Late Pleistocene talus flatiron formation below the Coal Cliffs cuesta, Utah, USA

Sheehan Christopher E.; Ward Dylan J.

摘要

Abstract > Cuesta escarpment retreat is a principal mode of exhumation in regions of layered sedimentary rock. On the Colorado Plateau, this process acts as a mechanism for maintaining high‐relief topography and facilitating drainage divide migration. Quantitative estimates of cuesta evolution are difficult to evaluate over glacial‐interglacial timescales, and thus rates of geomorphic change along individual escarpments have mostly been constrained over millions of years. Several studies have addressed this problem by dating colluvium‐mantled talus flatirons. However, this technique has not been applied systematically on the Colorado Plateau. This study quantifies geomorphic change along a single Colorado Plateau cuesta using 36 Cl surface exposure dating. We present 33 ages from a single generation of talus flatirons below the Coal Cliffs of central Utah. Landscape evolution is further constrained using 14 ages from in‐situ bedrock, 3 ages from boulders on gully interfluves, and two ages from terrace alluvium. Results suggest a colluvial apron was deposited below the cuesta beginning as early as Marine Isotope Stage 3, and the latest depositional phase occurred near the Last Glacial Maximum. A switch from apron deposition to incision initiated flatiron formation sometime between 19.7 ± 2.5 and 11.8 ± 1.6 ka, broadly coincident with the transition from glacial to interglacial conditions. Our results have several important implications. Climatic changes during the end of the last glacial period appear to have shifted the balance between deposition and erosion below the Coal Cliffs, emptying the sediment reservoir at their base and increasing their height via bedrock incision. The climatic forcing could be imparted by several mechanisms, including local controls on debris generation / mobilization and </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”xml：lang =“en”> <title type =“main”>抽象</ title> > Cuesta脱悬撤退是分层沉积岩地区挖出的主要模式。在科罗拉多高原上，该过程充当维持高浮雕形貌和促进排水迁移的机制。 Cuesta演化的定量估计难以评估冰川层间时间尺度，因此沿着个体悬崖的几何变化率主要受到数百万的限制。几项研究通过约会Colluvium-Mantled Talus Flatirons解决了这个问题。但是，这种技术尚未在科罗拉多高原上系统地应用。本研究使用 36 </ sup> Cl表面暴露约会来定量沿着单一的Colorado高原Cuesta沿着单体变化。我们从一代犹他州煤炭悬崖下面的一代Talus Flatirons提供了33岁。景观进化进一步限制使用14岁以上的沟壑，从沟壑区的巨石3年代，以及露天露台的两年代。结果表明，早在海洋同位素第3阶段3开始沉积癌症围裙，最新的沉积相位发生在最后的冰川最大值附近。从围裙沉积到切口的切换，在19.7±2.5和11.8±1.6±1.6 ka之间的某个时间开始，随着从冰川到中间夹裂条件的过渡而广泛重合。我们的结果有几个重要的含义。在最后一次冰川期结束时的气候变化似乎已经转移了煤悬崖下方的沉积和侵蚀之间的平衡，将沉积物储存器排空，通过基岩切口增加了高度。气候强制可以通过若干机制赋予，包括垃圾产生/动员的局部控制 </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9期</span><b style="margin: 0 2px;">|</b><span>共20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=Sheehan Christopher E.&option=202" target="_blank" rel="nofollow">Sheehan Christopher E.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Ward Dylan J.&option=202" target="_blank" rel="nofollow">Ward Dylan J.;</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>Department of GeologyUniversity of Cincinnati2600 Clifton Ave Cincinnati OH 45220 USA;</p> <p>Department of GeologyUniversity of Cincinnati2600 Clifton Ave Cincinnati OH 45220 USA;</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 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