Other
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..87..273h&link_type=abstract
Earth and Planetary Science Letters, Volume 87, Issue 3, p. 273-285.
Other
34
Scientific paper
We present new Sr, Th, and O isotopic results on recent olivine tholeiites and quartz tholeiites from the active rift zones in Iceland. Our data show a negative correlation between 87Sr/86Sr ratios and δ18O values, and a positive correlation between (230Th/232Th) ratios and δ18O. These covariations of isotopic ratios strongly support the model proposed by Oskarsson et al. (1982) [1]; which involves a mixing of mantle-derived magmas with crustal silicic magmas produced by melting of old hydrothermally altered rocks under central volcanoes. The hybrid magmas have quartz tholeiite compositions. Thus a large part of the Iceland geochemical anomaly is probably inherited from interaction of the primitive magmas (P-type tholeiites) with the Icelandic crust, and the mantle isotopic heterogeneities in the Icelandic ``mantle plume'' seem to be rather small.
Allègre Claude J.
Condomines Michel
Fourcade Serge
Hémond Ch.
Javoy Marc
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