Oxygen isotopic composition of our solar system is believed to have resulted from mixing of two isotopically distinct nebular reservoirs, ~(16)O-rich and ~(17,18)O-rich relative to Earth. The nature and composition of the ~(17,18)O-rich reservoir are poorly constrained. We report an in situ discovery of a chemically and isotopically unique material distributed ubiquitously in fine-grained matrix of a primitive carbonaceous chondrite Acfer 094. This material formed by oxidation of Fe,Ni-metal and sulfides by water either in the solar nebula or on a planetesimal. Oxygen isotopic composition of this material indicates that the water was highly enriched in ~(17)O and ~(18)O (δ~(17,18)O_(SMOW) = +180per thousand per mil), providing the first evidence for an extremely ~(17,18)O-rich reservoir in the early solar system.
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机译：我们太阳系的氧同位素组成被认为是由两个同位素不同的星云型储层（相对于地球富〜（16）O和富〜（17,18）O）的混合产生的。富含〜（17,18）O的油藏的性质和成分受到的约束较弱。我们报告了一种化学和同位素独特材料的原位发现，该材料无处不在的原始碳质球粒陨石Acfer 094的细颗粒基质中分布。这种材料是由铁，镍金属和硫化物在太阳星云中或在水上被水氧化形成的一个小行星。该物质的氧同位素组成表明，水富含〜（17）O和〜（18）O（δ〜（17,18）O_（SMOW）= + 180per per per mil），这为水提供了第一个证据早期太阳系中极富（〜17,18）O的储层。
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