Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.114..149r&link_type=abstract
Earth and Planetary Science Letters, Volume 114, Issue 1, p. 149-157.
Other
8
Scientific paper
Although MORB are well known to exhibit a limited range in isotopic ratios such as 87Sr/86Sr, a compilation of existing (230Th/232Th) data, which reflect present Th/U in the source, shows a large dispersion. This is in contrast to the, admittedly limited, data available for oceanic islands, for which there is a broad correlation between 87Sr/86Sr and (230Th/232Th). The distribution of data for MORB is approximately bimodal, with relatively depleted samples plotting from within to well above the band defined by the oceanic island correlation (87Sr/86Sr = 0.70230-0.70270 and (230Th/232Th) = 1.1-2.3) and relatively enriched MORB plotting from within to below this band (87Sr/86Sr = 0.70270-70320 and (230Th/232Th) = 0.8-1.4). The data are consistent with the generally accepted idea that E-MORB are generated by the interaction of depleted mantle with more enriched material having higher Th/U and 87Sr/86Sr. However, the large range in source Th/U implied by the thorium isotopic compositions of both enriched and depleted MORB requires complex melting and/or other recent source modification processes. Much of this variability may be caused by multiple, small-degree melt extraction at the spreading ridge, a process which would affect all incompatible trace element concentrations and ratios.
Macdougall Douglas J.
Rubin Ken H.
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