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DOI | 10.1038/s41561-017-0012-5 |
Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water | |
Dundas, Colin M.1; McEwen, Alfred S.2; Chojnacki, Matthew2; Milazzo, Moses P.1; Byrne, Shane2; McElwaine, Jim N.3,4; Urso, Anna2 | |
2017-12-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England |
英文摘要 | Recent liquid water flow on Mars has been proposed based on geomorphological features, such as gullies. Recurring slope lineae - seasonal flows that are darker than their surroundings - are candidate locations for seeping liquid water on Mars today, but their formation mechanism remains unclear. Topographical analysis shows that the terminal slopes of recurring slope lineae match the stopping angle for granular flows of cohesionless sand in active Martian aeolian dunes. In Eos Chasma, linea lengths vary widely and are longer where there are more extensive angle-of-repose slopes, inconsistent with models for water sources. These observations suggest that recurring slope lineae are granular flows. The preference for warm seasons and the detection of hydrated salts are consistent with some role for water in their initiation. However, liquid water volumes may be small or zero, alleviating planetary protection concerns about habitable environments. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416858000010 |
WOS关键词 | SEASONAL FLOWS ; SURFACE ; RSL ; PERCHLORATE ; BRINES ; DELIQUESCENCE ; CONSTRAINTS ; SUBSURFACE ; ICE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34782 |
专题 | 地球科学 气候变化 |
作者单位 | 1.US Geol Survey, Astrogeol Sci Ctr, Flagstaff, AZ 86001 USA; 2.Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA; 3.Univ Durham, Dept Earth Sci, Durham, England; 4.Planetary Sci Inst, Tucson, AZ USA |
推荐引用方式 GB/T 7714 | Dundas, Colin M.,McEwen, Alfred S.,Chojnacki, Matthew,et al. Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water[J]. NATURE GEOSCIENCE,2017,10(12). |
APA | Dundas, Colin M..,McEwen, Alfred S..,Chojnacki, Matthew.,Milazzo, Moses P..,Byrne, Shane.,...&Urso, Anna.(2017).Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water.NATURE GEOSCIENCE,10(12). |
MLA | Dundas, Colin M.,et al."Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water".NATURE GEOSCIENCE 10.12(2017). |
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