Evolution of seafloor spreading rate based on Ar-40 degassing history

Details Evolution of seafloor spreading rate based on Ar-40 degassing history Evolution of seafloor spreading rate based on Ar-40 degassing history

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..851t&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 9, p. 851-854.

Physics

8

Argon Isotopes, Degassing, Ocean Bottom, Sea Floor Spreading, Earth Mantle, Geochemistry, Mathematical Models, Temporal Distribution

Scientific paper

A new degassing model of Ar-40 coupled with thermal evolution of the mantle is constructed to constrain the temporal variation of seafloor spreading rate. In this model, we take into account the effects of elemental partition and solubility during melt generation and bubble formation, and changes in both seafloor spreading rate and melt generation depth in the mantle. It is suggested that the seafloor spreading rate would have been almost the same as that of today over the history of the earth in order to explain the present amount of Ar-40 in the atmosphere. This result may also imply the mild degassing history of volatiles from the mantle.

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