Sample Number Temperature (K) P_CO (Pa) Duration (h) No. of analyses f18O_mean 1 sigma standard error (f18O_mean) 1 sigma standard deviation (f18O_mean) Δf18O/f18Ogas_mean 1 sigma standard error (Δf18O/f18Ogas_mean) 1 sigma standard deviation (Δf18O/f18Ogas_mean) Starting material used to obtain the f18Oi value. Starting material_1 / / / 51 0.00202289 1.46131E-06 2.92263E-06 / / / / Starting material_2 / / / 53 0.002041226 2.419E-07 4.838E-07 / / / / Starting material_3 / / / 40 0.00205497 5.23038E-07 1.04608E-06 / / / / Starting material_4 / / / 50 0.002037802 8.80734E-07 1.76147E-06 / / / / Starting material_5 / / / 30 0.002043336 2.11433E-07 4.22865E-07 / / / / Starting material_6 / / / 20 0.00203786 2.77496E-07 5.54992E-07 / / / / Starting material_7 / / / 14 0.002038171 8.88406E-08 1.77681E-07 / / / / Starting material_8 / / / 40 0.002040948 2.68883E-07 5.37766E-07 / / / / Starting material_9 / / / 20 0.002053419 1.18637E-06 2.37274E-06 / / / / Starting material_10 / / / 20 0.002056881 5.56442E-07 1.11288E-06 / / / / Starting material_11 / / / 20 0.002042975 4.97303E-07 9.94605E-07 / / / / Amorphous forsterite-CO experiments CO47 883 1 19.66666667 50 0.057466675 0.002045776 0.004091552 0.056560074 0.002087527 0.014761046 Starting material_4 CO56 883 1 42 50 0.09167802 0.003493012 0.006986024 0.091469551 0.003564298 0.025203394 Starting material_6 CO46 883 1 65 50 0.163762364 0.004257509 0.008515018 0.165025063 0.004344397 0.030719528 Starting material_4 CO11 883 0.3 3 85 0.010378983 0.000197527 0.000395054 0.008526626 0.000201563 0.001858303 Starting material_1 CO1 883 0.3 4 90 0.011408516 0.000245417 0.000490833 0.009577169 0.000250429 0.002375764 Starting material_1 CO8 883 0.3 4 90 0.00974332 0.000209659 0.000419318 0.00787799 0.000213943 0.002029619 Starting material_1 CO9 883 0.3 7 90 0.014290544 0.000601843 0.001203686 0.012518014 0.000614127 0.005826115 Starting material_1 CO7 883 0.3 16 90 0.037236757 0.00126436 0.00252872 0.035932518 0.001290164 0.01223957 Starting material_1 CO10 883 0.3 20 90 0.044327089 0.001502417 0.003004835 0.04316755 0.00153308 0.014544068 Starting material_1 CO6 883 0.3 24 86 0.051345263 0.001605331 0.003210663 0.050328952 0.001638094 0.015191056 Starting material_1 CO22 883 0.3 48 80 0.09496239 0.003257495 0.006514989 0.09480349 0.003323974 0.029730529 Starting material_3 CO33 883 0.05 26 50 0.018159772 0.000802008 0.001604016 0.016445343 0.000818376 0.00578679 Starting material_5 CO39 883 0.05 48 50 0.042894685 0.001805461 0.003610922 0.041685051 0.001842307 0.013027077 Starting material_5 CO44 883 0.05 72 50 0.060004283 0.002146925 0.004293851 0.059149471 0.00219074 0.015490874 Starting material_4 CO52 853 1 65 50 0.10562965 0.003491239 0.006982478 0.105705908 0.003562489 0.025190598 Starting material_6 CO53 853 1 42 50 0.07373885 0.002848383 0.005696765 0.073164276 0.002906513 0.02055215 Starting material_6 CO54 853 1 69 50 0.11100472 0.002912502 0.005825005 0.111190673 0.002971941 0.021014798 Starting material_6 C055 853 1 120 50 0.197274336 0.003202879 0.006405758 0.199220894 0.003268244 0.023109973 Starting material_6 CO16 853 0.3 3 108 0.00821152 0.000171749 0.000343499 0.006296218 0.000175255 0.001821298 Starting material_2 CO17 853 0.3 16 51 0.034708242 0.001739041 0.003478082 0.03333369 0.001774531 0.012672689 Starting material_2 CO13 853 0.3 24 57 0.02697395 0.001765098 0.003530196 0.025441555 0.001801121 0.013598162 Starting material_2 CO12 853 0.3 48 63 0.077238146 0.003579253 0.007158506 0.076731551 0.003652299 0.028989226 Starting material_2 CO21 