A Proterozoic lithospheric source for Karoo magmatism: evidence from the Nuanetsi picrites

@inproceedings{Ellam1989APL,
  title={A Proterozoic lithospheric source for Karoo magmatism: evidence from the Nuanetsi picrites},
  author={Robert M Ellam and Keith Gordon Cox},
  year={1989}
}
Highly magnesian Jurassic picrite basalts from the Nuanetsi area of southeastern Zimbabwe are close to primary mantle melts, not substantially modified by high level fractionation processes. The lavas display a wide variation in isotope ratios and incompatible trace element abundances, which may be attributed to a heterogeneous mantle source. SmNd isotope results, on samples carefully selected to be thoroughly representative of the chemical variation within the whole suite, reveal a late… CONTINUE READING

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