Evidence for landslides in Sisyphi Cavi (Noachis Terra, Mars): Slope evolution and role of endogenous preparatory factors

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
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Abstract

The surface of Mars is characterized by the presence of numerous gravity-induced processes and mass movements with greatly variable sizes and peculiarities. Detailed geomorphological studies have recently made it possible to identify many landslide-like landforms along the slopes bordering pits of Sisyphi Cavi in Noachis Terra, the southern hemisphere of Mars. These pieces of evidence are generally characterized by extended trenches, sometimes associated with uphill- or downhill-facing scarps. In this study, the gravity-induced processes observed in this region of Mars, and especially those present in a closed pit of the eastern sector, are described for the first time. A quantitative stress-strain analysis was performed, and it excludes a type of deformation process that could invoke creep processes (“viscosity-driven”) but rather favors instability induced by stress-perturbations in the slope more concentrated over time (“force-driven”). In particular, we performed a parametric analysis on both viscosity and stiffness parameters of the materials involved. It demonstrates that the time necessary for the rheological evolution of deformational processes associated with the observed landforms are compatible with genesis of short-term instabilities. This finding has significant implications for the origin of the depressed forms within and close to the study area, which are characterized by unstable slopes present at their edges. It is therefore not necessary to invoke the role of “viscosity-driven” creep processes to explain the origin of the shapes associated with the observed gravity-induced slope instabilities. The reported results drive towards a new interpretative scenario of morphological evolution of the widespread pits in the study area in terms of efficiency of endogenous processes (such as hypabyssal magmatism) which characterize the studied area of Mars, even if it is not possible to exclude the role of exogenous processes.

Sisyphi Cavi(火星 Noachis Terra)山体滑坡的证据:斜坡演变和内源准备因素的作用
火星表面的特点是存在着许多由重力引起的过程和大规模运动,其规模和特点千差万别。最近,通过详细的地貌研究,可以在火星南半球 Noachis Terra 的 Sisyphi Cavi 坑边的斜坡上发现许多类似滑坡的地貌。这些证据的一般特征是延伸的壕沟,有时与上坡或下坡的疤痕有关。本研究首次描述了在火星这一区域观察到的重力诱导过程,特别是在东区一个封闭坑中出现的过程。我们进行了应力-应变定量分析,排除了可能引起蠕变的变形过程("粘度驱动"),而倾向于斜坡应力扰动随着时间的推移更加集中所引起的不稳定性("力驱动")。我们特别对相关材料的粘度和刚度参数进行了参数分析。结果表明,与观测到的地貌相关的变形过程的流变演变所需的时间与短期不稳定性的产生是一致的。这一发现对研究区内和附近的凹陷地貌的起源具有重要意义,这些地貌的特点是其边缘存在不稳定斜坡。因此,没有必要援引 "粘度驱动 "的蠕变过程来解释与观测到的重力诱发的斜坡不稳定性相关的形状的起源。尽管不可能排除外源过程的作用,但所报告的结果从内源过程(如下深成岩岩浆作用)的效率角度,对研究地区大面积凹坑的形态演变提出了新的解释方案,这也是所研究的火星地区的特点。
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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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