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Olivine mineral chemistry for each pipe sample illustrated in binary plots of (A) Ni vs. Fo, (B) Mn vs. Fo, (C) Co vs. Fo, (D) Ti vs. Ca. For the Valmaggia pipe, ‘center’ and ‘rim’ refer to samples collected from the inner and outer portions of the pipe. (E) Primitive mantle normalized trace element spidergram showing the compositional averages for each pipe sample. Primitive mantle values are from McDonough and Sun (1995).
