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Now showing items 10528-10547 of 39068
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(2002)Identifying the mechanisms that drove the evolution of planetary volatiles from primordial to present-day compositions is one of the classic challenges in the planetary sciences. The field bristles with models of one type ...
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(1996)Describes the factors that control the amplitude and frequency of sea-floor seismic noise in the frequency band f=3...20 Hz and discusses some sources of the most significant disturbances. The low frequency disturbances ...
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(1998)I have oversaturated the immiscible system SiO2Al2O3FeOK2O with FeCr2O4 to study the fractionation of chromite between conjugate siliceous and fayalitic melts. Although both melts are oversaturated with chromite, chromite ...
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(2001)The principal isoprenoid hydrocarbons in flash pyrolysates from immature kerogens are prist-1-ene and, to a lesser extent, prist-2-ene. The precise origin of these compounds is still a matter of debate. Chemical degradation ...
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(рукопись, 1994)Lava flows from sixteen sites at Gorely Volcano, Kamchatka were sampled. Initial analysis showed high within-site scatter for NRM specimen directions. Alternating field and thermal demagnetization of specimens showed ...
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(2006)Silica-rich objects are common minor components in ordinary chondrites (OC), occurring as fragments and as chondrules. Their typical paragenesis is orthopyroxene + SiO2 (with bulk SiO2 >65 wt%) and occasionally with ...
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(1989)The foci of strong tremors are generally confined to long-lived active faults. However, some earthquakes occur at great distances from the boundaries of lithospheric plates, and the seismic events which occur in the stable ...
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(2004)Our investigations in Alaska and Russia show that the curved orogen of the Bering Strait region is a composite feature that formed as a result of multiple superimposed events and cannot be related to latest Cretaceous-early ...
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(1990)The origin of the Central Asiatic mountain belt is treated nowadays from two opposing points of view. Some researchers believe that it is a consequence of the collision of the Indo-Australian and Eurasian lithospheric ...
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(1990)Zone of oil and gas accumulation encompassing the Nadym-Pur, Pur-Tzov, Gydansk and Yamal oil and gas regions has been established in the northern part of West Siberia. A characteristic feature of this zone is the development ...
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(2004)An understanding of the tectonic stress field is geologically important because it is the agent that preserves in the crust a memory of dynamical processes. In an effort to elucidate the origin of the present state of ...
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(1992)Large deposits of magnesite (MgCO3) occur either as carbonated ultramafic rocks or as sedimentary beds. The origins of both sedimentary and ultramafic-hosted deposits remain controversial, as does the relationship between ...
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(2003)Detailed interpretation of upper-mantle scattered waves recorded in the 800-1400 km offset range of four reversed `peaceful nuclear explosion' seismic sections along the 3500 km long profile Kraton in Russia has revealed ...
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(2004)Secondary ion mass spectrometer (SIMS) oxygen isotope analyses were performed on 24 clasts, representing 9 clast types, in the Dar al Gani (DaG) 319 polymict ureilite with precisions better than 1‰. Olivine-rich clasts ...
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(1999)Isotopic analyses of fluids from the wells drilled in the Mutnovsky geothermal field revealed that the water of a melting glacier in the crater of Mutnovsky Volcano might be a source of water supply to the Dachnyi and ...
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(2001)Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was used to measure distributions of the siderophile elements P, V, Cr, Fe, Co, Ni, Mo, Ru, Rh, Pd, W, Re, Os, Ir, and Pt in metal grains in the ...
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(2001)We have determined slip rates on the most active reverse faults, reconstructed an extensive preorogenic erosion surface, constructed local and regional cross sections, and dated syntectonic Tertiary sedimentary rocks by ...
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(2001)Investigations of natural and synthetic quartz specimens by cathodoluminescence (CL) microscopy and spectroscopy, electron paramagnetic resonance (EPR) and trace-element analysis showed that various luminescence colours ...
Now showing items 10528-10547 of 39068