Table 3

LA-ICPMS Results for Quality Controls and Minimum Detection Limits

Madagascar apatite
NIST glass 611
LA-ICPMS
NIST glass 613
LA-ICPMS
NIST glass 615
LA-ICPMS
LA-ICPMSSolution ICPMS
Analyte2Mean2RSD %Mean2RSD %Mean2RSD %Mean2RSD %Sample-1Sample-2Sample-3
Mg43265442<235355983751
V45054123<1.62638323232
Mn44153640<3.42517245241243
Cu435103652<3.9<0.35
Zn45573833<2.7<1.811119
As32393548<2.31386828284
Rb42753424<1.0<0.6
Sr5175733740472,00161,9421,9802,001
Y46353711<0.7427613282278279
Zr448538100.6951630191919
Nb4654399<0.89<0.12
Mo41553828<0.95<0.81
Ba45354010<2.8<0.320.60.1
La44053510<0.632,05892,1062,1272,098
Ce45343550<0.654,309144,2714,3154,239
Pr44953870.6894356511520482
Sm45353712<0.4718614205201203
Eu44853580.7572716302930
Gd44863713<0.7811813115122125
Dy43653512<0.405615
Yb448637130.51201528171617
W440739250.6130<0.0480.1360.0530.059
Pb422740322.86902619272626
Th45453780.65359917709654658
U459539210.8562322272626
Durango apatite
LA-ICPMS
Solution ICPMSReference apatite CTA-AC-1 Solution ICPMSCertifiedMDL1
Analyte2Mean2RSD %Sample-1Sample-2Sample-3Sample-1Sample-2Sample-3Mean± ppm
Mg124241071131304304704124356.9
V43365450499710299104101.6
Mn978959394300302289317503.4
Cu<3.44860465450.35
Zn<2.75.912.210.23833263881.8
As1242221354121712577272752.3
Rb<1.00.6
Sr513652047751023,00621,56322,58820,0000.3
Y67015640631658298297294272530.2
Zr<0.530.90.90.9434236510.05
Nb<0.120.12
Mo<0.810.81
Ba<1.42.41.84.0852849834767790.32
La3,87984,0593,7743,9012,2142,1802,2252,176940.17
Ce4,77384,8104,4814,6593,4533,3843,4743,3261750.06
Pr36874283934043553493510.03
Sm16214167168169165165164162240.13
Eu161116171745.646.145.046.71.30.01
Gd14914154151155131130128124230.1
Dy107150.02
Yb39154040411111101120.01
W<0.0170.0650.0470.0740.10.10.10.01
Pb<0.90.80.70.73.32.53.20.07
Th2221928126925022.021.921.621.82.10.01
U10191211114.03.93.94.40.90.01
  • Notes: Iron concentrations, which were analyzed by both LA-ICPMS and EMPA, are not listed due to poor detection limits (from ~150 to 2,200 ppm and ~0.14 wt %, respectively); consequently, only 44 analyses returned Fe concentrations above the detection limits; these data are not discussed here but are given in the Appendix Table 4

  • 1 Minimum detection limit

  • 2 All units are parts per million (ppm)