Arid
DOI10.1016/j.pss.2018.06.007
Fluvial or aeolian grains? Separation of transport agents on Mars using earth analogue observations
Kapui, Zs1; Kereszturi, A.2; Kiss, K.3; Szalai, Z.3; Ujvari, G.1; Hickman-Lewis, K.4,5; Foucher, F.4; Westall, F.4
通讯作者Kapui, Zs
会议名称1st IUGG Symposium on Planetary Science (IUGG-PS) - Interdisciplinary Observation and Understanding of the Solar System
会议日期JUL 03-05, 2017
会议地点Berlin, GERMANY
英文摘要

The particle size, shape, surface texture and composition of aeolian and fluvial sedimentary samples were analyzed and compared using optical microscope-based automatized image analysis, in order to suggest indicators that could discriminate these two modes of transport on Mars. The principal goal is to assess if such indicators - established on Earth - could be used on Mars thereby aiding interpretations on the origin of sediments analysed by the ExoMars 2020 rover during its mission. Wind and water transported sand from, respectively, the Sahara Desert and the Maros river bar in Hungary were investigated and treated as mainly aeolian and fluvial end-members. In addition, two Mars-analogue aeolian and fluvial basaltic sediments from Iceland were analysed similarly.


Our analyses demonstrated that useful parameters for the distinction of aeolian and fluvial transport included the degree of sorting, the grain diameter/perimeter ratio, the circularity (reflecting the sphericity of the grains) and convexity (showing roughness of the grains) of particles. Mature aeolian sands are always well-sorted with high diameter/perimeter ratios since they are dominated by rounded grains. Differences were observed in both surface textures and the range of mineral compositions, wherein the aeolian samples reflect a more mature state. Separation of the two Icelandic samples with different origins was less straightforward due to both shorter transport distances and the fact that the fluvial sample was made of scoria, although the intermixing of grains with a probable aeolian origin could be also determined. The characteristics of grain size and shape parameters are potential indicators allowing the separation of the two transport modes, and their determination is shown to be feasible based on high resolution Close-UP Imager (CLUPI) observations. Nonetheless, knowledge of the geological context - for instance sedimentary facies, layering, sorting of the sediments and grain shape - is a requirement for proper interpretations. These sedimentary features could be party determined by MaMISS, CLUPI and PanCam observations. Differences between aeolian and fluvial grains are expected to be more pronounced on Mars than on Earth due to the episodic and likely short-term subaqueous transport, as opposed to the long-term activity of wind. However, future interpretations of the ExoMars 2020 rover images of martian sedimentary grains will be hampered by the limited knowledge of fluvial/aeolian transport on Mars. Based on our results, future research should focus on determining the dominant transport mode of any sediment and the degree of grain mixing, which strongly based on the transport mode.


来源出版物PLANETARY AND SPACE SCIENCE
ISSN0032-0633
出版年2018
卷号163
页码56-76
出版者PERGAMON-ELSEVIER SCIENCE LTD
类型Article;Proceedings Paper
语种英语
国家Hungary;France;Italy
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000450381700006
WOS关键词SCANNING-ELECTRON-MICROSCOPY ; SPATIAL VARIABILITY ; SIZE DISTRIBUTION ; VOLCANIC SANDS ; RIVER-BASIN ; QUARTZ ; SEDIMENT ; SURFACE ; DEPOSITS ; FEATURES
WOS类目Astronomy & Astrophysics
WOS研究方向Astronomy & Astrophysics
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/307252
作者单位1.MTA Res Ctr Astron & Earth Sci, Inst Geol & Geochem Res, Budaorsi Str 45, H-1112 Budapest, Hungary;
2.MTA Res Ctr Astron & Earth Sci, Konkoly Observ, 15-17 Rd Konkoly Thege Miklos, H-1121 Budapest, Hungary;
3.MTA Res Ctr Astron & Earth Sci, Geog Inst, 45 Rd Budaorsi, H-1112 Budapest, Hungary;
4.CNRS, Ctr Biophys Mol, Rue Charles Sadron, F-45071 Orleans 2, France;
5.Univ Bologna, Dipartmento Sci Biol Geol & Ambientale, Bologna, Italy
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Kapui, Zs,Kereszturi, A.,Kiss, K.,et al. Fluvial or aeolian grains? Separation of transport agents on Mars using earth analogue observations[C]:PERGAMON-ELSEVIER SCIENCE LTD,2018:56-76.
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