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Browsing ELibrary by Title
Now showing items 13631-13650 of 21934
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(1988)We found about 50 gold grains in the heavy fraction obtained by dissolving large-volume samples of serpentinized and carbonatized kimberlite from the Mir pipe. Many of them were full of inclusions of other phases. These ...
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(1990)Researchers have found the microfossils of the genus Obruchevella Reitlinger, 1948 to be an extremely interesting group of very old microorganisms. Because of their characteristic helical structure, they are easy to identify ...
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UNUSUAL ROCKS AND MINERALISATION IN A NEW CARBONATITE COMPLEX AT KANDAGUBA, KOLA PENINSULA, RUSSIA (2001)The paper presents the results from a reconnaissance investigation of carbonatites in a newly discovered alkaline complex in the Kola peninsula, Russia. The Kandaguba complex differs from other carbonatite plutons of the ...
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(2001)The formation of traces of a magnetic phase with a Curie point of 470–475 °C is detected during routine thermomagnetic analysis of various haematite types without significant isomorphous substitution. Using heating and ...
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(2002)The discovery of crude oils and condensates at ever higher temperatures casts doubt on the validity of the usual geochemical modelling approach, that uses empirical reactions and rate constants. The solution used to account ...
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(2002)Vertical tectonic movements often change the structural style and physico-chemical habitat of sedimentary basins. Changes in pressure, temperature and salinity of the groundwater caused by tectonic uplift may result in the ...
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(2002)A new Late Cambrian trilobite–brachiopod fauna from the Kurchavinskaya Formation, Severnaya Zemlya, northern Siberia, allows correlation of the Ketyi Horizon of the NW Siberian succession with the praecursor Zone of the ...
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(1998)This paper presents a new detailed ammonite-based biostratigraphic zonation of the Upper Cretaceous in eastern Central Asia and substantially refines the previous scales. Two units were established in the lower Cenomanian: ...
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(2002)The Upper Cretaceous sequence in the east of the Lesser Caucasus, within the Azerbaijan territory, begins with the Cenomanian terrigenous sediments that are overlain with a hiatus by thick volcanogenic-terrigenous deposits ...
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(1994)Maastrichtian tuffaceous sandstones and siltstones were sampled from four sites in the northern part of Shikotan Island in the Lesser Kuril Islands. A characteristic component (ChRM) isolated from most samples passes the ...
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(2003)Time-stratigraphic patterns of stable carbon isotopic ratios recorded in terrestrial organic matter from Cenomanian-Maastrichtian successions for the Russian Far East can be correlated to those of carbonate carbon from ...
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(2004)Time-stratigraphic patterns of stable carbon isotopic ratios recorded in terrestrial organic matter from Cenomanian–Maastrichtian successions for the Russian Far East can be correlated to those of carbonate carbon from ...
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(2004)The Baikal region is located in a single climate zone and includes the Baikal foredeep on the eastern margin of the Siberian craton and the Baikal rift evolving at the western boundary of the Baikal orogenic area. Late ...
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(1990)The following representative radiolarian assemblages are known in the Greater Caucasus: Callovian-Oxfordian, Tithonian, Albian-Cenomanian, Lower Turonian, Upper Turonian-Santonian, and Campanian-Masstrichtian. The discovery ...
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(1997)The effect of surface seismic disturbances induced by cosmic gravitational radiation is considered. A brief review of previous results is included. A spherically symmetric homogeneous isotropic Earth model with a four-component ...
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(2003)We present new results on the structure resulting from Palaeoproterozoic terrane accretion and later formation of one of the aulacogens in the East European Platform. Seismic data has been acquired along the 530-km-long, ...
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(2001)We introduce a method to infer upper mantle azimuthal anisotropy from the polarization, i.e., the direction of particle motion, of teleseismic long-period P onsets. The horizontal polarization of the initial P particle ...
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(2001)Although much progress has been made in determining the 3-D distribution of seismic wave velocities in the Earth, substantially less is known about the 3-D distribution of intrinsic attenuation. In this study variations ...
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UPPER MANTLE STRUCTURE BELOW THE DALDYN-ALAKITSK KIMBERLITE FIELD BY NUCLEAR EXPLOSION SEISMOGRAMS (2001)It was established on the basis of seismograms of nuclear explosions that the upper mantle up to the depth of 410 km is characterized by chemical differentiation, which occurs as alternating layers with low and high body ...
Now showing items 13631-13650 of 21934