Jurnal Internasional Tidak ada fraksi isotop kalsium terukur selama kristalisasi danau lava Kilauea Iki – Zhang – Geokimia, Geofisika, Geosystems

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Jurnal Internasional Tidak ada fraksi isotop kalsium terukur selama kristalisasi danau lava Kilauea Iki – Zhang – Geokimia, Geofisika, Geosystems

International Journal

 No measurable calcium isotope fraction during crystallization of Kilauea Iki - Zhang lava lake - Geochemistry, Geophysics, Geosystems 
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To investigate the possibility of Ca isotope fractionation during basaltic magmadifferentiation, we measured the isotope composition of Ca from lava taken from Kilauea Iki lava lake in Hawaii. This set of lava records the entire history of crystal fractionation from basaltic magma, starting from olivine / fractionation accumulation to several crystallization phases, including plagioclase and clinopyroxene. Our results show that no Ca isotopes can be detected variations in all Kilauea lava measured at precision ± 0.07 7 for 44 Ca / 40 Ca (δ 44/40 Ca = 0.80 ± 0 , 08, 2SD, n = 19). Use these observations and publish Ca Inter-minerals Isotope fractionation factors, a Monte Carlo approach is used to estimate mineral-melting 44 Ca / 40 Ca fractionation factor. We found that Ca isotope fractionation between klinopyroxene and a small melt, with 1945 44/40 Ca cpx - melt = 0.04 ± 0.03at 1200 ° C, using the specified inter-mineral isotope fractionation factor. with two different approaches. To the best of our knowledge, this is the first estimate Ca mineral immersion isotopic pollution factors reported. We use this estimated 1945 44/40 Ca cpx - melt and inter-mineral isotopic fractionation factor Ca to investigate Ca isotope effects during partial coating of mantles below 1-2 GPa. Our simulation shows the biggest 44 Ca / 40 The effect of Ca, up to + 0.3 ‰, is achieved in a large degree of melting residue during fractions and dynamic melting. In contrast, partial melting shows were ignored 44 Ca / 40 Ca isotope effects,

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