Showing papers in "Tectonophysics in 1985"

TL;DR: The role of salt in fold-and-thrust belts is discussed in this article, where it is shown that salt can provide an extremely weak horizon within which a basal detachment can form and along which only a relatively small shear traction can be supported.

TL;DR: In this paper, a new faultplane solution map of the Italian peninsula is presented in the period 1905-1980, with magnitudes ranging 4-7, 75 earthquakes are located in the crust, while 31 are related to the deep and intermediate zone of the Calabrian arc.

TL;DR: In this article, the authors focus on the deformation processes and rheologies of rocks at high temperatures and high effective pressures, conditions that are presumably appropriate to the lower crust and upper mantle in continental collision zones.

TL;DR: The geotherm is consistent with high measured heat flows and with the low magnetic signature of the region as shown by MAGSAT data as discussed by the authors, suggesting that a similar thermal regime has characterized parts of this region at various times from the Permian to the present.

TL;DR: The permeability of partially serpentinized peridotites has been measured near room temperature and found to be in the range of 10−11 to 10−12 darcys or 10−7 to 10 −8 cm2 sec−1, comparable to shaley materials as discussed by the authors.

TL;DR: In this paper, the authors investigated the crustal and upper mantle compressional-wave velocity structure across the southwestern Arabian Shield by a 1000 km-long seismic refraction profile, which was used to analyze amplitude-normalized record sections.

TL;DR: The extrusive products of a Middle to Late Jurassic volcanic event occur throughout a wide area of southern South America and are associated in time and space with a series of NNW-trending grabens as discussed by the authors.

TL;DR: In this article, the authors studied the thermal models of the Tohoku (northeast Japan) subduction zone and showed that low heat-flow values ranging from 20 to 50 mW/m2 are distributed between the trench and aseismic front and consistently high heat flow values (80 −120 mW /m2) prevail in the area landward of the volcanic front including the Japan Sea.

TL;DR: The convergent stresses in the Japan Sea may be due to India-Eurasia collision and its associated intra-plate or inter-microplate movements in East Asia as discussed by the authors.

TL;DR: A marine geophysical survey in early 1982, conducted by the Australian Bureau of Mineral Resources, indicated that much of Prydz Bay is underlain by a sedimentary basin this article.

TL;DR: Eldredge and Van der Voo as mentioned in this paper studied the effect of orocline bending in the change of declination as a function of the tectonic setting.

TL;DR: In this paper, the authors show that the presence of a large topographic feature on the subducting plate may affect the stress state in the are by increasing the amount of decoupling between the two plates.

TL;DR: The plagioclases exhibit a good crystallographic preferred orientation which is compatible with (010) [001] being the principal slip system as mentioned in this paper, which is due to the fact that most dislocations in Plagioclase are dissociated.

TL;DR: In this article, a review of the geological evidence and shallow seismicity of the central New Hebrides showed that radiant horizontal stresses resulting from this collision have generated a specific compressive stress regime which influences the whole width of the arc.

TL;DR: In this article, a brittle regime of physical conditions is inferred for the Punchbowl fault, in which only brittle conditions and cataclastic deformation mechanisms prevailed, and the results indicated that the brittle regime was optimal for the fault.

TL;DR: In this paper, a combined analysis of the recently collected aeromagnetic data from the Eurasian Basin with the magnetic data of the Labrador Sea, the Norwegian-Greenland Sea, and the North Atlantic yields a plate kinematic solution for the EurasIAN Basin which is consistent with the solution for North Atlantic as a whole.

TL;DR: The first indication of a complete closure between South America and the Antarctic Peninsula is at anomaly 28 time (64 Ma) as the two continents are now configured as discussed by the authors, and the amount of closure does not change greatly, and the small computed overlap can be explained by minor uncertainties in the rotation poles used for the reconstructions or some slight extension between East and West Antarctica.

TL;DR: In this paper, the motions of two particle shapes, one a prolate spheroid, the other a triaxial ellipsoid, are considered in parallel for four specified flow geometries which involve pure or simple shear and combinations of both.

TL;DR: In this article, the authors reviewed the arguments justifying the revised timing of breakup between Australia and Antarctica and the reconstruction of broken ridge and Kerguelen Plateau with respect to new subsidence data.

TL;DR: In this article, transmission electron microscopy (TEM) was used to investigate hyalomylonites from Langtang (Nepal) and Kofels (Otz Valley, Austria).

TL;DR: In this paper, the authors show that if return flow occurs in a mantle of viscosity 10 22 poise, comparable to the results from glacial rebound studies, the predicted basal drag is too high unless a thin asthenosphere with viscosities less than 10 19 to 10 20 poise (depending on flow depth).

TL;DR: The Xigaze ophiolite (Tibet) displays unusual lithological, petrological, textural, and structural characteristics as discussed by the authors, and it was formed in a small basin located at the southern margin of Eurasia, hence within a preexisting oceanic lithosphere.

TL;DR: In this paper, a tentative seismotectonic model of the Northern Apennines is discussed, which is based on the structural evolution and crustal structure, in which the earthquake distribution can find a coherent framework.

TL;DR: The Central Volcanic Region is an area of Quaternary volcanism and tensional tectonics within the North Island of New Zealand that appears to be a direct continuation of a young oceanic back-arc basin into the continental structure as mentioned in this paper.

TL;DR: The definition of the continent-ocean boundary at passive continental margins has proved to be an elusive task as discussed by the authors, and even the relatively direct method of seismic refraction experiments has yielded results that cannot always be interpreted unequivocally.

TL;DR: In this article, a modified and updated catalogue for the large and damaging earthquakes affecting Turkey has been prepared to provide a base for the spatial correlation of the seismic activity with the geo-tectonic elements.

TL;DR: In this article, the authors estimate flow stresses from unbound dislocation densities and dynamically recrystallized grain sizes in the tectonite specimens in the Betic Movement Zone (Betic Cordilleras, Spain).

TL;DR: In this paper, the authors presented a solution for one earthquake with magnitude 5 and epicentre at the Nazare submarine canyon, where the Messejana fault joins with the Azores-Gibraltar fault.