Growth of early continental crust controlled by melting of amphibolite in subduction zones

  title={Growth of early continental crust controlled by melting of amphibolite in subduction zones},
  author={Stephen F. Foley and Massimo Tiepolo and Riccardo Vannucci},
It is thought that the first continental crust formed by melting of either eclogite or amphibolite, either at subduction zones or on the underside of thick oceanic crust. However, the observed compositions of early crustal rocks and experimental studies have been unable to distinguish between these possibilities. Here we show a clear contrast in trace-element ratios of melts derived from amphibolites and those from eclogites. Partial melting of low-magnesium amphibolite can explain the low… CONTINUE READING

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