This study aimed to determine the volatile content (Cl, F, OH) and hydrogen isotope (D/H) ratios of apatite grains within the Martian meteorite NWA 11522, a paired stone of the ungrouped polymict breccia NWA 7034. Apatite F:Cl:OH ratios were measured via SEM‐EDS analyses, and found to be strikingly similar in all grains, and dominated by Cl. Apatite D/H ratios were measured in situ via the Cameca ims 1280 SIMS at the University of Hawai'i. Results varied between δD values of 782 and 52 ‰ and between water contents of 0.127 and 0.510 wt%. The data form a mixing line between two endmembers. The first endmember, a high D/H ratio and low water content endmember, represents a fluid present during the thermal event that lithified the breccia at 1.5 Ga, resetting apatite volatile content, D/H ratio, and U‐Pb ages at this time. The D/H ratio of this fluid suggests that it was derived from the crust/cryosphere (e.g., melted groundwater ice). The second endmember, a low D/H ratio and high water content endmember, represents a second Martian fluid that interacted with the breccia after lithification. The low D/H ratio of this later fluid indicates it was derived from the deeper Martian interior, and may be evidence of an impact‐related hydrothermal system on Mars during the Amazonian period. The presence of these fluids within NWA 11522 suggests that subsurface impact crater environments were still host to liquid water during the past 1.5 Ga on Mars, and still could be to this day.

中文翻译：

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火星玄武角砾岩中磷灰石的挥发性丰度和氢同位素比NWA 11522—NWA 7034的配对石

这项研究旨在确定火星陨石NWA 11522中的磷灰石晶粒的挥发性含量（Cl，F，OH）和氢同位素（D / H）比，这是未分组的多晶角砾岩角砾岩NWA 7034的配对石。磷灰石F：Cl：通过SEM-EDS分析测量了OH的比率，发现所有谷物中的OH比率非常相似，并且以Cl为主。通过夏威夷大学的Cameca ims 1280 SIMS原位测量了磷灰石的D / H比。结果δ之间变化d值是782和52‰，水含量在0.127和0.510 wt％之间。数据在两个末端成员之间形成一条混合线。第一个端构件是高D / H比和低水含量的端构件，表示在热事件期间存在的一种流体，该流体在1.5 Ga下使角砾岩石化，此时磷灰石挥发物含量，D / H比和U-Pb年龄重新设定。 。该流体的D / H比表明它来自地壳/冰层（例如融化的地下水冰）。第二端构件，即低D / H比和高含水量的端构件，代表了第二火星流体，它在石化后与角砾岩相互作用。后来这种流体的低D / H比表明它来自更深的火星内部，并且可能是亚马逊时期火星上与冲击有关的热液系统的证据。