Table 3.

Average trace element composition of melt inclusions for the analysed eruptive units.

Li (ppm)B (ppm)Rb (ppm)Sr (ppm)Y (ppm)Cs (ppm)Ba (ppm)La (ppm)Ce (ppm)Pr (ppm)Nd (ppm)Sm (ppm)Th (ppm)U (ppm)
Kaharoa (n=12)
 avg.7625113361956941734412391
 1σ4251111454712010
Taupo (n=8)
 avg. (n=1)4124nananananananananananana
 avg.* (n=7)4821901172834562144019486
 1σ1252040393603022
Oruanui (n=9)
 avg.7228102601634941632011293
 1σ21312811441202013
Rotoiti (n=9)
 avg.602274541326591429139253
 1σ13281520433432012
Mamaku (n=28)
 Type 1 – avg.75161232430562824496205111
 1σ926611231201010
 Type 2 – avg.7216112282855652145518490
 1 σ4113821342301010
Ohakuri (n=51)
 Airfall – avg.63181232430661923485194112
 1σ91431191201111
 Type – avg.53171242630461524495194113
 1σ3111511291201110
 Type 2 – avg.40161063128457622455184102
 1σ718420242302111
 Type 3 – avg.41171322430461623495194103
 1σ4110311291211010
Kaingaroa (n=6)*
 avg.2723119521944741937014393
 1σ831712211062402011
Matahina (n=9)
 avg.69271084817365417341711292
 1σ1012611411634843121
  • Some trace elements for the Mamaku and Ohakuri eruptive deposits are after Bégué et al. (2014). SIMS analyses with a IMS Cameca 6f (Arizona State University); 10 nA beam intensity, 10–20 µm spot size. Analytical error: <3% for all elements; c. 10% for Th and U.

  • *Plagioclase-hosted melt inclusions.