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Oxygen isotopes in deep-sea spherulesOxygen isotopic compositions have been measured on several size fractions of deep-sea spherules of extraterrestrial origin. The silicate spherules have an isotopic composition unlike that of any known macrometeorite. Their pre-terrestrial compositions may have been similar to those of C3 chondrites or the anhydrous component of C2 chondrites, the latter being preferred on chemical grounds. Metallic particles oxidize in the upper atmosphere, and sample a region for which no previous oxygen isotope data exist. This part of the atmosphere, above about 100 km, is apparently strongly enriched in the heavy isotopes of oxygen.
Document ID
19870033271
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Clayton, Robert N.
(Chicago Univ. Chicago, IL, United States)
Mayeda, Toshiko K.
(Chicago, University IL, United States)
Brownlee, Donald E.
(Washington, University Seattle, United States)
Date Acquired
August 13, 2013
Publication Date
September 1, 1986
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 79
Issue: 3-4
ISSN: 0012-821X
Subject Category
Lunar And Planetary Exploration
Accession Number
87A20545
Funding Number(s)
CONTRACT_GRANT: NSG-9052
CONTRACT_GRANT: NSF EAR-83-16812
Distribution Limits
Public
Copyright
Other

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