853 0.3 115 80 0.16847637 0.004432878 0.008865755 0.169817755 0.004523344 0.040458022 Starting material_3 CO23 853 0.05 90 160 0.05393604 0.001338755 0.00267751 0.052939867 0.001366076 0.017279651 Starting material_3 CO24 853 0.05 68 140 0.0436159 0.001598808 0.003197615 0.042409112 0.001631436 0.019303416 Starting material_3 CO35 853 0.05 66 50 0.04045777 0.001352015 0.00270403 0.039198402 0.001379607 0.009755296 Starting material_5 CO42 853 0.05 70 80 0.038310138 0.001408649 0.002817297 0.037012588 0.001437397 0.012856468 Starting material_4 CO41 853 0.05 47 50 0.023464575 0.000749234 0.001498468 0.021864054 0.000764525 0.005406009 Starting material_4 CO32 853 0.05 70 50 0.055640329 0.002109854 0.004219708 0.05469081 0.002152912 0.015223389 Starting material_5 C057 853 0.05 141 50 0.07610648 0.002511644 0.005023287 0.075580224 0.002562902 0.018122452 Starting material_6 CO58 803 1 41.08333333 50 0.053488792 0.001198439 0.002396878 0.052500951 0.001222897 0.008647186 Starting material_6 CO59 803 1 74 50 0.075234112 0.002349861 0.004699723 0.074690053 0.002397818 0.016955133 Starting material_6 CO60 803 1 20 50 0.032061867 0.000802442 0.001604884 0.030636742 0.000818818 0.005789919 Starting material_6 CO61 803 1 119 50 0.107418894 0.002047527 0.004095055 0.10753135 0.002089314 0.014773678 Starting material_7 CO19 803 0.3 3 50 0.008120423 0.000187881 0.000375762 0.006203262 0.000191715 0.001355631 Starting material_2 CO18 803 0.3 18 208 0.027317135 0.000450924 0.000901848 0.025791744 0.000460126 0.006636036 Starting material_2 CO14 803 0.3 27 55 0.034450695 0.001181831 0.002363661 0.033070887 0.00120595 0.008943562 Starting material_2 CO15 803 0.3 67 50 0.075415345 0.001949724 0.003899448 0.07487155 0.001989514 0.014067989 Starting material_2 CO20 803 0.3 177 159 0.14534675 0.001029778 0.002059555 0.146216102 0.001050794 0.013250001 Starting material_3 CO26 803 0.05 65 80 0.03474037 0.00132988 0.00265976 0.033352449 0.001357021 0.012137561 Starting material_3 CO25 803 0.05 90 80 0.04602143 0.001963508 0.003927015 0.044863735 0.002003579 0.017920556 Starting material_3 CO29 803 0.05 168 80 0.07562451 0.001227257 0.002454515 0.075070959 0.001252304 0.011200943 Starting material_3 CO30 803 0.05 312 80 0.11963629 0.002181028 0.004362056 0.119980939 0.002225539 0.019905824 Starting material_3 CO40 753 0.3 67 50 0.048893957 0.000650206 0.001300413 0.047812403 0.000663477 0.004691488 Starting material_4 CO45 753 0.3 160 50 0.101051153 0.000980877 0.001961754 0.101034032 0.001000895 0.007077398 Starting material_4 CO43 753 0.3 120 50 0.076368301 0.001275893 0.002551786 0.075847448 0.001301932 0.009206049 Starting material_4 CO36 703 0.3 144 50 0.045241958 0.000329214 0.000658428 0.044080227 0.000335933 0.002375402 Starting material_5 CO31 703 0.3 330 50 0.07157927 0.000757429 0.001514857 0.070955035 0.000772886 0.005465131 Starting material_5 CO37 703 0.3 72 50 0.032888337 0.000357639 0.000715279 0.031474491 0.000364938 0.002580502 Starting material_5 CO38 703 0.3 240 50 0.062404304 0.000836571 0.001673142 0.061592825 0.000853644 0.006036174 Starting material_5 CO48 673 0.3 208 50 0.04974208 0.000489589 0.000979179 0.048677776 0.000499581 0.003532572 Starting material_6 CO49 673 0.3 114 50 0.03604622 0.000312645 0.00062529 0.034702408 0.000319025 0.00225585 Starting material_6 CO50 673 0.3 65.75 50 0.02772616 0.000362558 0.000725116 0.026212551 0.000369957 0.002615991 Starting material_6 CO51 673 0.3 90 50 0.03006365 0.000384644 0.000769288 0.028597745 0.000392494 0.00277535 Starting material_6 CO74 643 0.3 