Controls on sand ramp formation in southern Namibia

Rowell Alex; Thomas David; Bailey Richard; Stone Abi; Garzanti Eduardo; Padoan Marta

摘要

Abstract >Sand ramps have the potential to provide rich palaeoenvironmental information in dryland regions where proxy records are typically scarce. However, current knowledge of the geomorphic controls and processes of sand ramp formation is limited. This study provides a data‐rich examination of the key factors controlling sand ramp formation. The location and morphology of 75 sand ramps in southern Namibia are examined. The sediments and chronologies of 10 sand ramps are studied in detail using 51 OSL dates and 83 grain‐size and LOI samples. Heavy mineral assemblages are used to determine the provenance of 10 samples and OSL sensitivity is used to explore geomorphic processes of eight samples. >Sand ramp morphology can be grouped into one of four classes of increasing size and complexity and is closely linked to the available accommodation space. Heavy mineral assemblages indicate local sediment sources and all 75 studied sand ramps are within 4?km of a large ephemeral river channel or within 5.5?km of a dune field. Therefore, accommodation space and sediment supply are identified as the primary controls of sand ramp formation. Sedimentology and OSL sensitivity suggest a complex interplay of aeolian, fluvial and colluvial processes contribute to sand ramp formation with large variability observed between ramps. Three of the ten dated sand ramps have been present in the Namibian landscape for 100?ka. Eight sand ramps show episodic deposition between 75–12?ka and five show evidence of surface reworking over the past 2?ka. Environmental sensitivity is probably linked to the size and availability of the accommodation space. Therefore, individual sand ramps are expected to reflect local environmental conditions, recording when an abundant sediment supply coincided with available accommodation space, while a regional analysis of multip </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><abstract xmlns =“http://www.wiley.com/namespaces/wiley”type =“main”> <title type =“main”>抽象</ title> >沙坡道有可能提供富人的环境代理记录通常稀缺的Dryland地区的信息。然而，目前对砂坡形成的地貌控制和过程的知识有限。本研究提供了对控制砂坡道形成的关键因素的数据丰富检查。检查了南纳米比亚75个沙坡的位置和形态。使用51 OSL日期和83个粒度和LOI样品详细研究了10个砂坡道的沉积物和年曲线。重矿物组合用于确定10个样品的出处，使用OSL敏感性来探索八个样品的几何过程。</ p> >砂坡道形态可以分组为增加尺寸和复杂性的四种类中的一个。与可用的住宿空间密切相关。重型矿物组合指示局部沉积物来源，所有75个学习的沙坡道距离大型短暂河道的4千米范围内或5.5千米的沙丘场。因此，住宿空间和沉积物供应被识别为砂坡道形成的主要控制。沉积物和OSL敏感性表明，河流，河流和防尔的过程中的复杂相互作用有助于斜坡之间观察到的砂坡道形成。纳米比亚景观中有三个10个月的沙子坡道中的三个＆ 100？Ka。八个沙坡道展示＆gt之间的情节沉积。75-12？Ka和五个显示过去2的表面重新加工证据？Ka。环境敏感性可能与住宿空间的大小和可用性有关。因此，预计各个砂坡道将反映当地环境条件，在丰富的沉积物供应恰逢可用的住宿空间时录制，而Multip的区域分析 </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-22319/'>《Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group》</a> <b style="margin: 0 2px;">|</b><span>2018年第1期</span><b style="margin: 0 2px;">|</b><span>共22页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Rowell Alex&option=202" target="_blank" rel="nofollow">Rowell Alex;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Thomas David&option=202" target="_blank" rel="nofollow">Thomas David;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Bailey Richard&option=202" target="_blank" rel="nofollow">Bailey Richard;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Stone Abi&option=202" target="_blank" rel="nofollow">Stone Abi;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Garzanti Eduardo&option=202" target="_blank" rel="nofollow">Garzanti Eduardo;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Padoan Marta&option=202" target="_blank" rel="nofollow">Padoan Marta;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>School of Geography and the EnvironmentUniversity of OxfordOxford UK;</p> <p>School of Geography and the EnvironmentUniversity of OxfordOxford UK;</p> <p>School of Geography and the EnvironmentUniversity of OxfordOxford UK;</p> <p>Department of GeographyUniversity of ManchesterManchester UK;</p> <p>Department of Earth and Environmental SciencesUniversità di Milano‐Bicocca20126 Milano Italy;</p> <p>Department of Earth and Environmental SciencesUniversità di Milano‐Bicocca20126 Milano Italy;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p 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