U-series isotope evidence for the origin of continental basalts

Details U-series isotope evidence for the origin of continental basalts U-series isotope evidence for the origin of continental basalts

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.134....1a&link_type=abstract

Earth and Planetary Science Letters, vol. 134, Issue 1-2, pp.1-7

Computer Science

13

Scientific paper

U-series isotopic data may uniquely constrain the depth of melting of basalts and present-day compositional variability of the mantle under continents, because the ( 230 Th/ 238 U) activity ratio of basalts depends strongly on the residual mineralogy. Rift basalts from the Pinacate Volcanic Field (PVF) in Mexico have ( 230 Th/ 238 U) of 1.22-1.35. In contrast, basalts from the San Francisco volcanic field (SFVF), Colorado Plateau, USA, part of a stable continental craton, have equilibrium ( 230 Th/ 238 U) values. The U-series isotopic data, consistent with recent mineral/melt partitioning results [1-5], require that some continental basalts from areas of thick crust be derived from the shallower lithospheric mantle source, and rift basalts from a deeper OIB-type asthenospheric source.

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