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Now showing items 9925-9944 of 39069
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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 ...
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(1995)Meteorite ALH84001, a recently identified martian orthopyroxenite, has xenon with higher ratios of 129Xe/132Xe (up to 2.15) than any previously identified martian sample except the glass in EETA 79001, suggesting that it ...
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(1986)Primordial noble gases were measured in the unshocked ureilite ALHA #78019 (hereafter 78019) and in the moderately shocked ureilite Kenna. Much of the gas (> 25%) in 78019 is contained in fine-grained, amorphous carbon, ...
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(1998)Noble gas isotopic ratios in mantle-derived samples require variability in the time-integrated ratio of volatile to lithophile elements in the Earth. Documentation of mantle 3He/4He variability is becoming increasingly ...
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(2004)Presolar diamond recovered from the Boriskino CM2 meteorite was separated into size fractions by sedimentation in an ultracentrifuge. The average grain sizes of the fractions ranged from ~1.4 to ~5.3 nm. Noble gases were ...
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(2002)One of the reasons noble gases make such good tracers of processes occurring in rocks is their scarcity. Thus, a process that converts a small fraction of a relatively rare element into a noble gas can have a large effect ...
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(2003)Noble gases in two ureilites, Kenna and Allan Hills (ALH) 78019, were measured with two extraction methods: mechanical crushing in a vacuum and heating. Large amounts of noble gases were released by crushing, up to 26.5% ...
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(2003)Abundances and isotopic compositions of Ne (in bulk samples only), Ar, Kr, and Xe have been investigated in 6 monomict, 3 polymict, and the diamond-free ureilite ALH78019 and their acid-resistant, C-rich residues. Isotopic ...
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(1998)Noble gases including radioactive 81Kr (t1/2 = 2.1 × 105 yr) have been measured for the cumulate eucrite Binda and five noncumulate eucrites, Béréba, Camel Donga, Juvinas, Millbillillie, and Stannern, some of which have ...
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(2000)Oscillatory mineral zonation is usually associated with crystal growth in an open system, either a hydrothermal system or a melt after a period of magma mixing or degassing. Such systems may be driven sufficiently far from ...
Now showing items 9925-9944 of 39069