Showing papers in "Journal of Structural Geology in 1991"

TL;DR: In this article, a small well-exposed normal fault zone at Kilve, Somerset, U.K., is described, which consists of 34 individual offset and linked fault segments, and a simple model is presented which assumes different displacement gradients inside and outside the influence of relay structures.

TL;DR: In this paper, the authors explored the origin of joint spacing in the Monterey Formation of California and by one-dimensional numerical modeling based on Hobbs' theory of Joint spacing.

TL;DR: The geometry of sampling domains is a first-order consideration in the characterization of brittle fault populations as mentioned in this paper, and it has been shown that small faults accommodate a significant portion of the total strain due to the brittle faulting process.

TL;DR: The Wasatch Fault Zone (WFZ) is the longest continuous, active normal fault (343 km) in the United States and is the largest earthquake risk in the interior of the western United States as mentioned in this paper.

TL;DR: In this paper, small-scale, well exposed strike-slip fault zones near Kirkcudbright, Scotland, cut sub-vertical bedding, so that mapped bed separations allow the displacements, linkage and evolution of fault segments to be assessed.

TL;DR: In this paper, a detailed fractographic analysis of the surface features of these segments reveals several characteristics of the incremental propagation of a composite joint in the alternating siltstone and shale turbidite sequence of the Genesee Group of the Appalachian Plateau, central New York.

TL;DR: In this paper, the authors studied the distribution of surface ruptures caused by 11 historical earthquakes in the Basin and Range province of western North America and provided a basis for evaluating earthquake segmentation behavior of faults in extensional tectonic settings.

TL;DR: In this paper, Sigmoidally shaped veins and vein fillings are explicitly modeled showing that they can form in response to the mechanical interaction of neighboring fractures which redirects the propagation path.

TL;DR: In this article, a combination of mechanical and microstructural results for experimentally deformed albite aggregates of 2-10 μm grain size indicates a regime of grain boundary diffusion creep that depends upon the presence of water, temperature and strain rate.

TL;DR: In this paper, fracture mechanics are used to interpret conditions responsible for secondary cracks that adorn joints and faulted joints in the Entrada Sandstone in Arches National Park, U.S.A.

TL;DR: In this article, a simple model for shape-growth of calcite veins in a crack-seal environment is proposed to account for both tracking and non-tracking behaviors. But the tracking criteria for calcite vein growth are not tested on natural examples.

TL;DR: In this article, the authors identify four characteristics that help to identify segment boundaries: (1) major en echelon offsets or pronounced gaps in the continuity of fault scarps; (2) distinct, persistent, along-strike changes in fault-scarp morphology that indicate different ages of faulting; (3) major salients in the range front; and (4) transverse bedrock ridges where the cumulative throw is low compared to other places along the fault zone.

TL;DR: In this article, the concept of stress equilibrium and strain compatibility is used to model deformation in polycrystalline deformation, and the viscoplastic self-consistent theory is applied to mineral systems with a high degree of plastic anisotropy.

TL;DR: In this article, structural heterogeneities within neotectonic normal fault zones, fault scarps and range fronts in the Aegean region are subject to a temporally and spatially variable pattern of degradation.

TL;DR: The sub-Himalayan fold-thrust belt consists of deformed late Cenozoic and older deposits south of the Main Boundary thrust (MBT) as mentioned in this paper.

TL;DR: In this article, twin width and intensity of coarse-grained limestones of the northern Subalpine Chain (France) have been found to correlate with peak metamorphism under diagenetic and anchimetamorphic conditions.

TL;DR: In this article, the authors study the relationship between fault segmentation and the complexity of fault geometry and show that there are changes of both geometric pattern and geomorphic character in the area of the segment boundary in the Dixie Valley-Pleasant Valley fault system.

TL;DR: In this article, an E-directed, imbricate-fan thrust-system within a chevron-folded, monotonous quartz-rich turbidite succession shows marked gradients in strain from the upper to lower parts of individual thrust-sheets.

TL;DR: In this paper, a model of the deformation of the North Mountain thrust sheet of northern Virginia is presented, where a transport-parallel pure and simple shear is applied during the major transport episode, and after thrust sheet imbrication.

TL;DR: The structural style of Timor is consistent with foreland fold belt processes, and zones of frontal accretion and underplating can be recognized in the Australian parautochthonous sequence as discussed by the authors.

TL;DR: In this paper, the Sierras Australes (Buenos Aires province, Argentina) form a sigmoidal foldbelt, about 150 km long, which is associated with cleavage, stretching lineation and kinematic indicators.

TL;DR: In this paper, it was shown that strain energy may not be a major contributor to the advance of the myrmekite colony. But, strain energy probably contributes indirectly by facilitating access of fluids to growth sites, thereby altering the local chemical environment and so promoting development of mymekite.

TL;DR: The Miocene structural evolution of the metamorphic complex on Naxos occurred within a mid-to lower crustal, sub-horizontal shear zone as discussed by the authors, and the deformation style and the regional stress field in the Aegean during the Miocene are consistent with exhumation during ductile crustal thinning.

TL;DR: In the High Tatra Mountains (N. Slovakia), the magnetic fabrics are deformational in origin in sedimentary rocks of the Križna nappe as discussed by the authors.

TL;DR: In this paper, a series of experiments were undertaken to investigate the development of faults in a cover sequence overlying a reactivated basement fault with oblique-slip, showing that any deformation that is localized along discrete faults at the basement level becomes distributed over a much wider zone of overburden when this overlies an interval of evaporites.

TL;DR: In this article, a 30 km long profile, extending from 3 million year-old Pleistocene rocks to the Holocene rocks of the rift zone in southwest Iceland, is dissected by 443 dikes and 156 normal faults.

TL;DR: In this article, compositional changes in mylonitic rocks from the central Mojave metamorphic core complex, California, indicate that large volume loss (20-70%) attended formation of mylonite along the Waterman Hills detachment fault.

TL;DR: In this paper, the principal stresses that control the formation of ductile deformation patterns are linked to the stretch and rotation components of plane isochoric deformation in isotropic rocks.

TL;DR: In this article, the authors use laboratory-determined, low-temperature frictional sliding data, together with power-law equations for steady-state creep of rocks at high temperatures, to construct inferred profiles of rock strength and mode of failure with depth in the lithosphere.