Results 171 to 180 of about 3,614 (211)
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Mantle sources of Permian-Triassic Siberian traps (West Siberian Plate and Siberian craton)
Russian Geology and Geophysics, 2008Abstract We investigate the dynamics of multilevel subcontinental melting beneath a lithosphere of variable thickness as a model simulating generation of melts that produced flood basalt in the Siberian Trap province. The inferred sequence of volcanic events correlates with upper mantle decompression melting above hotspots and related ...
V.N. Sharapov +3 more
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Paleomagnetism of the Ulkan trough (Southeastern Siberian Craton)
Russian Journal of Pacific Geology, 2013The first results of the paleomagnetic study of one of the key Paleoproterozoic objects of the Aldan-Stanovoy Shield (the Ulkan trough) in the Bilyakchan-Ulkan volcanoplutonic belt are presented. The volcanosedimentary rocks of the Elgetei Formation and the granites of the Ulkan Complex were studied.
A. N. Didenko +4 more
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TEM-TDEM soundings in the eastern Siberian craton
Russian Geology and Geophysics, 2008Abstract We report forward modeling results for transient magnetic fields excited by horizontal electric or vertical magnetic dipoles. Modeling was performed with reference to resistivity patterns typical of platform areas in East Siberia.
G.M. Morozova, E.Yu. Antonov
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Antiquity of peridotitic diamonds from the Siberian craton
Earth and Planetary Science Letters, 1997Abstract Diamonds erupted by kimberlites traversing ancient continental tectosphere [1] provide a window into the evolution of continents and their mantle keels. However, the vintage of this window; that is, the timing of crystallization of peridotitic mineral inclusion-bearing diamonds beneath different cratons, has proved controversial because of ...
S.H. Richardson, J.W. Harris
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Paleoproterozoic, High‐Metamorphic, Metasedimentary Units of Siberian Craton
Acta Geologica Sinica - English Edition, 2009Abstract:Sensitive, high‐resolution ion microprobe zircon U–Pb ages of Paleoproterozoic, high‐grade, metasedimentary rocks from the south‐western part of the Siberian Craton are reported. Early Precambrian, high‐grade complexes, including garnet–biotite, hypersthene–biotite, and cordierite‐bearing gneisses compose the Irkut terrane of the Sharyzhalgay ...
Lena URMANTSEVA, Olga TURKINA
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Density heterogeneity of the cratonic lithosphere: A case study of the Siberian Craton
Gondwana Research, 2015Using free-board modeling, we examine a vertically-averaged mantle density beneath the Archean–Proterozoic Siberian Craton in the layer from the Moho down to base of the chemical boundary layer (CBL). Two models are tested: in Model 1 the base of the CBL coincides with the LAB, whereas in Model 2 the base of the CBL is at a 180 km depth.
Cherepanova, Yulia, Artemieva, Irina
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Middle Paleozoic kimberlite magmatism in the northeastern Siberian craton
Doklady Earth Sciences, 2016The mineral chemistry and crystal morphology of kimberlite pyropes from the Billyakh River placer in the northeastern Siberian craton are characterised in terms of the placer history. The pyropes bear signatures of chemical weathering (dissolution), presumably in a Middle Paleozoic laterite profile, and therefore were originally hosted by Middle ...
E. O. Egorova +2 more
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Seismotectonic Activation of Modern Structures of the Siberian Craton
Geotectonics, 2018Our research of the modern structures of Siberian Craton aims to reveal regional regularities in the seismotectonic destruction of the Earth’s crust and to clarify the dynamics of the formation of the focal zones of strong earthquakes. Analysis of activated structures and marginal suture zones located in the study area was based on structural and ...
L. P. Imaeva +2 more
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Sayan–Biryusa Volcanoplutonic Belt (Southern Siberian Craton): Age and Petrogenesis
Russian Geology and Geophysics, 2019Abstract —Geological, geochronological, and geochemical isotope studies are carried out for metamorphosed volcanic rocks and dolerites of the Maltsevka sequence of the Elash Group in the Biryusa block of the Siberian craton. It is found that mafic igneous rocks (dolerites and basaltic andesites) are close in composition to intraplate ...
T.V. Donskaya +5 more
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Recommendations for Geophysical Studies of the Siberian Craton Basement
Proceedings, 2014Hydrocarbon accumulations in the basement rocks found in the North American (U.S., Mexico), South American (Colombia, Brazil, Venezuela), the African-Arabian (Libya, Morocco, Egypt), East European (Yugoslavia, Hungary, Ukraine, Austria ), South China (China), Indochina (Vietnam) platforms, the West Siberian (Russia) and the Western European plate ...
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