140 99 0.035012018 0.000181569 0.000363139 0.033643949 0.000185275 0.001843463 Starting material_8 CO75 643 0.3 24 100 0.015303851 0.000112225 0.000224451 0.013533575 0.000114516 0.001145159 Starting material_8 CO77 643 0.3 91 100 0.025564984 0.000158125 0.000316249 0.024004119 0.000161352 0.001613516 Starting material_8 CO76 643 0.3 118 95 0.028921019 0.000170267 0.000340534 0.027428644 0.000173742 0.001693427 Starting material_8 Amorphous forsterite-H2O experiments W2 623 0.1 88 30 0.041831814 0.000734877 0.001469754 0.041008655 0.000757606 0.004149579 Starting material_9 W3 623 0.1 114 30 0.045328159 0.000554814 0.001109627 0.044613134 0.000571974 0.003132828 Starting material_9 W5 623 0.1 210 30 0.047176322 0.00055428 0.001108559 0.046514887 0.000571423 0.00312981 Starting material_10 W6 623 0.1 63 30 0.032372305 0.000401365 0.00080273 0.031253014 0.000413779 0.00226636 Starting material_10 W7 623 0.1 93 30 0.037175069 0.000565054 0.001130109 0.036204318 0.000582531 0.003190651 Starting material_10 W8 743 0.1 70 30 0.128980851 0.00140112 0.002802239 0.130849454 0.001444453 0.007911597 Starting material_10 W9 743 0.1 166 30 0.167248143 0.000929587 0.001859174 0.170300269 0.000958337 0.00524903 Starting material_10 W10 743 0.1 40 30 0.105889386 0.000943112 0.001886224 0.10704382 0.000972281 0.005325401 Starting material_10 W11 743 0.1 24 30 0.09645731 0.000981017 0.001962035 0.097320029 0.001011358 0.005539438 Starting material_10 W12 673 0.1 254 29 0.075271519 0.001091531 0.002183063 0.075479008 0.00112529 0.006059873 Starting material_10 W13 673 0.1 70 29 0.057244598 0.000467371 0.000934741 0.056894553 0.000481826 0.00259471 Starting material_10 W14 673 0.1 120 30 0.061645219 0.000658143 0.001316287 0.061431276 0.000678498 0.003716289 Starting material_10 W15 673 0.1 45 30 0.047532776 0.00041848 0.000836961 0.046882366 0.000431423 0.002363003 Starting material_10 W16 648 0.1 110 30 0.041586677 0.000326545 0.000653089 0.040766704 0.000336644 0.001843877 Starting material_11 W17 648 0.1 66.5 30 0.034966129 0.000351467 0.000702935 0.033941396 0.000362338 0.001984606 Starting material_11 W18 648 0.1 284 30 0.046478571 0.000625451 0.001250902 0.045809893 0.000644795 0.003531689 Starting material_11 W19 648 0.1 48 30 0.029316299 0.000370808 0.000741616 0.028116829 0.000382277 0.002093815 Starting material_11 Kinetic data obtained by fitting Temp. (K) Flow gas Flow gas pressure (Pa) Supply-controlled reaction Diffusion-controlled reaction Monodispersea Polydisperseb Monodisperse Polydisperse BetaCO BetaCO D (m2 s_1) D (m2 s_1) 883 C18O 1 (5.33 ± 0.76) × 10_8c (5.72 ± 0.82) × 10_8 / / C18O 0.3 (1.49 ± 0.15) × 10_7 (1.63 ± 0.17) × 10_7 / / C18O 0.05 (3.12 ± 0.62) × 10_7 (3.37 ± 0.66) × 10_7 / / 853 C18O 1 (3.46 ± 0.14) × 10_8 (3.71 ± 0.16) × 10_8 / / C18O 0.3 (1.10 ± 0.21) × 10_7 (1.15 ± 0.19) × 10_7 / / C18O 0.05 (2.27 ± 0.25) × 10_7 (2.40 ± 0.28) × 10_7 / / 803 C18O 1 (2.13 ± 0.47) × 10_8 (2.28 ± 0.48) × 10_8 / / C18O 0.3 (6.11 ± 1.20) × 10_8 (6.55 ± 1.18) × 10_8 / / C18O 0.05 (1.71 ± 0.16) × 10_7 (1.83 ± 0.16) × 10_7 / / 753 C18O 0.3 (4.20 ± 0.26) × 10_8 (4.48 ± 0.25) × 10_8 / / 703 C18O 0.3 / / (1.63 ± 0.13) × 10_24 (1.57 ± 0.14) × 10_24 673 C18O 0.3 / / (1.14 ± 0.12) × 10_24 (1.19 ± 0.11) × 10_24 643 C18O 0.3 / / (7.00 ± 0.92) × 10_25 (7.97 ± 1.05) × 10_25 743 H218O 0.1 / / (2.31 ± 0.74) × 10_23 (2.54 ± 0.82) × 10_23 673 H218O 0.1 / / (3.81 ± 1.24) × 10_24 (4.23 ± 1.35) × 10_24 648 H218O 0.1 / / (1.21 ± 0.48) × 10_24 (1.45 ± 0.52) × 10_24 623 H218O 0.1 / / (1.28 ± 0.32) × 10_24 (1.53 ± 0.34) × 10_24