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Browsing ELibrary by Title
Now showing items 4717-4736 of 21821
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(1988)Finds of garnet peridotite xenoliths in Cenozoic volcanics are fairly rare. Until recently, only three such finds were known on the Vitim plateau, in Pliocene rocks of the Kandiduskha and the Yasha paleo-volcanoes. We give ...
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(1993)A suite of large and fresh peridotite xenoliths from a picrite tuff deposit in the Cenozoic Vitim volcanic field, {small tilde}200 km east of Lake Baikal, shows a continuous gradation from protogranular spinel through ...
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(2003)Detailed 3-D analysis of inclusion trails in garnet porphyroblasts and matrix foliations preserved around a hand-sample scale, tight, upright fold has revealed a complex deformation history. The fold, dominated by interlayered ...
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(2004)Some new data concerning the chemical composition of postmagmatic garnets and associating minerals from various alteration zones of potassic rhyolites and granites in the central part of the Au-Ag Dukat ore field are ...
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(2002)Clinozoisite gneisses were studied from the Barchi-Kol area, located 17 km to the west of the Kumdy-Kol microdiamond deposit at Kokchetav massif (Northern Kazakhstan). As distinct from the deposit, the studied rocks are ...
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(1986)New experimental data on compositions of garnets in two-pyroxene — garnet assemblages in the system CaO −MgO −Al2O3 −SiO2 (CMAS) are presented for conditions between 1,100 and 1,570° C and 30 to 50 kb. Garnets in these ...
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(1999)Experiments in the FMASCr system at pressures of 30-50 kbar and temperatures of 1200-1500°C model mineral equilibria in depleted mantle harzburgite. Special emphasis was on the partitioning of chromium between garnet, ...
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(1999)Experimental results for the four-phase assemblage in the MASCr (Doroshev et al., 1997) and FMASCr (Brey et al., 1999) systems are evaluated with respect to exchange (Fe-Mg and Cr-Al) and displaced equilibrium reactions ...
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(1988)Outcrops on the left bank of the Yenisey River expose banded gabbro, gabbro-norite and norite in the western part of this pluton near its floor. In isolated places these rocks were converted by high-pressure metamorphism ...
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(1996)Syn-eclogite facies pseudotachylytes of the Bergen Arcs, western Norway, were formed during co-seismic faulting at a depth of 60 km during Caledonian continent collision, concurrent with fluid-induced partial eclogitization ...
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(2002)A new GC-Pyrolysis-IRMS method was developed for the δ13C determination of carboxyl carbon in low-molecular weight organic acids. By utilizing a palladium-wire reactor at 600<space>°C with a helium/hydrogen reactant gas, ...
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(1991)In silicic volcanoes, eruptions commonly begin with violent explosive phases and evolve towards a regime of dome formation. This transition is characterized by a decrease of gas volume fraction, which has usually been ...
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(1988)The occurrence of gas bubbles at depths of 10 to 15 km or more has been demonstrated by analysis of inclusions. The ascent of gas bubbles in a closed isochoric magma system generates in them an excess (greater than in the ...
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(1989)Between 1982 and 1984, teams from the Institute (of volcanology) investigated a hydroacoustic anomaly in the Sea of Okhotsk off Paramushir Island that appeared on sonar traces as a dark water plume. Later a combination of ...
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(1999)Most silicic and some mafic magmas expand via second boiling if they crystallize at depths of about 10 km or less. The buildup of gas pressure due to second boiling can be relieved by expulsion of melt out of the region ...
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(1988)The finding of gas-hydrates in breccia from a submarine mud volcano in the South Caspian deep-sea basin served as the basis for predicting the presence here of gas-hydrate accumulations of a special submarine mud-volcano ...
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(1988)This paper gives the results of gas-logging surveys run on the 35th cruise of the R/V Dmitriy Mendeleyev in July 1985 in the Sea of Japan. During geologic investigations on the northwest slope of the North Yamato Ridge, ...
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(1997)Data from published oxygen isotope exchange experiments involving H2O and CO2 have been used to determine the reduced partition function ratios of liquid and supercritical fluid H2O and CO2. These data are compared with a ...
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(2003)Fluid substitution is an important part of seismic attribute work, because it provides the interpreter with a tool for modeling and quantifying the various fluid scenarios which might give rise to an observed amplitude ...
Now showing items 4717-4736 of 21821