Showing papers in "Tectonophysics in 1991"

TL;DR: The Variscan belt of Western Europe is part of a large intra-Paleozoic belt extending on both sides of the Atlantic from the Ouachitas in the US and the Mauritanides in West Africa to the Bohemian Massif in Czechoslovakia and Poland as discussed by the authors.

TL;DR: In this paper, an improved tectonic database for the South Atlantic has been compiled by combining magnetic anomaly, Geosat altimetry and onshore geologic data, which was used to obtain a revised plate-kinematic model.

TL;DR: In this article, it is argued that the South Iceland Seismic Zone is a transient feature, migrating sideways in response to propagation of the Eastern Volcanic Zone. But the authors do not consider the impact of the seismic and volcanic zones on the seafloor.

TL;DR: Davy et al. as mentioned in this paper presented an experimental method for model-enhanced lithospheric deformation based on a simplified profile of lithosphere rheology where only four layers are considered: brittle crust, ductile crust, brittle mantle and ductile mantle.

TL;DR: In this paper, the authors make simple laboratory tests on dry quartz sand and on mixtures of sand and clay and sand and cement, as determined by physical handling techniques, and the results suggest that density is determined more by handling technique than by composition, and that friction coefficients and perhaps cohesion both increase with increasing density.

TL;DR: A compilation of recognized rifts in China indicates that five distinct episodes of rifting have occurred at approximately 2.3 Ga, 1.85−1.7 Ga and 175 Ma to date as mentioned in this paper.

TL;DR: In this paper, the authors present several scale experiments of oblique rifting acting on a brittle-ductile system, where uniaxial stretching is applied oblique to the external boundaries (α = 0°, 15°, 30°, 45°, 60°, 90°).

TL;DR: In this paper, the authors presented the relevant data characterizing the pre-accretionary evolution of the Paleozoic Iberian Terranes, as well as the available evidence concerning the accretionary process itself.

TL;DR: In this paper, six thematic tectonic maps are used to analyse the makeup of the North American continent, showing that the continent evolved from an assemblage of Archean minicontinents to its present configuration.

TL;DR: In this paper, a Mesozoic tectonic model for the West African rift system is proposed, which shows a series of strike-slip fault zones diverging into Africa from the Gulf of Guinea and dissipating their shear movement into the development of extensional basins orientated perpendicular to these faults zones.

TL;DR: In this article, a variety of tectonic models have been proposed which differ in: 1) the timing of strike-parallel motions, (early or during continental accretion or late after accretion was completed); 2) the geometric pattern of strike parallel displacement zones (low-angle or high-angle); and 3) the location of orogen parallel movement zones (in outboard terranes on the subducting plate, along the suture zone or within the continental hangingwall).

TL;DR: In this article, it was shown that the presence of a large component of advective heat transfer and anomalously high basal heat flow during metamorphism is required to generate low pressure metamorphic belts.

TL;DR: In this paper, the sequence of formation and propagation of structures, as well as the evolution of crustal thickening, in the Variscan belt of northwest Spain are proposed.

TL;DR: In this article, it was shown that the Cycladic blueschists emerged from a depth of more than 50 km during the Tertiary, and that the fractured blocks of the upper plate lying above a low-angle normal fault did not rotate.

TL;DR: In this paper, the authors examined three kinds of gravitational gliding, depending on the paths followed by material particles, and concluded that divergent gliding produces an uppermost domain of strong vertical thinning, balanced by extensions in all horizontal directions.

TL;DR: In this article, the kinematic and geometric evolution of basement-controlled inversion structures has been analyzed using a plane strain sandbox apparatus, and the results of two representative scaled analogue models comprising rigid listric and planar detachment faults that both have cut-off angles of 60° to the horizontal, are described in detail.

TL;DR: In the Tunisian Atlas nothing is known about the nature of the acoustic basement, and in the Saharan cratonic part, only a few deep exploration wells have reached the Precambrian below a thick unfolded Palaeozoic sequence as mentioned in this paper.

TL;DR: In this article, the Nautile explored the western axial valley wall in the northern cell of the MARK area (Mid-Atlantic Ridge/Kane fracture zone), where peridotite and gabbro outcrops had been previously reported, in order to constrain the structure and determine emplacement mechanisms.

TL;DR: The structure of optimal prediction strategies for any convex loss function given a time-varying hazard function is described and may be regarded as a rigorous formulation and refinement of some earthquake prediction algorithms.

TL;DR: In this article, the authors suggest that strike-slip processes controlled the break-up of the Arabian plate from Africa and initiated the Red Sea Rift, and that pull-away basins were formed by nucleation of pull apart basins and massive intrusives.

TL;DR: In this article, a map of the stress pattern in and around Taiwan based on 200 earthquake focal mechanism solutions was determined by using data from Taiwan Telemetered Seismographic Network, microearthquake surveys and WWSSN.

TL;DR: In this paper, a review of some well-known continental rifts shows that rift features such as maximum basin depth are dependent on the amount of extension, whereas the initial rift width appears to be independent of the extent of extension.

TL;DR: The Neogene evolution of Sabah can be interpreted in terms of an arc-continent collision initiated during early Middle Miocene time and followed by intraplate shortening, the latter being active in this area at the present day as mentioned in this paper.

TL;DR: In this paper, the influence of basin and block tectonics is revealed in the context of major Late Proterozoic shear faults which have been rejuvenated up to the present day.

TL;DR: In this paper, the structure of the mylonite belt in the southwestern part of the Ogcheon belt has been investigated and interpreted in the light of recent radiometric data, which is composed of several en-echelon dextral shear zones relayed by compressional or extensional tectonic bridges.

TL;DR: Geochemical studies of Paleozoic granites in northern Victoria Land (NVL) and the central Transantarctic Mountains (CTM) are integrated with structural and lithologie studies into a model for the tectonic development of the Antarctic-south-east Australian Gondwana margin in late Precambrian-middle Paleozoian time as discussed by the authors.

TL;DR: The Verkhoyansk-Kolyma Mesozoides, located to the northeast of the ancient Siberian platform, form a part of a Mesozoic orogenic belt which lies between the Siberian and North American platforms, the Pacific Ocean and Arctic Ocean as discussed by the authors.

TL;DR: In this article, a new structural model for the Calabrian Arc (Southern Italy) is presented, based on a systematic analysis of basin kinematics combined with a review of the literature on basement structure.

TL;DR: The use of the Cantor's Dust method on naturally fractured materials ranging in dimension from 3 mm to 45 m in maximum dimension indicates the fractal nature of the fractures found in natural materials.

TL;DR: In this article, Isovelocity horizon contour maps and velocity transects outline a crust which broadly thickens from an oceanic crust with normal oceanic-type velocity structure to a ca. 35 km thick continental crust with a continental velocity structure, beneath the Norwegian coast.