Re–Os isotope evidence for the composition, formation and age of the lower continental crust

@article{Saal1998ReOsIE,
  title={Re–Os isotope evidence for the composition, formation and age of the lower continental crust},
  author={Alberto E Saal and Roberta L. Rudnick and Gregory E. Ravizza and Stanley R. Hart},
  journal={Nature},
  year={1998},
  volume={393},
  pages={58-61}
}
Knowledge of the composition of the lower continental crust is important for understanding the formation and evolution of the crust as a whole, and the petrogenesis of continental basalts. Here we present rhenium–osmium isotope data for two well characterized suites of lower-crustal xenoliths from North Queensland, Australia, which have average major- and trace-element compositions similar to estimates of the bulk lower continental crust,. Our data indicate that the lower crust has 1 to 2 times… 

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References

SHOWING 1-10 OF 28 REFERENCES

The osmium isotopic composition of the Earth's primitive upper mantle

THE elevated abundances of highly siderophile elements in the Earth's mantle, relative to what would be predicted from metal–silicate equilibrium, have often been cited as evidence for the accretion

Nature and composition of the continental crust: A lower crustal perspective

Geophysical, petrological, and geochemical data provide important clues about the composition of the deep continental crust. On the basis of seismic refraction data, we divide the crust into type

Dating crust-mantle separation: Re-Os isotopic study of mafic xenoliths from central Arizona

Mafic deep crustal and shallow upper mantle xenoliths hosted in the Chino Valley and Camp Creek latites of central Arizona have 187Os/188Os (0.216 to 1.51) ratios dramatically higher than values

The composition and petrogenesis of the lower crust: A xenolith study

Granulite facies lower crustal xenoliths from a single basaltic vent (Hill 32) in the McBride volcanic province, north Queensland, Australia, illustrate the extreme lithologic diversity of the deep