Raman spectroscopic documentation of Mars analog basalt alteration by brines
Raman spectroscopic documentation of Mars analog basalt alteration by brines
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DOI：
10.1016/j.icarus.2022.115111
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发表时间：
2022-05
期刊：
影响因子：
3.2
通讯作者：
Andrew Rodriguez;L. Hunt;C. Phillips‐Lander;D. Mason;M. Madden
中科院分区：
文献类型：
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作者：
Andrew Rodriguez;L. Hunt;C. Phillips‐Lander;D. Mason;M. Madden
盐和玄武岩在火星表面分布广泛。因此，玄武岩-卤水相互作用可能对地球的水历史和近地表蚀变组合产生重大影响。拉曼光谱是从McKinney玄武岩样品中收集的，这些样品浸泡在由Na-Cl-H2O、Na-SO 4-H2O、Na-ClO 4-H2O、Mg-Cl-H2O、Mg-SO 4-H2O和两种盐混合物（Mg-Cl-SO 4-H2O和Na-ClO 4-SO 4-H2O）组成的八种近饱和盐水以及超纯水中长达一年。在拉曼光谱中观察到次生矿物，包括氧化铁、水合硫酸盐、无定形二氧化硅、磷酸盐和碳酸盐。这些次生矿物的检测证明了拉曼光谱学在识别火星上玄武岩-卤水蚀变组合方面的实用性。这项工作还表明，主要类别的蚀变阶段可以区分使用拉曼光谱的分辨率类似于预期的拉曼仪器搭载的毅力和罗莎琳德富兰克林火星漫游者。此外，在蚀变组合的碳酸盐矿物的观察表明，从大气中的CO2容易与离子反应，从玄武岩中释放的近饱和盐水蚀变过程中。
Salts and basalt are widespread on the surface of Mars. Therefore, basalt-brine interactions may have significant effects on both the aqueous history of the planet, and near-surface alteration assemblages. Raman spectra were collected from McKinney Basalt samples that were immersed in eight near-saturated brines composed of Na-Cl-H2O, Na-SO4-H2O, Na-ClO4-H2O, Mg-Cl-H2O, Mg-SO4-H2O, and two salt mixtures (Mg-Cl-SO4-H2O and Na-ClO4-SO4-H2O), as well as ultra-pure water for up to one year. Secondary minerals were observed in the Raman specta, including iron oxides, hydrated sulfates, amorphous silica, phosphates, and carbonates. Detection of these secondary minerals demonstrates the utility of Raman spectroscopy to identify basalt-brine alteration assemblages on Mars. This work also demonstrates that major classes of alteration phases can be distinguished using Raman spectra with resolution similar to those expected from the Raman instruments aboard the Perseverance and Rosalind Franklin Mars rovers. In addition, observations of carbonate minerals within alteration assemblages suggest CO2from the atmosphere readily reacted with ions released from the basalt during alteration in near-saturated brines.