Studies of noble gases in meteorites and in the earth
Thesis/Dissertation
·
OSTI ID:5374781
The isotopic and elemental abundances of noble gases in the solar system are investigated, using simple mixing models and mass-spectrometric measurements of the noble gases in meteorites and terrestrial rocks and minerals. Primordial neon is modeled by two isotopically distinct components from the interstellar gas and dust. Neon from the gas dominates solar neon, which contains about ten times more /sup 20/Ne than /sup 22/Ne. Neon in meteorites consists of galactic cosmic ray spallation neon and at least two primordial components, neon-E and neon-S. Neon was measured in several meteorites to investigate these end-members. Ca,Al-rich inclusions from the Allende meteorite were examined for correlation between neon-E and oxygen or magnesium isotopic anomalies. Measurements were made to determine the noble gas contents of various terrestrial rocks and minerals, and to investigate the cycling of noble gases between different terrestrial reservoirs. Juvenile and atmospheric gases have been measured in the glassy rims of mid-ocean ridge (MOR) pillow basalts. Evidence is presented that three samples contain excess radiogenic /sup 129/Xe and fission xenon, in addition to the excess radiogenic /sup 40/Ar found in all samples. The Skaergaard data demonstrate that atmospheric noble gases dissolved in ground water can be transferred into crustal rocks. Subduction of oceanic crust altered by seawater can transport atmospheric noble gases into the upper mantle.
- Research Organization:
- California Inst. of Tech., Pasadena (USA)
- OSTI ID:
- 5374781
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580400* -- Geochemistry-- (-1989)
ARGON
CHEMICAL ANALYSIS
DISSOLVED GASES
ELEMENTS
FLUIDS
GASES
GROUND WATER
HYDROGEN COMPOUNDS
INTERSTELLAR SPACE
ISOTOPE RATIO
MASS SPECTROSCOPY
METEORITES
NEON
NONMETALS
OXYGEN COMPOUNDS
RARE GASES
SOLAR ACTIVITY
SOLAR WIND
SOLUTES
SPACE
SPECTROSCOPY
WATER
XENON
580400* -- Geochemistry-- (-1989)
ARGON
CHEMICAL ANALYSIS
DISSOLVED GASES
ELEMENTS
FLUIDS
GASES
GROUND WATER
HYDROGEN COMPOUNDS
INTERSTELLAR SPACE
ISOTOPE RATIO
MASS SPECTROSCOPY
METEORITES
NEON
NONMETALS
OXYGEN COMPOUNDS
RARE GASES
SOLAR ACTIVITY
SOLAR WIND
SOLUTES
SPACE
SPECTROSCOPY
WATER
XENON