Atmospheric contamination: A possible source for heavy noble gases in basalts from Loihi Seamount, Hawaii
- Australian National Univ., Canberra (Australia)
Re-evaluation of available noble gas data obtained from the glassy rims of basalts from Loihi Seamount, Hawaii, shows that contamination of magmas prior to eruption, by addition of a significant component of atmosphere-derived heavy noble gases, is a plausible explanation for the observed atmosphere-like isotopic compositions of Ne, Ar, Kr, and Xe. The most likely source for the atmospheric component is interaction of the magma with seawater carrying dissolved atmosphere-derived noble gases. The possibility of a significant atmospheric component in Loihi samples suggests that the observed heavy noble gas compositions may not be representative of the mantle source of Loihi magmas. While leaving open the question of the noble gas composition in the source region, atmospheric contamination provides a valid alternative to the interpretation that the mantle source region of Loihi magmas has an atmosphere-like noble gas composition.
- OSTI ID:
- 5980475
- Journal Information:
- Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 17:6; ISSN 0094-8276; ISSN GPRLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540110
58 GEOSCIENCES
580000* -- Geosciences
ABUNDANCE
ALKALI METAL ISOTOPES
ARGON
ARGON 36
ARGON 40
ARGON ISOTOPES
BASALT
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHEMISTRY
CONTAMINATION
EARTH MANTLE
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EVEN-EVEN NUCLEI
FEDERAL REGION IX
FLUIDS
GASES
GEOCHEMISTRY
GEOLOGIC HISTORY
HAWAII
HELIUM
HYDROGEN COMPOUNDS
IGNEOUS ROCKS
ISOMERIC TRANSITION ISOTOPES
ISOTOPE RATIO
ISOTOPES
KRYPTON
LIGHT NUCLEI
MAGMA
MIXING
NEON
NONMETALS
NORTH AMERICA
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
POTASSIUM 40
POTASSIUM ISOTOPES
RADIOISOTOPES
RARE GASES
ROCKS
SEAWATER
SOURCE ROCKS
STABLE ISOTOPES
USA
VOLCANIC ROCKS
VOLCANOES
WATER
XENON
YEARS LIVIN