论文标题
部分可观测时空混沌系统的无模型预测
Sulfuric acid as a cryofluid and oxygen isotope reservoir of planetesimals
论文作者
论文摘要
与地球和月亮$^{1} $相比，太阳在$^{17,18} $ o中表现出耗竭。自1970年代三异位分析$^{2} $以来，这种非依赖性同位素分馏的起源已广泛争论。已经建议在太阳系的母体分子云中针对紫外光子的$^{3,4} $作为非质量依赖效应的来源，其中$^{17,18} $ o-o-o-enriched氧被冰捕获，并被选择地掺入水中，并将其作为冰含量融合到Planet-form formort forplane formost forplane forplane $^5} $^5}中。事实是，地月和其他行星物体在其同位素组合物中偏离了约6％的阳光。一个令人惊叹的例外是Acfer 094陨石中发现的磁铁矿/硫化物符号岩，该陨石显示出$^{17,18} $ o相对于太阳$^{6} $的24％富集。水不能解释这么高的富集。在这里，我们证明了分子云中的So和$ _2 $分子，〜106％富含$^{17,18} $相对于太阳，通过原球星盘和行星阶段演变为硫酸，成为硫酸，富含硫酸，在$^{17,18} $ o中富含24％。硫酸在地球上提供了一个冷冻流体环境，并与铁铁自身反应形成了无定形铁二氧硫酸盐 - 水合液，最终通过冲击将其分解为Sympletite。我们指出，自分子云的日子以来，Acfer-094 s旋石及其祖细胞硫酸与太阳系中的材料演化强烈结合。
The Sun exhibits a depletion in $^{17,18}$O relative to $^{16}$O by 6 % compared to the Earth and Moon$^{1}$. The origin of such a non-mass-dependent isotope fractionation has been extensively debated since the three-isotope-analysis$^{2}$ became available in 1970's. Self-shielding$^{3,4}$ of CO molecules against UV photons in the solar system's parent molecular cloud has been suggested as a source of the non-mass-dependent effect, in which a $^{17,18}$O-enriched oxygen was trapped by ice and selectively incorporated as water into planet-forming materials$^{5}$. The truth is that the Earth-Moon and other planetary objects deviate positively from the Sun by ~6 % in their isotopic compositions. A stunning exception is the magnetite/sulfide symplectite found in Acfer 094 meteorite, which shows 24 % enrichment in $^{17,18}$O relative to the Sun$^{6}$. Water does not explain the enrichment this high. Here we show that the SO and SO$_2$ molecules in the molecular cloud, ~106 % enriched in $^{17,18}$O relative to the Sun, evolved through the protoplanetary disk and planetesimal stages to become a sulfuric acid, 24 % enriched in $^{17,18}$O. The sulfuric acid provided a cryofluid environment in the planetesimal and by itself reacted with ferric iron to form an amorphous ferric-hydroxysulfate-hydrate, which eventually decomposed into the symplectite by shock. We indicate that the Acfer-094 symplectite and its progenitor, sulfuric acid, is strongly coupled with the material evolution in the solar system since the days of our molecular cloud.
