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<b>Abstract</b>— <p>The article presents the results of an analysis of the distribution of chlorine on the surface and in the near-surface layer of sedimentary rocks in the Martian crater Gale, which was studied by the Curiosity rover, based on measurements taken using the Russian scientific equipment DAN and the APXS spectrometer. The distribution of chlorine was considered as a possible marker of processes that played a significant role at different stages of the evolution of the Martian climate. It was found that the vicinity and base of the Mount Sharp sedimentary mountain with river and lake deposits, as well as higher and younger areas that correspond to the transition to hydrated sulfate deposits, can have a uniform distribution of chlorine by depth (up to 50&#xa0;cm). At the same time, areas located between these two groups, where hematite and clay deposits were found, show a sharp heterogeneity in the distribution of chlorine, with higher chlorine concentrations at the surface itself. This may indicate that in the first case, one source of chlorine transfer, possibly related to water activity, was dominant, while in the second case, there may have been several such sources.</p>

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Depth Distribution of Chlorine Content for Different Geological Areas in the Crater Gale According to DAN and APXS Instruments

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月10日

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  • M. L. Litvak,
  • A. E. Romanova,
  • I. G. Mitrofanov,
  • M. V. Dyachkova,
  • D. I. Lisov,
  • S. Yu. Nikiforov

摘要

Abstract—

The article presents the results of an analysis of the distribution of chlorine on the surface and in the near-surface layer of sedimentary rocks in the Martian crater Gale, which was studied by the Curiosity rover, based on measurements taken using the Russian scientific equipment DAN and the APXS spectrometer. The distribution of chlorine was considered as a possible marker of processes that played a significant role at different stages of the evolution of the Martian climate. It was found that the vicinity and base of the Mount Sharp sedimentary mountain with river and lake deposits, as well as higher and younger areas that correspond to the transition to hydrated sulfate deposits, can have a uniform distribution of chlorine by depth (up to 50 cm). At the same time, areas located between these two groups, where hematite and clay deposits were found, show a sharp heterogeneity in the distribution of chlorine, with higher chlorine concentrations at the surface itself. This may indicate that in the first case, one source of chlorine transfer, possibly related to water activity, was dominant, while in the second case, there may have been several such sources.