Picritic glasses from Hawaii

  title={Picritic glasses from Hawaii},
  author={David A. Clague and William S. Weber and Jacqueline E. Dixon},
ESTIMATES of the MgO content of primary Hawaiian tholeiitic melts range from 8wt% to as high as 25wt% (refs 1, 2). In general, these estimates are derived from analysis of the whole-rock composition of lavas, coupled with the compositions of the most magnesian olivine phenocrysts observed. But the best estimate of magma composition comes from volcanic glass, as it represents the liquid composition at the time of quenching; minimal changes occur during the quenching process. Here we report the… CONTINUE READING
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