Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.1016/j.geomorph.2019.106891 |
| Analysis of the origin, formation and development of sand ramps on the Eastern slopes of Shirkouh, Yazd, Central Iran | |
| Paichoon, Mohamad Sharifi | |
| 通讯作者 | Paichoon, Mohamad Sharifi |
| 来源期刊 | GEOMORPHOLOGY
 |
| ISSN | 0169-555X |
| EISSN | 1872-695X |
| 出版年 | 2020 |
| 卷号 | 351 |
| 英文摘要 | The purpose of this study is to examine the sand ramps in the margin of Ernan playa located in Yazd Province, central Iran. The region is marked with several sand ramps, many of which are not observable as they are buried under colluvial and alluvial sediments or dense vegetation. Field studies indicated at least 18 fairly large sand ramps in the region in the form of both climbing and falling dunes. These sand ramps were formed mostly in the past and are stable and inactive now. However, in some parts of the region in question, these landforms are still forming and developing. The results indicated that the sediment, especially those of the sand ramps on windward slopes, have large grains. Also, over 50 percent of the sediments generally have grains with a diameter of more than 1 mm. The presence of such minerals as Alkali Feldspar, Plagioclase, Quartz, Biotite, Muscovite, Amphibole, and Apatite, respectively in terms of quantity and frequency, in the sand ramp sediments indicates that the origin of sand ramp sediments is the monzogranites of the eastern slope of Shirkouh Mountain with the same texture and frequency. The very fact that the above-mentioned minerals are intact, i.e. they have not been rounded or eroded, suggests that these sediments have not been displaced a lot. The study of the developing sand ramps proved that such structures form at the height of more than 2400 m with two months of frost annually, over 100 mm of precipitation (periglacier conditions), and granite outcrops. The reconstruction of the past climate conditions indicated that the temperature in the cold Quaternary glacial age was 13 degrees lower than present, with glacier and periglacier conditions dominating. Under such conditions, the region's granites were extremely weathered, hence producing a large quantity of grain sediments. The surface run-offs or ice tongues drifted these sediments toward Lake Ernan (i.e. the present Ernan playa) and deposited them at its shoreline. After the lake and the main river dried up, southwest winds led the sediments of the lakeshore and the Tang-e-Chenar River upward to the top of the mountains, where sand ramps were, thus, formed. Due to the short formation duration and steady climate, no colluvial, alluvial material, or even soil (despite the large quantity of feldspars in the sand ramps) was traced amid the sediment layers of the sand ramps in the studied region. The only features traced there were slopes, alluvial debris and vegetation, indicating the dominance of warmer and moister climate as compared to the conditions at the time of formation. The directions of the past and developing sand ramps are similar but opposed to the prevailing and secondary wind of the region, indicating that it is the local winds which have formed those ramps. (C) 2019 Elsevier B.V. All rights reserved. |
| 英文关键词 | Sand ramp Periglacier Ernan Shirkouh Mountain Central Iran |
| 类型 | Article |
| 语种 | 英语 |
| 国家 | Iran |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000514254300019 |
| WOS关键词 | AEOLIAN ACTIVITY ; SEDIMENTS ; ARCHITECTURE ; DESERT |
| 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/2XILL650/314609 |
| 作者单位 | Yazd Univ, Dept Geog, Yazd, Iran |
| 推荐引用方式 GB/T 7714 | Paichoon, Mohamad Sharifi. Analysis of the origin, formation and development of sand ramps on the Eastern slopes of Shirkouh, Yazd, Central Iran[J],2020,351. |
| APA | Paichoon, Mohamad Sharifi.(2020).Analysis of the origin, formation and development of sand ramps on the Eastern slopes of Shirkouh, Yazd, Central Iran.GEOMORPHOLOGY,351. |
| MLA | Paichoon, Mohamad Sharifi."Analysis of the origin, formation and development of sand ramps on the Eastern slopes of Shirkouh, Yazd, Central Iran".GEOMORPHOLOGY 351(2020). |
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