Unaltered cosmic spherules in a 1.4-Gyr-old sandstone from Finland
Article Abstract:
Micrometeorites have been used to detect past changes in the flux of incoming extraterrestrial matter, but this is hampered as objects with ages higher than 0.5 Myr show severed chemical alteration. Unaltered cosmic spherules in a 1.4-Gyr sandstone from Finland have been discovered. It is inferred that red beds could contain substantial unbiased populations of fossil micrometerorites, studies of which could provide information on variations in the micometeorite flux from the early Proterozoic era to recent times.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Rare-gas solids in the Earth's deep interior
Article Abstract:
Research shows that noble gases become decreasingly soluble under increasing pressure. Experiments using pressures or around 50 GPa illustrate that the gases argon, krypton and xenon become increasingly solid with temperatures measuring up to 3,000 degrees kelvin. Evidence suggests that rare-gas solids would have existed inside the planet when the Earth was forming.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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