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Now showing items 9989-10008 of 39377
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(PANGAEA, 2000-11-02)
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(2003)Five sodium aluminosilicate glasses in the series Na 2O: xAl 2O 3:(3-x) SiO 2 and Na 2O:Al 2O 3:ySiO 2 were prepared and subjected to leaching at pH 2 under ambient conditions for up to 1000 h. Solid-state nuclear magnetic ...
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(2004)I/S clays (<1 μm size fraction) were analyzed by27Al NMR and infrared spectroscopy to investigate the double step dehydroxylation behavior which can be observed in many 2∶1 dioctahedral clays. The intensity changes of27Al ...
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(2000)Nuclear magnetic resonance (NMR) spectroscopy has been used extensively since the 1960’s to study phase transformations. When Lippmaa et al. (1980) presented the first significant high-resolution solid-state NMR spectroscopic ...
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(Федеральное государственное бюджетное учреждение науки Институт земной коры Сибирского отделения Российской академии наук, 2017)
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(1997)Liquidus phase relationships in the system MgSiO3-SiO2 at 5.0 GPa have been determined using a multianvil apparatus. Compared to phase relationships at 1 atm, the MgSiO3-SiO2 phase diagram at 5.0 GPa is significantly ...
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(2002)Mushy zones, assemblages of crystals and their pore-space liquids, have been invoked for both the upper and lower boundaries of the liquid outer core. The timescale of very slow accumulation compared with solidification ...
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(2000)We compare the rare gas elemental ratios measured in glass samples of mid-oceanic ridges (MORs) and oceanic island basalts to current estimates of the same ratios for upper and lower mantle reservoirs. We selected only ...
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(1998)We present a model on the evolution of atmosphere-mantle system assuming a significant degassing from the less depleted mantle, based on the recent results of the He-Ar systematics proposed by Matsuda and Marty (1995). The ...
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(2002)The study of noble gases in oceanic basalts is central to understanding chemical heterogeneity of the Earth’s mantle and origin of the atmosphere. In the terrestrial environment the abundances of noble gases are quite low ...
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(1998)In order to conjecture the degassing state of the Earth's interior, many kinds of noble gas systematics are used to characterize the source materials in the Earth's interior. Although some systematics show clear trends, ...
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(2004)Calcium-aluminum-rich inclusions (CAIs) were among the first solids in the solar system and were, similar to chondrules, created at very high temperatures. While in chondrules, trapped noble gases have recently been detected, ...
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(1995)We synthesized diamonds by shock transformation from natural graphite using a single-stage propellant gun and examined the noble gas concentrations in them. The diamond yields correlated with the shock pressure and with ...
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(1991)We synthesized vapor-growth diamonds by two kinds of Chemical Vapor Deposition (CVD) using microwave (MWCVD) and hot filament (HFCVD) ionization of gases, and examined elemental abundances and isotopic compositions of the ...
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(2003)We measured the concentrations of the cosmogenic radionuclides 10Be, 26Al, 36Cl, and 41Ca in the stone and metal fractions of 15 fragments of the Gold Basin L4 chondrite shower, as well as noble gases in 18 Gold Basin ...
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(2002)Volatiles are lost from the Earth’s mantle to the atmosphere, hydrosphere and crust through a combination of subaerial and submarine volcanic and magmatic activity. These volatiles can be primordial in origin, trapped in ...
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(1994)The abundance and isotopic composition of the trace amounts of noble gases found in magmas provide insights into the large-scale differentiation of the Earth, the origin of the atmosphere, and potentially into the degassing ...
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(2002)In contrast to most other fields of noble gas geochemistry that mostly regard atmospheric noble gases as 'contamination,' air-derived noble gases make up the far largest and hence most important contribution to the noble ...
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(2002)Fundamental insights in the field of cosmochemistry have come from the study of the abundances and isotopic compositions of trapped noble gases. A case in point is the discovery of presolar grains in primitive meteorites: ...
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(2004)Among numerous new meteorites found during 2001-2002 in the desert regions of the Sultanate of Oman, the achondrites Dhofar 303, Dhofar 305, Dhofar 307, Dhofar 280, Dhofar 733, and Dhofar 731 were identified as fragments ...
Now showing items 9989-10008 of 39377