Fine‐scale (submillimeter to centimeter) depositional and diagenetic features encountered during the Curiosity rover's traverse in Gale crater provide a means to understand the geologic history of Vera Rubin ridge (VRR). VRR is a topographically high feature on the lower north slope of Aeolis Mons, a 5‐km high stratified mound within Gale crater. We use high‐spatial resolution images from the Mars Hand Lens Imager (MAHLI) as well as grain sizes estimated with the Gini index mean score technique that uses ChemCam Laser‐Induced Breakdown Spectroscopy (LIBS) chemical data to constrain the postdepositional history of the strata exposed on this ridge. MAHLI images were used to examine the color, grain size, and style of lamination of the host rocks, as well as to explore the occurrence of nodules, diagenetic crystals, pits, and a variety of dark‐gray iron‐rich features. This survey revealed abundant and widespread diagenetic features within the rocks exposed on VRR and demonstrated that rock targets estimated to be coarser generally contain more diagenetic features than those estimated to have finer grains, which indicate that grain size may have influenced the degree and type of diagenesis. A subset of rocks within VRR are gray in color and exhibit the highest proportion of diagenetic features. We suggest that these targets experienced a different diagenetic history than the other rocks on VRR and hypothesize that redistribution and recrystallization of iron within specific intervals may have resulted in both the gray color and the abundance of dark‐gray iron‐rich diagenetic features.

中文翻译：

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火星维拉·鲁宾岭，大风火山口的精细尺度特征揭示了成岩作用

好奇期遇到的精细尺度（亚毫米到厘米）沉积和成岩特征漫游者在大风火山口中的穿越提供了一种了解维拉·鲁宾岭（VRR）地质历史的方式。VRR是Aeolis Mons下北坡的高地形特征，Aeolis Mons是Gale陨石坑内5 km高的分层丘。我们使用来自Mars Hand Lens Imager（MAHLI）的高空间分辨率图像，以及通过基尼指数均值技术估算的晶粒尺寸，该技术使用ChemCam激光诱导击穿光谱（LIBS）化学数据来约束地层的沉积后历史。暴露在这个山脊上。MAHLI图像用于检查主体岩石的颜色，晶粒大小和层状样式，以及探查结核，成岩晶体，凹坑和各种深灰铁富集特征的发生。这项调查揭示了在VRR上暴露的岩石中丰富而广泛的成岩特征，并表明估计较粗的岩石目标通常比估计具有较细晶粒的岩石具有更多的成岩特征，这表明晶粒尺寸可能影响了成岩的程度和类型。 。VRR中的一部分岩石为灰色，并显示出最高比例的成岩特征。我们建议这些靶标经历的成岩史与VRR上其他岩石不同，并假设铁在特定间隔内的重新分布和重结晶可能导致灰色和丰富的深灰色富铁成岩特征。