-
Article
Open AccessDepletion of the upper mantle by convergent tectonics in the Early Earth
Partial melting of mantle peridotites at spreading ridges is a continuous global process that forms the oceanic crust and refractory, positively buoyant residues (melt-depleted mantle peridotites). In the mode...
-
Article
Dynamic slab segmentation due to brittle–ductile damage in the outer rise
Subduction is the major plate driving force, and the strength of the subducting plate controls many aspects of the thermochemical evolution of Earth. Each subducting plate experiences intense normal faulting1–9 d...
-
Article
Building cratonic keels in Precambrian plate tectonics
The ancient cores of continents (cratons) are underlain by mantle keels—volumes of melt-depleted, mechanically resistant, buoyant and diamondiferous mantle up to 350 kilometres thick, which have remained isola...
-
Article
Open AccessHorizontal mantle flow controls subduction dynamics
It is generally accepted that subduction is driven by downgoing-plate negative buoyancy. Yet plate age –the main control on buoyancy– exhibits little correlation with most of the present-day subduction velocit...
-
Article
Plate tectonics on the Earth triggered by plume-induced subduction initiation
High-resolution three-dimensional thermomechanical simulations of Earth's lithosphere indicate that mantle plumes could have initiated the first subduction zones, but only in the hotter early Earth for old oce...
-
Article
Supercomputer simulation of continental collisions in Precambrian: The effect of lithosphere thickness
Many aspects of Precambrian tectonics are still unclear due to the undetermined influence of several key physical parameters (the temperature of the mantle, the thickness of the lithosphere, etc.) on the geody...
-
Article
Initiation of transform faults at rifted continental margins: 3D petrological-thermomechanical modeling and comparison to the Woodlark Basin
This work presents high-resolution 3D numerical model of transform fault initiation at rifted continental margins. Our petrological-thermomechanical visco-plastic model allows for spontaneous nucleation of oce...
-
Chapter
Intra-oceanic Subduction Zones
Modern intra-oceanic subduction zones comprise around 17,000 km (~40%) of the convergent margins of the Earth and are subjects of intense cross-disciplinary studies that are reviewed in this chapter. Most of t...
-
Chapter
Arc–Continent Collision: The Making of an Orogen
There is no one model, no paradigm, that uniquely defines arc–continent collision. Natural examples and modelling of arc–continent collision show that there is a large degree of, and variation in, complexity t...
-
Article
Ternary system H2O-CO2-NaCl at high T-P parameters: An empirical mixing model
New experimental data on the solubility of NaCl in gaseous CO2 were obtained at pressures (P) of 30–70 MPa and temperatures of 623 and 673 K on experimental equipment making possible to sample a portion of the ga...
-
Article
Numerical modeling of intraoceanic arc growth
We investigate crustal growth processes on the basis of a 2D coupled geochemical—petrological-thermomechanical numerical model of retreating intraoceanic subduction. The model includes spontaneous slab retreat...
-
Article
Diffusion of divalent cations in garnet: multi-couple experiments
We demonstrate the possibility of studying several diffusion couples in a single run, i.e. under almost similar P–T–t– $$ f_{{{\text{O}}_{ 2} }...
-
Article
Order/disorder phase transition in cordierite and its possible relationship to the development of symplectite reaction textures in granulites
Based on a consistent set of empirical interatomic potentials, static structure energy calculations of various Al/Si configurations in the supercell of Mg-cordierite and Monte Carlo simulations the phase trans...
-
Article
Metamorphic rocks of the Samerberg complex, Eastern Alps: 2. P-T paths and the problem of a geodynamic model
This paper continues the study of Perchuk et al. (2004), who reported a detailed petrographic description of peridotites and host gneisses composing the ultrahigh-pressure Samerberg complex. Part 2 presents th...
-
Article
P-T paths and problems of high-temperature polymetamorphism
Many Precambrian granulite-facies metamorphic complexes contain so-called straight gneisses, which are massive rocks with a clearly pronounced blastomylonitic texture, lineation, and gneissosity. These rocks o...
-
Article
Semi-empirical Gibbs free energy formulations for minerals and fluids for use in thermodynamic databases of petrological interest
The P–T partition function in statistical thermodynamics can be used to derive semi-empirical formulations of the Gibbs free energy G for minerals and fluids. Parameterization of these equations includes simultan...
-
Article
Mobility of components in metasomatic transformation and partial melting of gneisses: an example from Sri Lanka
Reaction textures, fluid inclusions, and metasomatic zoning coupled with thermodynamic calculations have allowed us to estimate the conditions under which a biotite–hornblende gneiss from the Kurunegala distr...
-
Article
P-T paths and tectonic evolution of shear zones separating high-grade terrains from cratons: examples from Kola Peninsula (Russia) and Limpopo Region (South Africa)
¶The petrology and P-T evolution of mica schists from two regional scale tectonic (shear) zones that separate high grade terrains (“mobile belts”) from cratons are described. These are the 2.4–1.9 Ga Tanaelv Belt...
-
Article
Structural-metamorphic evolution of the Southern Yenisey Range of Eastern Siberia: implications for the emplacement of the Kanskiy granulite Complex
¶The Southern Yenisey Range of Eastern Siberia consists of the granulite facies Kanskiy Complex bordered in the west by the lower-grade Yeniseyskiy and Yukseevskiy Complexes. Three deformational events were re...
-
Article
Comparative petrology and metamorphic evolution of the Limpopo (South Africa) and Lapland (Fennoscandia) high-grade terrains
¶Detailed studies of rocks from the Limpopo (South Africa) and Lapland (Kola-Fennoscandia) high-grade terrains were carried out in order to reveal similar geological and thermodynamic conditions in their forma...
