Results 21 to 30 of about 2,667 (188)

COMPOSITIONAL AND THERMAL DIFFERENCES BETWEEN LITHOSPHERIC AND ASTHENOSPHERIC MANTLE AND THEIR INFLUENCE ON CONTINENTAL DELAMINATION

Геодинамика и тектонофизика, 2015
The lower part of lithosphere in collisional orogens may delaminate due to density inversion between the asthenosphere and the cold thickened lithospheric mantle. Generally, standard delamination models have neglected density changes within the crust and
A. I. Kiselev, A. V. Ivanov, B. S. Danilov   +2 more
doaj   +1 more source

Small Shear Wave Splitting Delays Suggest Weak Anisotropy in Cratonic Mantle Lithosphere

Geophysical Research Letters, 2021
We use splitting in core‐refracted teleseismic shear waves (SKS, PKS, and similar) to investigate anisotropic properties of the upper mantle beneath the Superior craton in eastern North America and the Yilgarn craton in Western Australia.
Xiaoran Chen, Vadim Levin, Huaiyu Yuan
doaj   +1 more source

THE EVOLUTION OF THE SIBERIAN CRATON, PETROGENESIS AND DIAMOND POTENTIAL OF THE MANTLE MAGMATIC SYSTEMS

Геодинамика и тектонофизика, 2015
The article reviews the history, main scientific fields and major results of the studies performed by the Laboratory of Petrology, Geochemistry and Ore Genesis and the Laboratory of Geology and Magmatism of Ancient Platforms.
P. I. Dorogokupets, K. N. Egorov
doaj   +1 more source

MATE: An Analysis Tool for the Interpretation of Magnetotelluric Models of the Mantle

Geochemistry, Geophysics, Geosystems, 2020
Interpretation of electrical conductivity anomalies observed in magnetotelluric models provides an important opportunity to understand the nature of the lithospheric mantle and its dynamics.
Sinan Özaydın, Kate Selway
doaj   +1 more source

Mantle transect of the Karelian Craton from margin to core based on P-T data from garnet and clinopyroxene xenocrysts in kimberlites [PDF]

Bulletin of the Geological Society of Finland, 2009
Peridotitic garnet and clinopyroxene xenocrysts from the 1.2 Ga Lentiira-Kuhmo and the 760 Ma Kuusamo kimberlite fields, emplaced within the Central Karelian Craton, have been studied using major and trace element geochemistry to obtain information on ...
M. Lehtonen, H. O'Brien
doaj   +1 more source

Ukraine’s lithium pegmatites: issues and advantages of field development

Мінеральні ресурси України
Lithium contributes to development of high-tech industries around the globe. This article examines economic prospects of the Ukrainian lithium resources in the context of general trends existing on the world market.
O. I. Bilous, B. I. Slobodian, V. O. Parfeniuk   +2 more
doaj   +1 more source

A Reassessment of Petrochemistry of ~1.2 Ga Tonalitic Rocks of the Northern Tugela Terrane, Natal Metamorphic Belt, South Africa: Further Constraints on the Evolution of This Belt

Geological Journal, EarlyView.
Our petrochemical studies on ~1.2 Ga granitoids of the Natal Metamorphic Belt, South Africa, do not suggest any property similar to Phanerozoic‐style subduction‐related granitoids. Plot of Kotongweni Tonalite in Y versus Sr diagram (after Moyen 2011), note that most samples have Sr/Y < 50.
Palesa Leuta, Saumitra Misra, Thembiso O. Basupi   +2 more
wiley   +1 more source

Application of fractal analysis for quantitative assessment of critical mineral commodites (on example of Polokhivske lithium deposit)

Мінеральні ресурси України
The characteristic feature of many deposits of critical raw materials is spatial chaotic fluctuations of grades (strongly skewed and lognormal distributions, soft geological boundaries etc.), which essentially limit the use of traditional economic ...
O. I. Bilous, V. O. Parfeniuk, V. P. Bezvynnyi, B. I. Slobodian   +3 more
doaj   +1 more source

Crustal and Upper Mantle Shear Wave Velocity Structure of Botswana: The 3 April 2017 Central Botswana Earthquake Linked to the East African Rift System

Geophysical Research Letters, 2020
Rayleigh wave group and phase velocity measurements obtained from ambient noise and earthquake data at 51 broadband stations were used to construct the first 3‐D crustal and upper mantle shear wave velocity model of Botswana.
Islam Fadel, Hanneke Paulssen, Mark van der Meijde, Motsamai Kwadiba, Onkgopotse Ntibinyane, Andrew Nyblade, Raymond Durrheim   +6 more
doaj   +1 more source

Heterogeneous Exhumation Mechanisms in Neoproterozoic Collisional Metamorphism: P–T Constraints From Pelotas and Punta del Este Terranes, Southern Brazil and Uruguay

Geological Journal, EarlyView.
Petrography, thermobarometry, and pseudosection modelling reveal peak metamorphic conditions of 3–7.5 kbar and 520°C–800°C in Tonian‐Cryogenian orthogneisses of the Dom Feliciano Belt. Metamorphic field gradients of 27°C/km–39°C/km and variable exhumation mechanisms support correlation of these units as remnants of a Himalayan‐type Piratini Orogeny ...
Thaiane Niederauer‐Santos, Carla Cristine Porcher, Daniel Triboli Vieira, Edinei Koester, Diego Jaldín, Karina Luengo, Luisa Caon   +6 more
wiley   +1 more source