Showing papers in "Tectonophysics in 1981"

TL;DR: The Karakaya marginal sea was already closed by earliest Jurassic times because early Jurassic sediments unconformably overlie its deformed lithologies as discussed by the authors, and it was closed by collision of the Bitlis-Poturge fragment with Arabia.

TL;DR: Plumbotectonics is an attempt to model the geochemical behaviour of U, Th and Pb, among major terrestrial reservoirs in agreement with observational data as discussed by the authors, by recycling rock through the orogenic environment, a dynamically communicating upper crust, lower crust, and mantle can produce the required patterns of lead-isotope evolution.

TL;DR: In this article, an inextensive system of magnetic susceptibility anisotropy factors is suggested which is sufficient in the majority of practical applications for characterizing the magnetic fabric of rocks.

TL;DR: The structure along the Dead Sea transform (rift) is related to the motions of the Sinai and Arabia plates which border it, and to the irregularities of their boundaries as mentioned in this paper, and the structures were formed mainly during the last 40 km of slip, which probably occurred in the Plio-Pleistocene.

TL;DR: In this article, a 500 km long segment of the Dead Sea transform (rift) was studied and the authors found that left-slip faults, whose characteristic physiographic features are recognizable along most of the studied segment, bend or are stepped to the left, rhomb-shaped grabens or pull aparts are produced, forming depressions.

TL;DR: In this paper, the authors conducted deformation experiments on two dunites (Anita Bay, of 100 μm grain size, and Aheim, of 900 mm grain size) at strain rates from 10−3 to 10−6 s−1 and temperatures from 1000°C to 1300°C in a gas-medium deformation apparatus at 300 MPa confining pressure.

TL;DR: The geometry and geochronology of aseismic ridges and oceanic islands in the southern oceans provide a good test of the proposition that hotspots remain fixed over long periods of time; that is, motion of an order of magnitude less than the relative motion between plate pairs as mentioned in this paper.

TL;DR: In this article, the geometric consequences of modelling deformation histories involving pure shear, simple shear and inhomogeneous inhomogeneities are reviewed and a model is required that provides a solution to boundary discontinuities associated with bulk shortening and which can accomodate the heterogeneous and anastomosing nature of strain in rocks.

TL;DR: In this article, the authors investigate the geometries, origins, and sequence of development of structural elements comprising the strike-slip (wrench) fault zones in Indiana limestone.

TL;DR: The Baikal rift zone is a narrow seismic belt which extends further east along the Stanovoy range to the Okhotsk Sea as mentioned in this paper, and is considered as the boundary between the Eurasian and Amurian lithospheric plates.

TL;DR: In this article, a 30 km wide shear belt of subparallel faults along the western coast of the Gulf of Elat has been identified based on offsets of magmatic bodies and lithological contacts in rocks of Precambrian age and the cumulative displacement, measured independently at several localities across the belt attains a total of 24 km.

TL;DR: In this article, the authors studied the M.C.T. shear zone from the view-point of the quartz-rich rocks and used the preferred orientation study of their c-axes to predict the sense of shear for Himalayan thrusting in more than 80% of cases.

TL;DR: The present day Taupo-Hikurangi subduction system is a southward extension of the Tonga-Kermadec Arc system into a sediment-rich continental margin environment as mentioned in this paper.

TL;DR: In this article, a comprehensive suite of ultramafic inclusions was collected as part of the Basaltic Volcanism Study Project and has been analyzed by instrument neutron activation analysis for major, minor, and some lithophile trace elements.

TL;DR: In this paper, a steady-state foliation is defined as a foliation with constant orientation and intensity in a rock undergoing steadystate flow, and the problem discussed is whether such strain-insensitive foliations exist in rocks and how they might be distinguished from the more familiar, strain-sensitive foliations.

TL;DR: In this article, it is inferred that the Coimbra-Cordoba lineament could have been a suture zone which evolved into an intracontinental left-lateral shear zone during the Variscan orogeny of the Ibero-Armorican arc.

TL;DR: In this paper, the long axis of the tension gashes and stylolitic columns developed in limestones during a single phase of compressional deformation occur parallel to the direction of the maximum compressive stress (σ 1).

TL;DR: In this paper, the authors attributed the interference of a depositional magnetic fabric between cleavage surfaces with a tectonic magnetic fabric in the cleavage surface to the strength of weakly deformed rocks.

TL;DR: In this article, it was shown that the degree of coupling between intragranular deformation and particulate flow may change during the course of natural deformation, leading to a transition from controlled to dependent flow.

TL;DR: In this article, a double torsion testing method was used to obtain crack velocity (v) stress intensity factor (KI) curves, and the authors found that at low KI values the chemistry of the bulk fluid environment controlled the corrosion reaction.

TL;DR: In this paper, the average heat conductivity for various geological formations has been estimated on the basis of net rock studies by Canadian Stratigraphie Services, and observations of temperature made in "shut-in holes" in some of the oil pools have been used in heat flow estimations by the Bullard method.

TL;DR: In this article, the effects of simulated fault gouge on the sliding behavior of Tennessee sandstone are studied experimentally with special reference to the stabilizing effect of clay minerals mixed into the gouge.

TL;DR: In this article, a three-dimensional seismic structure was investigated by applying an inversion method to reveal the present and possibly the past subduction of the Philippine Sea plate beneath southwest Japan.

TL;DR: In this paper, the authors tried to strengthen the credibility of these deep-seated anomalies by drawing attention to those found where they were expected, namely, low-velocity bodies under several geothermal areas and highvelocity anomalies associated with the subducting plate.

TL;DR: In this paper, the authors identify a succession of compressional and extensional events in southwestern Anatolia and characterize the direction of corresponding regional stresses, and show that the three most important compressive phases occurred during the Miocene and a much smaller one near the Plio-Quaternary boundary.

TL;DR: The Dead Sea depression, formed by the Levanthine and Arabian plates, is occupied by three distinct sedimentary bodies, deposited in basins whose depocenters are displaced northward with time as discussed by the authors.

TL;DR: The structural setting of the Maltese Islands is governed by two rift systems of different ages and trends and the interference of both as discussed by the authors, which is one of the most spectacular phenomena of rift faulting of the world.

TL;DR: In this paper, a structural contour map of the Moho discontinuity for the Koyna reservoir area has been prepared from the present results and the crustal information obtained along the Koysi-Loni profile, which lies near latitude 18°N roughly in the east-west direction in that part of the Deccan Trap Maharashtra State, India.

TL;DR: In this paper, the authors used the distribution, microchemistry and internal structure of phases present in a slate as a basis for a discussion of the interaction between deformation and metamorphism in slates.