Other
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..90..331o&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 90, no. 3, Nov. 18, 1988, p. 331-347. Research supported by the Royal
Other
60
Abundance, Earth Crust, Earth Mantle, Geochemistry, Helium Isotopes, Ocean Bottom, Basalt, Carbon, Carbon Dioxide, Geology, Methane, Natural Gas, Potassium Isotopes, Uranium Isotopes
Scientific paper
This paper is concerned with the distribution of mantle-derived He-3-rich primordial helium (as distinguished from radiogenic 'crustal' helium) in the continents, and with its relevance for the generation of continental crust. Using literature data on He-isotope distribution and the He-3/He-4 and C/He-3 ratios in methane-rich and CO2 continental gases, it is shown that the presence of mantle helium in the continental crust of West Europe and elsewhere, coincides closely with tectonically active areas, particularly, with those undergoing extension. It was possible to obtain estimates for the flux of mantle helium through the continental crust, and, by inference, the rates of addition of C, K, U, and Th and other elements to the crust, in areas of active extension. The results indicated that a significant portion of the continents' inventories of C, K, U, and Th might have been added along with basaltic melts at the sites of regional extension.
Keith O'Nions R.
Oxburgh Ronald E.
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