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Alien Aeolian Bedforms: a Comparative Sedimentary Analysis of the Dingo Gap Bedform and Hidden Valley Ripple Traverses, Gale Crater, Mars
Journal of Geophysical Research: Planets ( IF 4.8 ) Pub Date : 2021-08-12 , DOI: 10.1029/2021je006904
Jordan M. Bretzfelder 1 , Mackenzie Day 1
Affiliation  

At the end of January 2014 (Sols 528-540), the Mars Science Laboratory rover Curiosity approached the a valley opening known as Dingo Gap. Spanning this gap was an unusual bedform with a maximum height of 1.34 m and a maximum width of ∼8 m. Curiosity encountered, imaged, and successfully traversed this atypical bedform. In August of 2014, Curiosity began to traverse a field of ripples in Hidden Valley, but was forced to abort the attempt due to high wheel slip. The Hidden Valley ripples are ∼1/6 of the height of the Dingo Gap bedform, and yet posed a serious hazard to the rover. Here, we present a sedimentological analysis of the Dingo Gap bedform and the Hidden Valley ripples and discuss how their differences may have impacted rover traversability. The Dingo Gap and Hidden Valley bedforms are morphologically similar to many commonly observed bedforms on Mars that have few clear analogs on Earth, and Curiosity's encounters provide a framework for studying these bedforms in detail. Furthermore, the rover tracks across the bedforms have persisted for >5 Earth years, even through a global dust storm. The longevity of the tracks demonstrates that on multi-year timescales 1) sediment transport on some Martian bedforms is inactive or slow enough that areas disturbed by the rover are not resurfaced, and 2) the rate of dust deposition on the Martian surface, even after a global dust storm, is too low to create an optically thick layer.

中文翻译:

Alien Aeolian Bedforms:Dingo Gap Bedform 和Hidden Valley Ripple Traverses、Gale Crater、Mars 的比较沉积分析

2014 年 1 月末(Sols 528-540),火星科学实验室的好奇号火星车接近了一个名为 Dingo Gap 的山谷开口。跨越这个间隙的是一个不寻常的床型,最大高度为 1.34 m,最大宽度约为 8 m。好奇号遇到、成像并成功穿越了这种非典型的床型。2014 年 8 月,好奇号开始穿越隐谷的一片涟漪,但由于车轮滑移率高而被迫中止尝试。隐谷涟漪约为 Dingo Gap 床型高度的 1/6,但对漫游车构成严重危害。在这里,我们对 Dingo Gap 地貌和隐谷涟漪进行了沉积学分析,并讨论了它们的差异可能如何影响漫游车的可穿越性。Dingo Gap 和 Hidden Valley 地貌在形态上与火星上许多常见的地貌相似,在地球上几乎没有明显的类似物,好奇号的遭遇为详细研究这些地貌提供了框架。此外,即使经历了全球沙尘暴,火星车穿越地床的轨迹已经持续了 5 个地球年以上。轨道的寿命表明,在多年的时间尺度上 1) 一些火星地床的沉积物运输不活跃或足够慢,以至于火星车扰动的区域不会重新浮出水面,以及 2) 火星表面的灰尘沉积率,即使在全球沙尘暴太低,无法形成光学厚层。即使经历了全球性沙尘暴,火星车穿越地床的轨迹已经持续了 5 个地球年以上。轨道的寿命表明,在多年的时间尺度上 1) 一些火星地床的沉积物运输不活跃或足够慢,以至于火星车扰动的区域不会重新浮出水面,以及 2) 火星表面的灰尘沉积率,即使在全球沙尘暴太低,无法形成光学厚层。即使经历了全球沙尘暴,火星车穿越地床的轨迹已经持续了 5 个地球年以上。轨道的寿命表明,在多年的时间尺度上 1) 一些火星地床的沉积物运输不活跃或足够慢,以至于火星车扰动的区域不会重新浮出水面,以及 2) 火星表面的灰尘沉积率,即使在全球沙尘暴太低,无法形成光学厚层。
更新日期:2021-08-13
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