Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.1016/j.geomorph.2019.106897 |
| New types of boulder accumulations in the hyper-arid Atacama Desert | |
| Sager, Christof1; Airo, Alessandro1; Arens, Felix L.1; Rabethge, Carolin2; Schulze-Makuch, Dirk1,3,4,5 | |
| 通讯作者 | Sager, Christof |
| 来源期刊 | GEOMORPHOLOGY
 |
| ISSN | 0169-555X |
| EISSN | 1872-695X |
| 出版年 | 2020 |
| 卷号 | 350 |
| 英文摘要 | The accumulation of thousands of boulder-sized clasts into boulder fields in the Atacama Desert has been linked to seismic-driven downslope transport, a rare sedimentary process corroborated by this study. We surveyed boulder arrangements occurring in the Atacama Desert and identified three accumulation types for further investigation: a small circular boulder cluster (BC), a long channelized boulder stream (BS), and a wide convex-shaped boulder field (BF). Drone-based photogrammetric techniques and field observations were used to generate high-quality digital elevation models and orthophotos to determine boulder count, size, coverage, orientation, lithology and local topography. Our data shows that the arrangement of boulder accumulations corresponds with the shape of the accommodation space and the boulder input, where BCs occur at the center of completely confined topographic depressions, BSs occur along laterally confined and incised hill slopes with boulders stacked above each other, and BFs occur on largely unconfined shallow and low-relief slopes with a distinct boulder front. A general downslope increase of average boulder size and coverage was measured in all boulder accumulations and a long-axis orientation of boulders parallel to the transport direction was observed for the BS. Based on these results and the lack of fluvial transport indicators, we conclude that transport and arrangement of boulder accumulations are largely controlled by the interplay of topography and seismic-driven boulder transport, resulting in unique landscape features present in the hyper-arid Atacama Desert. Such sedimentary transport processes are rare on Earth but potentially play a greater role on other arid planetary surfaces that are covered by boulders and subject to sufficient seismic activity. (C) 2019 The Author(s). Published by Elsevier B.V. |
| 英文关键词 | Hyper-arid Atacama Desert Boulder Seismic Mars |
| 类型 | Article |
| 语种 | 英语 |
| 国家 | Germany ; USA |
| 开放获取类型 | hybrid, Green Published |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000532088300016 |
| WOS关键词 | ONSET |
| WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
| WOS研究方向 | Physical Geography ; Geology |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/318844 |
| 作者单位 | 1.Tech Univ Berlin, Zentrum Astron & Astrophys, Berlin, Germany; 2.Free Univ Berlin, Inst Geol Sci, Berlin, Germany; 3.Leibniz Inst Freshwater Ecol & Inland Fisheries I, Dept Expt Limnol, Stechlin, Germany; 4.GFZ German Res Ctr Geosci, Sect Geomicrobiol, Potsdam, Germany; 5.Washington State Univ, Sch Environm, Pullman, WA 99164 USA |
| 推荐引用方式 GB/T 7714 | Sager, Christof,Airo, Alessandro,Arens, Felix L.,et al. New types of boulder accumulations in the hyper-arid Atacama Desert[J],2020,350. |
| APA | Sager, Christof,Airo, Alessandro,Arens, Felix L.,Rabethge, Carolin,&Schulze-Makuch, Dirk.(2020).New types of boulder accumulations in the hyper-arid Atacama Desert.GEOMORPHOLOGY,350. |
| MLA | Sager, Christof,et al."New types of boulder accumulations in the hyper-arid Atacama Desert".GEOMORPHOLOGY 350(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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