Magnesium isotopic composition of achondrites
作者： Fatemeh Sedaghatpour , Fang-Zhen Teng
DOI: 10.1016/J.GCA.2015.11.016
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摘要: Abstract Magnesium isotopic compositions of 22 well-characterized differentiated meteorites including 7 types achondrites and pallasite were measured to estimate the average Mg composition their parent bodies evaluate heterogeneity solar system. The δ26Mg values are −0.236‰ −0.190‰ for acapulcoite–lodranite angrite meteorites, respectively vary from −0.267‰ −0.222‰ in winonaite–IAB-iron silicate group, −0.369‰ −0.292‰ aubrites, −0.269‰ −0.158‰ HEDs, −0.299‰ −0.209‰ ureilites, −0.307‰ −0.237‰ mesosiderites, −0.303‰ −0.238‰ pallasites. most analyzed here similar reveal no significant fractionation. However, D′Orbigny (angrite) some HEDs slightly heavier than chondrites other studied here. angrites likely resulted either impact-induced evaporation or higher abundance clinopyroxene with olivine orthopyroxene. (δ26Mg = −0.246 ± 0.082‰, 2SD, n = 22) estimated is indistinguishable those Earth (δ26Mg = −0.25 ± 0.07‰; n = 139), (δ26Mg = −0.28 ± 0.06‰; n = 38), Moon (δ26Mg = −0.26 ± 0.16‰; n = 47) reported same laboratory. chondritic achondrites, Moon, further reflects homogeneity isotopes system lack isotope fractionation during planetary accretion process impact events.
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