Matrix Effects Effects from Water By Difference Effects

Matrix Effects? • Effects from Water By Difference • Effects from Na, Si, etc “migration”

John Donovan: Note: Si. O 2 and Al 2 O 3 values as a function of the corrections Matrix Effects Note: changes in 24 H-1 -1 matrix corrections and P/B (MAN) No Volatile Correction, No Water By Difference Results in Oxide Weight Percents ELEM: 58 59 60 61 62 Ca. O. 411. 437. 423. 435 K 2 O 4. 900 4. 624 4. 998 4. 853 4. 847 Fe. O. 537. 612. 526. 637. 677 Si. O 2 74. 603 75. 386 74. 715 75. 000 74. 613 Mg. O. 036. 033. 023. 047. 048 Na 2 O 2. 644 1. 841 2. 765 2. 137 2. 561 Al 2 O 3 11. 975 12. 024 12. 113 12. 089 Ti. O 2. 073. 113. 065. 055. 036 P 2 O 5. 000. 011 O. 000 H 2 O. 000 SUM 95. 180 95. 070 95. 628 95. 240 95. 317 AVER: SDEV: %RSD: . 426. 011 2. 5 4. 844. 137 2. 8 . 598. 065 10. 8 74. 863. 333. 4 . 037. 010 27. 9 2. 390. 387 16. 2 12. 058. 057. 5 . 068. 028 41. 5 . 002. 005 223. 6 . 000 418. 3 . 000. 0 95. 287 ZCOR: KRAW: PKBG: 1. 1202. 0161 4. 96 1. 1536. 3080 59. 36 1. 1987. 0057 4. 84 1. 2061 1. 0344 370. 59 1. 4303. 0003 1. 42 1. 8227. 1323 30. 93 1. 2568. 7242 77. 40 1. 1983. 0006 1. 4641 -. 0004. 87 . 0000. 00 Excel Spreadsheet Subtraction Gives ~ 4. 7% H 2 O

Volatile Correction Matrix Effects 24 H-1 -1 With Volatile Correction, No Water By Difference Results in Oxide Weight Percents ELEM: 58 59 60 61 62 Ca. O. 411. 437. 423. 435 K 2 O 4. 867 4. 740 4. 933 5. 220 4. 715 Fe. O. 537. 612. 526. 636. 677 Si. O 2 74. 378 75. 016 74. 057 74. 552 74. 794 Mg. O. 037. 034. 024. 048. 049 Na 2 O 3. 626 2. 426 3. 805 3. 025 3. 503 Al 2 O 3 12. 035 12. 063 12. 178 12. 147 12. 146 Ti. O 2. 030. 194. 076. 077. 048 P 2 O 5. 000. 011 O. 000 H 2 O. 000 SUM 95. 921 95. 521 96. 022 96. 128 96. 378 AVER: SDEV: %RSD: . 426. 011 2. 5 4. 895. 203 4. 1 . 598. 065 10. 8 74. 559. 370. 5 . 038. 010 27. 3 3. 277. 557 17. 0 12. 114. 062. 5 . 085. 064 75. 6 . 002. 005 223. 6 . 000. 0 95. 994 ZCOR: KRAW: PKBG: VOL%: DEV%: 1. 1198. 0161 4. 97. 000. 0 1. 1530. 3114 60. 00 1. 135. 2 1. 1983. 0057 4. 84. 000. 0 1. 2092 1. 0276 369. 28 -. 658. 0 1. 4391. 0003 1. 43. 000. 0 1. 8180. 1819 42. 09 36. 111. 4 1. 2625. 7242 77. 000. 0 1. 1979. 0008 1. 58 20. 283 20. 3 1. 4627 -. 0004. 87. 000. 0 . 0000. 00. 000. 0 Na, Si, K Intensity Over Time Iteration Gives ~ 4% H 2 O

Water By Difference Matrix Effects 24 H-1 -1 With Volatile Correction, Water By Difference Results in Oxide Weight Percents ELEM: 58 59 60 61 62 Ca. O. 414. 441. 426. 438 K 2 O 4. 885 4. 759 4. 951 5. 239 4. 730 Fe. O. 542. 618. 531. 641. 682 Si. O 2 74. 776 75. 464 74. 441 74. 934 75. 149 Mg. O. 039. 036. 026. 050. 051 Na 2 O 3. 668 2. 457 3. 848 3. 058 3. 539 Al 2 O 3 12. 139 12. 181 12. 249 12. 240 Ti. O 2. 030. 195. 076. 077. 048 P 2 O 5. 000. 011 O. 000 AVER: SDEV: %RSD: . 429. 011 2. 5 4. 913. 203 4. 1 . 603. 065 10. 8 74. 953. 385. 5 . 041. 010 25. 7 3. 314. 562 16. 9 12. 218. 057. 5 . 085. 065 75. 6 . 002. 005 223. 6 . 000 -104. 6 ZCOR: KRAW: PKBG: VOL%: DEV%: 1. 1241. 0161 5. 03. 000. 0 1. 1571. 3114 60. 00 1. 135. 2 1. 2053. 0057 4. 89. 000. 0 1. 2156 1. 0276 372. 20 -. 658. 0 1. 4515. 0004 1. 46. 000. 0 1. 8372. 1821 43. 35 36. 111. 4 1. 2731. 7244 78. 99. 000. 0 1. 2037. 0008 1. 58 20. 283 20. 3 1. 4591 -. 0004. 87. 000. 0 . 0000. 0 H 2 O 3. 506 3. 849 3. 420 3. 327 3. 112 SUM 100. 000 3. 443 100. 000. 270 7. 9. 0000. 0 Both Na, Si, K Change and Water By Difference Gives 3. 4% H 2 O

Water By Difference vs. FTIR Comparison of melt inclusion water contents measured by FTIR in sub-micron melt inclusion water contents estimated as the difference between 100% and microprobe analysis totals or “water by difference” (WBD). Solid diagonal line indicates 1: 1 correspondence, dashed line is a linear regression fixed at the origin. Gray symbols show WBD water content before matrix correction of the analysis and black symbols show matrix-corrected WBD estimates. From Roman, 2003