Terrestrial xenon isotope constraints on the early history of the earth

Details Terrestrial xenon isotope constraints on the early history of the earth Terrestrial xenon isotope constraints on the early history of the earth

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.315..471o&link_type=abstract

Nature (ISSN 0028-0836), vol. 315, June 6, 1985, p. 471-474.

Computer Science

15

Degassing, Earth Mantle, Granite, Planetary Composition, Primitive Earth Atmosphere, Xenon Isotopes, Carbon Dioxide, New Mexico

Scientific paper

Published data on Xe isotope composition in terrestrial samples are examined and their implications for the early history of the earth are discussed. Comparison between I-129-radiogenic Xe-129 and Pu-244-fissiogenic Xe-136 components in terrestrial xenon suggests that the earth's inner region accreted a few tens of millions of years earlier than the outer region from which the atmosphere evolved. The results also indicate that there has been no substantial mixing of the two regions since the earth's accretion. The terrestrial Xe isotope data need not lead to the conclusion that the excess Xe-129 requires very early mantle degassing, as is generally assumed.

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