| DOI: | 10.1038/s41561-020-0598-x
|
| 论文题名: | Geomorphological evidence for a dry dust avalanche origin of slope streaks on Mars |
| 作者: | Dundas C.M.
|
| 刊名: | Nature Geoscience
|
| ISSN: | 17520894
|
| 出版年: | 2020
|
| 卷: | 13, 期:7 | | 起始页码: | 473
|
| 结束页码: | 476
|
| 语种: | 英语
|
| 英文关键词: | aqueous solution
; geomorphology
; image analysis
; image resolution
; Mars
; planetary atmosphere
|
| 英文摘要: | 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. © 2020, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply. |
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/169582
|
| Appears in Collections: | 气候变化与战略
|
|
There are no files associated with this item.
|
|
作者单位: | Astrogeology Science Center, US Geological Survey, Flagstaff, AZ, United States
|
| Recommended Citation: | |
Dundas C.M.. Geomorphological evidence for a dry dust avalanche origin of slope streaks on Mars[J]. Nature Geoscience,2020-01-01,13(7)
|
|
|