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The outgassing history of the Earth's atmosphere

G. Turner
The outgassing history of the Earth's atmosphere
Journal of the Geological Society of London (January 1989) 146 (1): 147-154


Helium provides the best indication of current noble-gas outgassing rates which are seen to be extremely low in comparison to the mean rates over geological time. Extremely high (super 40) Ar/ (super 36) Ar ratios in MORB indicate that the major release of primordial volatiles occurred before there had been significant growth of radiogenic (super 40) Ar in the mantle, i.e. within the first 500 m.y. or so of Earth history. High (super 129) Xe/ (super 130) Xe ratios in MORB combined with the argon data can be used to indicate that > or equal to 80% of the release occurred in the first 50 m.y. of Earth history, although there are possible alternative interpretations. The data can be used to constrain a narrow range of acceptable mathematical models but the major conclusion that outgassing occurred early in Earth history is inescapable and model independent.

ISSN: 0016-7649
EISSN: 2041-479X
Serial Title: Journal of the Geological Society of London
Serial Volume: 146
Serial Issue: 1
Title: The outgassing history of the Earth's atmosphere
Author(s): Turner, G.
Affiliation: Univ. Sheffield, Dep. Phys., Sheffield, United Kingdom
Pages: 147-154
Published: 198901
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 25
Accession Number: 1989-062431
Categories: Isotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Source Note: Biota and paleoatmospheres; thematic papers
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 1989
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