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DOI | 10.1038/s41561-020-0598-x |
Geomorphological evidence for a dry dust avalanche origin of slope streaks on Mars | |
Dundas, Colin M. | |
2020-06-29 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2020 |
卷号 | 13期号:7页码:473-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Patterns of erosion and deposition by some slope streaks on Mars are consistent with a dry dust avalanche origin, according to an analysis of orbital images before and after new streaks formed. Mars has several different types of slope feature that resemble aqueous flows. However, the current cold, dry conditions are inimical to liquid water, resulting in uncertainty about its role in modern surface processes. Dark slope streaks were among the first distinctive young slope features to be identified on Mars and the first with activity seen in orbital images. They form markings on steep slopes that can persist for decades, and the role of water in their formation remains a matter of debate. Here I analyse the geomorphic features of new slope streaks using high-resolution orbital images. Comparison of images before and after streak formation reveal how this process affects the surface and provides information about the cause. These observations demonstrate that slope streaks erode and deposit material in some instances. They also reveal that streaks can jump slopes and may be erosive very near their termini. These observations support a formation model where dark slope streaks form as ground-hugging, low-density avalanches of dry surface dust. Such streaks need not be treated as Special Regions for planetary protection. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000544997400007 |
WOS关键词 | LINEAE ; CAMERA ; FLOWS ; RATES |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/281789 |
专题 | 地球科学 气候变化 |
作者单位 | US Geol Survey, Astrogeol Sci Ctr, Flagstaff, AZ 86001 USA |
推荐引用方式 GB/T 7714 | Dundas, Colin M.. Geomorphological evidence for a dry dust avalanche origin of slope streaks on Mars[J]. NATURE GEOSCIENCE,2020,13(7):473-+. |
APA | Dundas, Colin M..(2020).Geomorphological evidence for a dry dust avalanche origin of slope streaks on Mars.NATURE GEOSCIENCE,13(7),473-+. |
MLA | Dundas, Colin M.."Geomorphological evidence for a dry dust avalanche origin of slope streaks on Mars".NATURE GEOSCIENCE 13.7(2020):473-+. |
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