Showing papers in "Tectonophysics in 1990"

TL;DR: The active collision between the Luzon arc and the Asian continent in the Taiwan area is investigated in terms of plate kinematics and geological records in this article, where the collisional history can be interpreted from the stratigraphy of the Coastal Range and the Western Foothills and from the diastrophism of the Central Range of Taiwan.

TL;DR: In this article, a set of seven reliability criteria has been applied to a previously published Phanerozoic paleopole database for Europe and North America and a Late Precambrian data set for Africa.

TL;DR: In this paper, a compilation of these rocks in many subduction complexes of Late Permian to the present, led to following conclusions: the major process for landward accretion of oceanic materials is not offscraping or sedimentary mixing at the trench, but underplating (subcretion) at much deeper levels of a subduction zone.

TL;DR: Yangzi-Nanpanjiang and Gunanhai orogenic belts as mentioned in this paper are composed of three continental fragments: Yangzi, Huanan, and Dongnanya.

TL;DR: A new subdivision of the pre-Permian rocks of the Bohemian Massif into terranes is based on recent structural, kinematic and radiometric studies and on a comparison with the French Variscan Belt.

TL;DR: The Betic Cordilleras are characterized as having been deformed by regional horizontal shortening (compression) oriented WNW-ESE or NW-SE, which gradually rotated to the NNW-SSE in the Late Miocene, when its most important intramontane Neogene basins were formed.

TL;DR: In this paper, the authors used isotopic and geochemical data from Mesozoic and younger granitoids and sediments to place constraints on the tectonic evolution of Southeastern China and evaluate whether the young Phanerozoic foldbelts are representative of old rejuvenated landmass, whether they characterize crustal accretion through successive subduction processes, or whether they represent some intermediate situation.

TL;DR: A unified framework for the description of recrystallization mechanisms is proposed in this paper, which can be divided into three main types: rotation mechanisms, migration mechanisms, and general mechanisms which involve both basic processes.

TL;DR: A detailed aeromagnetic survey carried out in the Newfoundland Basin shows well developed seafloor spreading anomalies 24 to 34 as discussed by the authors, which has been interpreted as arising from shifts in the plate boundary between Africa and Eurasia during the time when Iberia was moving as part of the African plate.

TL;DR: In this article, a simple graph relating elevation to lithosphere density and thickness provides an overview of expectable conditions around the earth and a simple test for consistancy of continental and oceanic lithosphere models.

TL;DR: The most extensive work on the mafic Pikwitonei and felsic Adirondack granulites has been done by as mentioned in this paper, where they have been deformed to ca. ~10% strain at confining pressures of 0.8-1.0 GPa, temperatures of 600-900°C, and constant strain-rates of 10−4−10−7 s−1.

TL;DR: The Junggar basin has been interpreted as either a mid-Carboniferous ocean basin or a back-arc basin bounded by emergent volcanic arcs south of the Siberian Craton as mentioned in this paper.

TL;DR: A chronostratigraphic framework for the rock units involved in the Vredefort event, from the basement rocks at ∼ 3170 Ma to the Waterberg-Soutpansberg Groups deposited between ∼ 2025 and 1425 Ma, is presented in this article.

TL;DR: In this article, Zhang et al. reported new results from their own paleomagnetic studies of the Inner Mongolia autonomous region in northeastern China and the Xinjiang autonomous regions in northwestern China, which suggest a tectonic model in which Kazakhstan, Europe and Siberia collided with each other in Late Permian time.

TL;DR: In this article, a model of dike emplacement at divergent plate boundaries is developed which predicts that below the uppermost 1-3 km of the oceanic crust, the number and lengths of dikes in any particular swarm should increase, but that the thickness should decrease, with depth in the crust.

TL;DR: In this paper, a large-scale extensional shear zone is described from the Mont Pilat area in the northeastern part of the French Massif Central, which is characterized by well-developed N-dipping foliation and stretching lineations.

TL;DR: In this paper, the authors used both instrumental and historical data for 36 seismic sources of shallow and intermediate depth earthquakes in the Aegean and surrounding area (34°N-43°N, 18°E-30°E) and found that shallow seismic activity is highest along the convex side of the Hellenic arc but close to the coast.

TL;DR: In this article, the authors interpret the Central Cordillera, in which basement rocks are thrust over Miocene sediments on both sides, as a pop-up of crustal scale, elevated above downward-flattening faults that dip towards each other and merge into a single deep detachment.

TL;DR: The Montagne Noire is interpreted as a Variscan metamorphic core complex composed of: (1) an uplifted core of assumed Proterozoic gneisses and migmatitic rocks associated with anatectic granites related to a late Hercynian LP/HT metamorphism and (2) an upper plate composed of low-grade or non-metamorphic folded Palaeozoic sediments as mentioned in this paper.

TL;DR: In this article, the Variscan Foix granite (40 km 2 ; Central Pyrenees) was subjected to detailed microstructural, magnetic susceptibility and anisotropy studies.

TL;DR: In this article, a comprehensive model is presented which can explain temporal fluctuations in seismic b-values in the period leading to mechanical failure in terms of the underlying physical processes of time-varying applied stress and stress corrosion-enhanced crack growth under conditions of constant strain rate.

TL;DR: In this article, a marine Seismic acquisition system that has been calibrated using deep-water sea-bottom multiples was used to estimate normal incidence reflection coefficients for the brightest of these reflections.

TL;DR: In this article, the authors studied the local breakdown near a propagating crack-tip during slip failure nucleation and its transition process to unstable rupture under mode II conditions using a rock sample with a simulated fault, which is large compared with the size of the breakdown zone.

TL;DR: The Besshi nappe complex was tectonostratigraphically represented by the Oboke and structurally overlying Besseshi nappa complexes in central Shikoku, Japan, and whole-rock schist samples from low grade Oboke units record intermediate temperature as discussed by the authors.

TL;DR: In this article, the evolution of faunal assemblages and climatic characteristics from the Cambrian up to the end of the Devonian, demonstrates that Baltica and North Gondwana represent two major and independent palaeogeographic entities separated by a mid-European Rheic Ocean which opened as early as the Cambric and closed progressively from the devonian.

TL;DR: The earliest tectonothermal event occurred at 490-480 Ma and corresponds to the emplacement of LREE-enriched magmas of probable calc-alkaline affinity and their metamorphism in the granulite facies.

TL;DR: In this article, the authors focus on a simple theory of electroseismic activity based on mechano-electrical transduction effects such as the piezoelectric or the pressure-induced polarization effect.

TL;DR: The Ogcheon Belt is a stack of synmetamorphic southeastward verging nappes resulting from the deformation of a volcanosedimentary sequence deposited in an early Palaeozoic rift which was affected by polyphase tectonics as discussed by the authors.

TL;DR: Tektites are generally small, black, rounded, silicate glass bodies found scattered over several widely separated areas of the Earth's surface called strewn fields, which are known as Muong Nong-types as mentioned in this paper.

TL;DR: In this article, the age and kinematics of the Pogallo Ductile Fault Zone are consistent with the occurrence of Early Mesozoic extensional basins in the Southern Alpine sediments.