on major thrusts in the Western Himalaya shows an extremely complex sequence that spans approximately 70 Ma from the latest Cretaceous throughout the Tertiary.

TL;DR: Normalization of center-to-center distances allows more precise determination of small initial and tectonic anisotropies in packed aggregates as mentioned in this paper, which shows that normalized Fry diagrams form better defined vacancy fields and sharper rims of maximum point density regardless of the original sorting.

TL;DR: In this article, the authors show that the absolute amplitude of the observed vertical motions can be approximately modelled by planar rotating normal faults that impose a saw-tooth topography on a regional subsidence caused by crustal and lithospheric thinning.

TL;DR: In this paper, an analytical solution for the stress field around a single joint subject to a combination of opening (Mode I) and anti-plane shear (Mode III) loadings is given.

TL;DR: In this article, a detailed 1:60 scale mapping of the Fort Foster Brittle Zone in the mylonitic Rye Formation of southernmost Maine has revealed the intricate internal duplex structure of a system of probable Paleozoic-age dextral strike-slip faults that have produced abundant pseudotachylyte and minor breccia.

TL;DR: In this paper, the authors show that these faults are segmented, and that they formed through the linkage of smaller (previously independent) faults, and (or) by propagation of a single fault affected by the existence of barriers.

TL;DR: In this article, the authors consider the concept of a composite foliation and use it to evaluate the significance of different sets of structures in the evolution of larger rock masses, and suggest that structural elements be labeled using morphological notation, adding numerical subscripts only when independent evidence is available.

TL;DR: In this article, a simple model consisting of two components, a homogeneous strain and a heterogeneous simple shear, is presented as strain refraction across competence contrasts and strong changes in ellipsoid size, shape and orientation are predicted across viscosity contrasts.

TL;DR: In this article, microstructural observations of naturally faulted granitic gneisses show that feldspar grains are weaker than quartz grains at temperatures below 325γC and at depths of less than 8-10 km.

TL;DR: In this article, an application of the Mohr diagram for stretch is presented, which can be used with poorly constrained data on stretch and rotation of lines to construct the best fit to the position gradient tensor; this tensor describes all deformation parameters.

TL;DR: In this article, the authors present evidence for the existence of three fundamental mechanisms by which thrust sheets move: failure of a stiff layer, forming ramp-flat geometry (imbricated thrust sheets), detachment of a layer by folding (decollement) and differential layer-parallel shortening (LPS) thrust sheets.

TL;DR: In this article, the declinations of the primary magnetization of sedimentary rocks in the northern part of the New Zealand plate-boundary zone, after thermal or alternating field cleaning, have been used to determine tectonic rotations about vertical axes of rigid crustal blocks.

TL;DR: In this article, a series of scale-experiments were conducted to generate listric normal faults by extending models composed of colored sand layers deposited at regular time intervals throughout deformation during syntectonic sedimentation.

TL;DR: In the study of deformed sedimentary rocks, it is important that the cause of the deformation and the timing of deformation relative to metamorphic and tectonic events be assessed as discussed by the authors.

TL;DR: In this article, the deformed distributions of sedimentary fabrics are analyzed using a stereonet with great circles only or small circles only, and a new orientation net which is as convenient to use in the field as a standard stereonet.

TL;DR: In this paper, the main shear sense of the ophiolite nappes and of the overlying basement Nappes in Northern Calabria is from west to east, in today's co-ordinate system.

TL;DR: In this paper, a new method for determining the sense of shear in plagioclase-bearing tectonites from the (010) orientation of plagiocase feldspar is presented.

TL;DR: In this article, a new mechanism for the origin of asymmetric boudins in shear zones is proposed based on work along a major mylonite zone in the northern Appalachians and scale model studies.

TL;DR: In this article, experiments on rock analogues are described which establish that certain microstructures (diamond grain structures, tabular grain structures and asymmetric grain-boundary bulges) can be used to determine whether deformation was coaxial or non-coaxial.

TL;DR: In this paper, the role of dynamic recrystallization and lattice rotations in fabric development is investigated, and it is found that these fabrics can evolve significantly with progressive strain from one strong fabric pattern to another.

TL;DR: In this paper, the magnetic fabric ellipsoid rapidly spins so that the maximum and intermediate susceptibilities tend to become parallel to the shear zone walls throughout the sheared zone.

TL;DR: The 1982-1983 surge of Variegated Glacier involved the development, growth and downglacier propagation of a velocity peak associated with rapid basal sliding facilitated by high subglacial water pressures as mentioned in this paper.