Russian Geology and Geophysics
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Depth differentiation of the Middle Ordovician graptolite and trilobite complexes of Gorny Altai
Russian Geology and Geophysics - Tập 58 - Trang 711-726 - 2017
Abstract A biostratigraphic analysis of the Middle Ordovician reference sections
of northeastern Gorny Altai is carried out. We study complexes of pelagic
graptolites and benthic trilobites from the Dapingian–Darriwilian Tuloi and
Karasu Formations. For the first time for the Late Paleozoic sedimentary basins
of Siberia, lithofacies and biofacies analyses of the sedimentary successions
and associa...
Vertical zoning of oil and gas formation: historico-genetic aspects
Russian Geology and Geophysics - Tập 50 - Trang 327-333 - 2009
Abstract Considerable variations in depth zoning of dispersed organic matter
(DOM) catagenesis are caused by various physical and geological factors. The
evolution of a sedimentary basin (SB) implies successive changes in organization
levels of this system. In the process of evolution the system structure is
determined by the interaction of its subsystems. Any parameter of an SB
(physical properti...
Change in the viscosity of kimberlite and basaltic magmas during their origin and evolution (prediction)
Russian Geology and Geophysics - Tập 56 - Trang 885-892 - 2015
Abstract Based on the analysis of experimental data on the viscosity of mafic to
ultramafic magmatic melts with the use of our structure–chemical model for the
calculation and prediction of the viscosity of magmas, we have first predicted
that diamond-carryihg kimberlite magma must ascend from mantle to crust with
considerable acceleration. The viscosity of kimberlite magma decreases by more
than ...
Reconstructions of long-term ground surface heat flux changes from deep-borehole temperature data
Russian Geology and Geophysics - Tập 55 - Trang 1471-1475 - 2014
Abstract Based on analysis of geothermal data from the Ural superdeep borehole
(SG-4) and Onega parametric borehole, the first reconstructions of ground
surface heat flux changes for the last 40 kyr have been made. The increase in
heat flux during the Pleistocene–Holocene warming (20–10 ka) proceeded ~ 2 kyr
earlier than the growth in surface temperature; reaching the maximum value of
0.08–0.13 W/...
Quality of chrysotile asbestos and high-temperature conductance of the host ultramafics: possible linkage
Russian Geology and Geophysics - Tập 48 - Trang 857-862 - 2007
Abstract The paper reports physical, physicochemical, and
mineralogical-petrographic studies of serpentinite samples from the Bazhenovo
deposit of chrysotile asbestos. The samples differ in mineralogy, physical and
physicochemical parameters, and in quality (fiber tenacity) of the hosted
chrysotile asbestos. The experiments allowed estimating the temperature
dependence of electrical resistance of ...
Ta Nang gold deposit in the black shales of Central Vietnam
Russian Geology and Geophysics - Tập 56 - Trang 1414-1427 - 2015
Abstract The Ta Nang gold deposit is localized in Middle Jurassic black shales.
The ore zone is a series of layer-by-layer crush zones and zones of hydrothermal
rock alteration, ≤10 m in thickness and >2 km in length. It consists of
quartz–sulfide veins, sulfidized black shales, and their hydrothermally altered
varieties. Sulfide mineralization occurs as two assemblages: early
pyrite–arsenopyri...
Relationship of the seismic activity of the Tuvinian and adjacent Mongolian areas with the fractal dimensionality of a fault system
Russian Geology and Geophysics - Tập 48 - Trang 593-597 - 2007
Abstract Using GIS technologies, we carried out a complex spatial analysis of
the seismic activity and fractal dimensionality of fault fields in the Tuvinian
and adjacent Mongolian areas. Results obtained showed that seismic activity is
intrinsic to zones with the low fractal dimensionalities (1.2–1.4) of fault
systems.
Fracture in heterogeneous materials: experimental and theoretical studies
Russian Geology and Geophysics - Tập 58 - Trang 738-743 - 2017
Abstract The kinetics of fracture in stressed heterogeneous materials is
investigated in a differentiated way using the parameter Δt, the interval
between single or multiple (cooperative) microfracture events recorded by
acoustic emission (AE) responses. The patterns of fracture nucleation and
growth, which is a statistic process, are controlled by the heterogeneity of
deforming material. There ar...
Genesis of scapolite from granulites (lower-crustal xenoliths from the Pamir diatremes): results of study of melt inclusions
Russian Geology and Geophysics - Tập 52 - Trang 1319-1333 - 2011
Abstract The results of mineralogical and thermobarogeochemical studies of
lower-crustal xenolith of scapolite-bearing granulites from the
fergusite-porphyry diatremes pipes in Southeastern Pamir (Tajikistan) are
presented. All minerals (including garnet, clinopyroxene, and scapolite) of
these granulites contain primary melt inclusions, which were studied using
thermometric and microprobe methods ...
Evaluation of present-day deformations in the Amurian Plate and its surroundings, based on GPS data
Russian Geology and Geophysics - Tập 57 - Trang 1626-1634 - 2016
Abstract We analyze recent crustal movements, based on data of GPS measurements
on the Amurian Plate and its margins. Most of the velocities were borrowed from
scientific publications. Also, our new and updated data of periodic and
permanent GPS observations are presented. A continuous field of strain rates has
been constructed using the combined field of movement velocities. Dilatation
rates and ...
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