Table S2.
Magnesium isotopic compositions of arc lavas from Martinique Island, Lesser Antilles arc
| Sample | Age, ka | MgO, wt% | LOI | 87Sr/86Sr | 143Nd/144Nd | 206Pb/204Pb | δ26Mg | 2 SD | δ25Mg | 2 SD |
| Recent arc | ||||||||||
| 06MT50* | −0.21 | 0.09 | −0.12 | 0.06 | ||||||
| Duplicate | −0.22 | 0.08 | −0.12 | 0.05 | ||||||
| Duplicate | −0.23 | 0.07 | −0.12 | 0.03 | ||||||
| Average | 1.929 | 2.27 | 0.23 | 0.704269 | 0.512744 | 19.4160 | −0.22 | 0.04 | −0.12 | 0.03 |
| 06MT51* | −0.19 | 0.09 | −0.10 | 0.06 | ||||||
| Duplicate* | −0.19 | 0.10 | −0.09 | 0.07 | ||||||
| Duplicate | −0.21 | 0.09 | −0.13 | 0.06 | ||||||
| Duplicate | −0.25 | 0.06 | −0.13 | 0.04 | ||||||
| Duplicate | −0.21 | 0.06 | −0.10 | 0.04 | ||||||
| Average | 1.929 | 2.09 | −0 | 0.704261 | 0.512766 | 19.4235 | −0.22 | 0.03 | −0.11 | 0.02 |
| 06MT40* | 189 | 2.49 | 0.82 | 0.704014 | 0.512832 | 19.3014 | −0.23 | 0.07 | −0.10 | 0.07 |
| 06MT37 | −0.19 | 0.09 | −0.09 | 0.06 | ||||||
| Duplicate | −0.19 | 0.06 | −0.10 | 0.04 | ||||||
| Average | 322 | 4.36 | 1.12 | 0.704986 | 0.512426 | 19.4802 | −0.19 | 0.05 | −0.10 | 0.03 |
| 04MT07* | 341 | −0.15 | 0.07 | −0.06 | 0.06 | |||||
| 06MT18* | 346 | 2.78 | 1.03 | 0.703931 | 0.512853 | 19.2506 | −0.19 | 0.07 | −0.12 | 0.06 |
| 06MT28* | 543 | 2.58 | 1.2 | 0.703901 | 0.512882 | 19.2263 | −0.20 | 0.07 | −0.07 | 0.06 |
| IAR* | 640 | 12.4 | −0 | 0.703821 | 0.512951 | 19.0545 | −0.19 | 0.07 | −0.09 | 0.06 |
| 06MT21* | −0.20 | 0.07 | −0.08 | 0.07 | ||||||
| Duplicate* | −0.22 | 0.07 | −0.11 | 0.05 | ||||||
| Average | 893 | 1.9 | 0.92 | 0.705718 | 0.512410 | 19.6166 | −0.21 | 0.05 | −0.10 | 0.04 |
| 06MT36* | −0.13 | 0.07 | −0.07 | 0.07 | ||||||
| Duplicate | −0.13 | 0.07 | −0.08 | 0.05 | ||||||
| Duplicate | −0.13 | 0.09 | −0.06 | 0.06 | ||||||
| Duplicate | −0.12 | 0.08 | −0.04 | 0.05 | ||||||
| replicate | −0.16 | 0.07 | −0.08 | 0.05 | ||||||
| Duplicate | −0.15 | 0.06 | −0.07 | 0.04 | ||||||
| Duplicate | −0.13 | 0.08 | −0.06 | 0.05 | ||||||
| Average | 998 | 2.01 | 1.55 | 0.706307 | 0.512293 | 19.6448 | −0.14 | 0.03 | −0.07 | 0.02 |
| 06MT61* | 1,175 | 7.9 | 0.1 | 0.703716 | 0.512818 | 19.1318 | −0.20 | 0.07 | −0.12 | 0.06 |
| 06MT55* | 1,332 | 3.02 | 1.19 | 0.704157 | 0.512782 | 19.2893 | −0.18 | 0.07 | −0.07 | 0.06 |
| 06MT14* | 1,530 | 3.69 | 0.99 | 0.705131 | 0.512616 | 19.5857 | −0.17 | 0.07 | −0.10 | 0.06 |
| 06MT19* | −0.24 | 0.07 | −0.10 | 0.07 | ||||||
| Duplicate* | −0.21 | 0.07 | −0.09 | 0.05 | ||||||
| Average | 1,750 | 2.84 | 1.4 | 0.705120 | 0.512612 | 19.5904 | −0.22 | 0.05 | −0.10 | 0.04 |
| 06MT04* | −0.13 | 0.07 | −0.07 | 0.06 | ||||||
| Duplicate | −0.13 | 0.09 | −0.06 | 0.06 | ||||||
| Average | 1,870 | 2.02 | 1.33 | 0.704972 | 0.512629 | 19.5847 | −0.13 | 0.06 | −0.07 | 0.04 |
| 06MT10* | −0.13 | 0.07 | −0.04 | 0.06 | ||||||
