Modeling of liquid water on CM meteorite parent bodies and implications for amino acid racemization
Modeling of liquid water on CM meteorite parent bodies and implications for amino acid racemization
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DOI：
10.1006/icar.2000.6329
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发表时间：
2000-06-01
期刊：
影响因子：
3.2
通讯作者：
Coker, RF
中科院分区：
文献类型：
--
作者：
Cohen, BA;Coker, RF
我们已经构建了一个小行星模型，目的是跟踪整个100公里直径的CM型母体的温度和成分的径向和时间依赖性，重点是限制温度和持续时间的液态水相，我们产生一个不均匀的分布，液态水持续时间最长，最热的最深的区域和风化层从来没有看到适当的条件，含水蚀变。我们将液态水特性的模型预测应用于氨基酸的进化。在母体的某些区域，氨基酸发生的变化很小，但对于大多数小行星来说，完全的外消旋化甚至破坏发生。我们试图将我们的热模型结果与CM陨石观测结果相匹配，但到目前为止，我们的模型并没有产生与这些观测结果完全一致的场景。(C)北京大学出版社.
We have constructed an asteroid model with the intent of tracking the radial and temporal dependence of temperature and composition throughout a 100-km-diameter CM-type parent body, with emphasis on constraining the temperature and duration of a liquid water phase, We produce a nonuniform distribution where liquid water persists longest and is hottest in the deepest zones and the regolith never sees conditions appropriate to aqueous alteration. We apply the model predictions of the liquid water characteristics to the evolution of amino acids. In some regions of the parent body, very little change occurs in the amino acids, but for the majority of the asteroid, complete racemization or even destruction occurs. We attempt to match our thermal model results with CM meteorite observations, but thus far, our model does not produce scenarios that are fully consistent with these observations. (C) 2000 Academic Press.