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Геология России: Recent submissions
Now showing items 261-280 of 41505
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MINERALOGICAL AND GEOCHEMICAL CHARACTERIZATION OF HYDROCARBON SEEP SEDIMENTS FROM THE GULF OF MEXICO (2006)A common characteristic of the Gulf of Mexico (GOM) seafloor, hydrocarbon seepage produces asphalt volcanism, brine pools, gas hydrates and authigenic carbonates. We studied authigenic carbonates from two areas: Green ...
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(2006)Melt fragments in melt breccias from the Gardnos impact crater, Norway, contain abundant carbon. A high proportion of the carbon present in the original melt was preserved. The stripping of hydrogen from carbon during ...
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(2006)Methane and hydrogen sulfide vent from a cold seep above a shallowly buried methane hydrate in a mud volcano located 24 km offshore southern California in· 800 m of water. Bivalves, authigenic calcite, and methane hydrate ...
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(2006)The Avila batholith of central Spain is composed, predominantly, of crustal-melt peraluminous granites cut by small-scale mafic alkaline bodies. Dating of the Gredos sector mafic camptonitic lamprophyre dykes was undertaken ...
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(2006)Absolute past geomagnetic field intensity determinations requiring laboratory heating are labourious and the success rate is rather low, mostly because of induced thermochemical magnetic mineral alterations. Archaeomagnetic ...
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(2006)Although the magmatic output of arc volcanoes defines clear chemical trends, the compositional sequence of eruption is often chaotic. At best, support for the concept of progressive evolution by fractionation/ assimilation ...
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(2006)Detailed melt and fluid inclusion studies in quartz hosts from the Variscan Ehrenfriedersdorf complex revealed that ongoing fractional crystallization of the highly evolved H2O-, B-, and F-rich granite magma produced a ...
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(2006)The topographic wetness index (TWI, ln(a/tanβ)), which combines local upslope contributing area and slope, is commonly used to quantify topographic control on hydrological processes. Methods of computing this index differ ...
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(2006)A well-justified stratigraphical correlation of continental successions and new palaeogeographic reconstruction of Pangaea reveal new insights into the northern Pangaean climate development influenced by palaeogeography, ...
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(2006)The Sino-Korean Craton (SKC) is an enigmatic block in the history of supercontinents older than Pangea. Its accretion to Eurasia and the effect of the broad region of Mesozoic-Cenozoic extension in northern Eurasia that ...
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(2006)Twenty-four refractory inclusions (40-230 μm, with average of 86 ± 40 μm) were found by X-ray mapping of 18 ordinary chondrites. All inclusions are heavily altered, consisting of fine-grained feldspathoids, spinel, and ...
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(2006)Inversions of an individual geophysical data set can be highly nonunique, and it is generally difficult to determine petrophysical parameters from geophysical data. We show that both issues can be addressed by adopting a ...
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(2006)Recent analyses of elemental concentrations and mineralogy of iron-bearing compounds of Martian soils and rocks by the Mars Exploration Rovers at Meridiani Planum and Gusev Crater demonstrate that phosphorus concentration ...
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(2006)Argentine Pampean sediments represent a nearly continuous record of deposition since the late Miocene (~ 10 Ma). Previous studies described five localized concentrations of vesicular impact glasses from the Holocene to ...
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(2006)Numerous dykes of ultramafic lamprophyre (aillikite, mela-aillikite, damtjernite) and subordinate dolomite-bearing carbonatite with U-Pb perovskite emplacement ages of ~590-555 Ma occur in the vicinity of Aillik Bay, coastal ...
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(2006)The spinel-garnet transition in Cr/Al-enriched peridotitic bulk compositions is known from experimental investigations to occur at 20-70 kbar, within the pressure range sampled by kimberlites. We show that the Cr2O3CaO ...
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(2006)Studies of mantle xenolith and xenocryst studies have indicated that the subcontinental lithospheric mantle (SCLM) at the Karelian Craton margin (Fennoscandian Shield) is stratified into at least three distinct layers cited ...
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(2006)A new occurrence of the rare corundum + quartz assemblage and magnesian staurolite has been found in a gedrite-garnet rock from the Central Zone of the Neoarchean Limpopo Belt in Zimbabwe. Poikiloblastic garnet in the ...
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(2006)Alkaline (sodic) volcanic rocks, i.e., ankaratrites-melanephelinites, basanites-tephrites, and phonolites, dated at 119 Ma and similar in composition to the 60-Ma plugs of the Asunción Province, occur in Eastern Paraguay ...
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(2006)Surface and subsurface geological features of the Himalayan - Tibetan orogenic system may be explained by three sets of processes: those related to plate convergence, those related to the gravitational spreading of a fluid ...
Now showing items 261-280 of 41505