Quantifying the water in all Martian water reservoirs is important for understanding the history of water on Mars, including Mars’ past climate and potential for habitability. Hydrated minerals are widespread on Mars and may comprise a significant portion of the water inventory. We calculated the possible volumes of water stored within and required to form hydrated minerals on Mars by estimating the weight percent (wt.%) water of ice‐free, near‐surface materials, the wt.% water required to form subsurface hydrated minerals, and the densities and thicknesses of rock units with hydrated minerals. We estimated the near‐surface wt.% water using Mars Odyssey Neutron Spectrometer and OMEGA 3 µm hydration feature surveys. We calculated the wt.% water required to form subsurface hydrated minerals by estimating: (1) percent occurrences of subsurface hydrated minerals using mineralogical crater surveys, (2) abundance per detection of hydrated minerals using published spectral unmixing results of hydrated mineral detections, and (3) the wt.% water required to form hydrated minerals using estimated masses and hydration states of hydrated minerals. We estimated the densities of rock units with hydrated minerals using prior crustal density estimates and measurements of sedimentary rock density in Gale Crater. We estimated the thicknesses of rock units with hydrated minerals using mineralogical crater surveys. Our best estimate for the volume of water stored within or required to form hydrated minerals on Mars is 130–260 m global equivalent layer (GEL) and our plausible range extends from 70–860 m GEL. Compared to other Martian reservoirs, hydrated minerals are a significant water sink.

中文翻译：

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火星水合矿物质：显着的水槽

量化所有火星水库中的水对于了解火星上的水历史，包括火星过去的气候和可居住性具有重要意义。水合矿物质在火星上分布广泛，可能占水存量的很大一部分。通过估算无冰，近地表物质的水的重量百分比（wt。％），形成地下水合矿物质所需的wt。％水，我们计算出在火星中储存并形成水合矿物质所需的水量，以及含有水合矿物的岩石单元的密度和厚度。我们使用火星奥德赛中子光谱仪和OMEGA 3 µm水化特征调查估算了近地表水的重量百分比。我们通过估算以下内容来计算形成地下水合矿物质所需的水的重量百分比：（1）使用矿物学陨石坑调查的地下水合矿物质的发生百分比；（2）使用公布的水合矿物质光谱解混结果，每次检测水合矿物质的丰度；以及（3）使用估计质量形成水合矿物质所需的水重量百分比和水合矿物质的水合状态。我们使用先前的地壳密度估算和大风火山口中沉积岩石密度的测量值来估算含水合矿物的岩石单元的密度。我们使用矿物学火山口调查估算了含有水合矿物的岩石单元的厚度。我们对在火星中储存或形成水合矿物质所需的水量的最佳估计是130-260 m全球当量层（GEL），我们的合理范围是70-860 m GEL。与其他火星水库相比，