Rb-Sr mantle isochrons from oceanic regions

Details Rb-Sr mantle isochrons from oceanic regions Rb-Sr mantle isochrons from oceanic regions

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32...51b&link_type=abstract

Earth and Planetary Science Letters, Volume 32, Issue 1, p. 51-61.

Physics

30

Scientific paper

Existing data for 87Sr/86Sr and Rb/Sr ratios of basalts from oceanic islands and mid-ocean spreading ridges show significant positive correlations on a Rb-Sr isochron diagram (when data are averaged by island group). Furthermore, tholeiites and alkali basalts occupy distinct non-overlapping fields on this plot. The tholeiite correlation is interpreted as a mantle isochron, and the agreement of this age (1.6 +/- 0.2 b.y.) with that reported for Pb-Pb isochrons from oceanic basalts lends strong support to the use of such isochrons for tracing mantle evolution. Oceanic basalts are apparently sampling a mantle in which chemical heterogeneities have persisted for at least 1.5-2.0 b.y. The data support a kinematic model for the mantle in which a relatively uniform and non-radiogenic asthenosphere is penetrated by, and mixed with, blobs or plumes derived from an isolated (1.5-2 b.y.) and chemically heterogeneous mesosphere.

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