Olivine is a principal anhydrous silicate mineral in chondritic meteorites. The structure of this mineral is composed of independent SiO₄ tetrahedra linked by divalent cations (mainly Mg). Under hydrothermal conditions, olivine is transformed into serpentine, which is a major hydrated phyllosilicate in the matrix of carbonaceous chondrites. Although carbonaceous chondrites contain various types of organic matter, the interaction between organic compounds and olivine at low temperature has not been considered in the literature. We performed an experiment to test the adsorption of N‐containing organic compounds (i.e., alkylpyridines and alkylimidazoles) on olivine using liquid chromatography under aqueous conditions (pH = 2.5–10.5) at 20–40 °C. The N‐containing cyclic compounds were interacted with the SiO₄ tetrahedra of olivine and their different adsorption abilities depended on the organic structures. Because alkylpyridines often occur at different locations than alkylimidazoles in carbonaceous chondrites, the results of this study suggest that olivine can separate the N‐containing compounds associated with aqueous fluid flows by asteroidal chromatography in the meteorite parent body. Liquid chromatography based on solid phase minerals may hence be a useful technique for simulating the behavior of organic compounds in carbonaceous asteroids under aqueous activity.

中文翻译：

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水性条件下有机化合物与橄榄石之间的相互作用：碳质球粒陨石中有机物分布的潜在作用

橄榄石是粒状陨石中的一种主要的无水硅酸盐矿物。这种矿物的结构由通过二价阳离子（主要是Mg）连接的独立SiO ₄四面体组成。在水热条件下，橄榄石转变为蛇纹石，蛇纹石是碳质球粒陨石基质中的主要水合页硅酸盐。尽管碳质球粒陨石包含各种类型的有机物，但文献中尚未考虑有机化合物与橄榄石在低温下的相互作用。我们进行了一项实验，使用液相色谱法在20–40°C的水性条件下（pH = 2.5–10.5），测试橄榄石上含N的有机化合物（即，烷基吡啶和烷基咪唑）的吸附。含N的环状化合物与SiO相互作用橄榄石的_4个四面体及其不同的吸附能力取决于有机结构。由于烷基吡啶与碳质球粒陨石中烷基咪唑的位置通常不同，因此这项研究的结果表明，橄榄石可以通过小行星色谱在陨石母体中分离与含水流体有关的含N化合物。因此，基于固相矿物的液相色谱法可能是一种有用的技术，用于模拟水性活性下碳质小行星中有机化合物的行为。