High-pressure metamorphic rocks form during subduction of Earth's crust to mantle depths at convergent plate margins. 高压变质岩是在俯冲的过程中形成的,从地壳到地幔,深度不等的聚合板块边缘。 Moreover, the geometry of the subduction zone has much influence on the location of the large event. 此外...
A convergent plate boundary where one plate sinks (subducts) beneath the other, usually because it is denser. See more at tectonic boundary. The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton...
T. Effect of solid flow above a subducting slab on water distribution and melting at convergent plate boundaries. J. Geophys. Res. Solid Earth 112 (2007). Alvarez, W. Geological evidence for the geographical pattern of mantle return flow and the driving mechanism of plate tectonics. J. ...
Arc magmas at convergent margins serve as an important avenue for assessing the source and volume of subducted sediments, and they provide a unique opportunity to study the geodynamic effects of sediment subduction in the geological past. Here we perform geochemical analysis on the Late Cretaceous–...
To quantify the effect of syn-convergent spreading, consider the situation where convergence between the São Francisco and Congo cratons generates a subduction zone along the Congo margin at 630 Ma (Fig. 4a). If we assume a spreading rate of 2 cm/y and a subduction rate of 3 cm/y, ...
Therefore, two additional filtering steps were applied in the calculation of subduction lengths and fluxes: (1) nodes with a net convergence rate below 0.2°/Ma were excluded, and (2) nodes with a convergent motion component comprising less than 20% of the total motion were excluded. ...
The subduction of spreading ridges creates a special geodynamic setting distinguished by the interference of convergent and divergent boundaries between lithospheric plates and their long-term interaction accompanied by the formation of characteristic geological complexes and structures. The available data on ...
1. Introduction Ophiolites, preserved as obducted slivers of ancient oceanic litho- sphere in Precambrian and Phanerozoic orogenic belts and on continen- tal margins, provide the most conspicuous and robust perspectives on intraoceanic divergent and convergent margin tectonics, mantle hetero- geneity,...
The FSC is an accretionary complex reflecting the history of a fossil, long-lived convergent oceanic/continental plate boundary (e.g. Suppe and Armstrong, 1972, Wakabayashi, 1990, Wakabayashi and Dumitru, 2007, Grove et al., 2008, Dumitru et al., 2010, Ernst and McLaughlin, 2012, Ukar, ...
Over the full span of the model, from 410 Ma to 0 Ma, ~93% of subduction zones are calculated to be convergent, and at least 85% of subduction zones are converging for 97% of modelled times. Our changes improve global plate and trench kinematics since the late Paleozoic and our ...