| Duplicate | −0.16 | 0.09 | −0.08 | 0.06 | ||||||
| Average | 2,111 | 2.94 | 1.85 | 0.705098 | 0.512558 | 19.5970 | −0.14 | 0.05 | −0.05 | 0.04 |
| 06MT13* | 2,550 | 3.08 | 1.17 | 0.704960 | 0.512650 | 19.6018 | −0.10 | 0.07 | −0.06 | 0.06 |
| 06MT30* | 3,010 | 3.66 | 3.1 | 0.704836 | 0.512627 | 19.5997 | −0.24 | 0.07 | −0.13 | 0.06 |
| 06MT34* | −0.15 | 0.07 | −0.06 | 0.06 | ||||||
| Duplicate | −0.15 | 0.09 | −0.08 | 0.06 | ||||||
| Average | 4,100 | 2.33 | 0.64 | 0.703920 | 0.512910 | 19.2247 | −0.15 | 0.06 | −0.07 | 0.04 |
| 06MT23* | −0.20 | 0.07 | −0.11 | 0.05 | ||||||
| Duplicate | −0.19 | 0.08 | −0.10 | 0.05 | ||||||
| Replicate* | −0.19 | 0.11 | −0.12 | 0.10 | ||||||
| Average | 4,863 | 3.29 | 1.16 | 0.703901 | 0.512921 | 19.2318 | −0.20 | 0.05 | −0.11 | 0.03 |
| 06MT32 | −0.20 | 0.07 | −0.09 | 0.05 | ||||||
| Duplicate | −0.18 | 0.09 | −0.09 | 0.06 | ||||||
| Duplicate | −0.20 | 0.06 | −0.10 | 0.04 | ||||||
| Average | 5,130 | 3.3 | 0.7 | 0.703867 | 0.512941 | 19.1985 | −0.20 | 0.04 | −0.10 | 0.03 |
| Intermediate arc | ||||||||||
| 06MT60* | 8,760 | 2.75 | 1.29 | 0.706689 | 0.512318 | 19.8770 | −0.18 | 0.07 | −0.09 | 0.06 |
| 06MT71 | −0.16 | 0.07 | −0.06 | 0.05 | ||||||
| Duplicate | −0.17 | 0.09 | −0.09 | 0.06 | ||||||
| Duplicate | −0.12 | 0.06 | −0.06 | 0.04 | ||||||
| Duplicate | −0.12 | 0.08 | −0.04 | 0.05 | ||||||
| Replicate* | −0.14 | 0.11 | −0.08 | 0.10 | ||||||
| Duplicate | −0.13 | 0.06 | −0.06 | 0.04 | ||||||
| Average | 10,300 | 3.8 | 0.93 | 0.704936 | 0.512806 | 19.7037 | −0.14 | 0.03 | −0.06 | 0.02 |
| 06MT69* | 10,640 | 5.25 | 1.95 | 0.704831 | 0.512837 | 19.6896 | −0.14 | 0.07 | −0.06 | 0.06 |
| Old arc | ||||||||||
| 06MT54* | 20,800 | 4.76 | 1.23 | 0.704092 | 0.512973 | 19.1876 | −0.15 | 0.07 | −0.11 | 0.06 |
| 06MT53* | −0.13 | 0.07 | −0.05 | 0.06 | ||||||
| Duplicate | −0.13 | 0.06 | −0.06 | 0.04 | ||||||
| Average | 23,400 | 2.85 | 1.36 | 0.704014 | 0.512967 | 19.1900 | −0.13 | 0.05 | −0.06 | 0.03 |
| 06MT68* | −0.21 | 0.07 | −0.10 | 0.07 | ||||||
| Duplicate* | −0.17 | 0.07 | −0.07 | 0.06 | ||||||
| Average | 24,800 | 6.47 | 1.47 | 0.703701 | 0.513030 | 18.9866 | −0.19 | 0.05 | −0.08 | 0.04 |
The age, MgO, LOI, and Sr, Nd, Pb isotopic data are from Labanieh et al. (4, 5); 2 SD is 2 times the SD of the population of n (n > 20) repeated measurements of the standards during an analytical session. Duplicate refers to repeated measurement of Mg isotopic ratios on the same purified Mg cuts at different days. Replicate refers to repeated column chemistry and measurement of different aliquots of a stock solution. The average value and associated 2 SD are error-weighted values calculated by Isoplot.
*
Data that were measured on a Nu Plasma HR-MC-ICP-MS; all other data were measured on a Nu Plasma II MC-ICP-MS.