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首页> 外文期刊>Geochemistry, geophysics, geosystems >The Role of Variable Slab Dip in Driving Mantle Flow at the Eastern Edge of the Alaskan Subduction Margin: Insights From Shear‐Wave Splitting
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The Role of Variable Slab Dip in Driving Mantle Flow at the Eastern Edge of the Alaskan Subduction Margin: Insights From Shear‐Wave Splitting

机译：可变板坯倾向在阿拉斯加州郊区横向边缘的驾驶地幔流动的作用：剪切波分裂的见解

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Abstract > Alaska provides an ideal tectonic setting for investigating the interaction between subduction and asthenospheric flow. Within the span of a few hundred kilometers along strike, the geometry of the subducting Pacific plate varies significantly and terminates in a sharp edge. Furthermore, the region documents a transition from subduction along the Aleutian Arc to strike‐slip faulting along the Pacific Northwest. To better understand mantle interactions within this subduction zone, we conduct an SKS shear‐wave splitting analysis on passive‐source seismic data collected between 2011 and 2018 at 239 broadband seismometers, including those from the Transportable Array. Anisotropic fast directions in the east of our study area parallel the Queen Charlotte and Fairweather transform faults, suggesting that the ongoing development of lithospheric anisotropy dominates the results there. However, our observed delay times ( <fi>δ</fi> t = 1–1.5 s) obtained across the study region may also imply an asthenospheric contribution to the splitting pattern. Our splitting observations exhibit slab‐parallel fast directions northwest of the trench and a rotation of fast directions around the northeastern slab edge. These observations suggest the presence of toroidal asthenospheric flow around the edge of the downgoing Pacific plate. We suggest that Wrangell Volcanic Field volcanism might be caused by mantle upwelling associated with this flow. Splitting observations closer to the trench can be explained by fossil anisotropy within the downgoing Pacific‐Yakutat plate combined with entrained subslab mantle. The geometry of the slab, including its variable dip and its abrupt eastern edge, thus plays an important role in governing mantle flow beneath Alaska. </abstract> </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 Type =“Main”XML：Lang =“en”XML：ID =“GGGE21881-ABS-ABS-0001”> <标题类型=“main”>抽象</ title> > 阿拉斯加提供了一种理想的构造设置，用于研究俯冲和哮喘流动之间的相互作用。在沿着击球的几百公里的跨度内，底板太平板的几何形状显着变化并终止于尖锐的边缘。此外，该区域记录了沿着阿列丁弧的俯冲的过渡，以沿着太平洋西北地区的滑倒断层。为了更好地了解该俯冲区内的搭桥交互，我们在2011年和2018年间的239宽带地震仪（包括来自可运输阵列）的被动源地震数据进行SKS剪切波分裂分析。我们的研究区东部的各向异性快速方向平行了女王夏洛特和FairWeather转换断层，表明岩石术各向异性的持续发展在那里占据了结果。但是，我们观察到的延迟时间（ <fi>Δ</ fi> 在研究区域中获得的T = 1-1.5秒也可能意味着对分裂图案的抑制贡献。我们的分裂观察展示了沟槽的西北地区的平行快速方向，以及在东北板边缘周围的快速方向的旋转。这些观察结果表明，在追随太平板的边缘周围存在环形哮喘流动。我们建议芝加伦火山场火山主义可能是由与这种流动相关的地幔升值引起的。可以通过追讨的太平洋雅库特板内的化石各向异性结合夹带的亚拉巴壁板来解释接近沟槽的分裂观察。板坯的几何形状，包括其变量倾角及其突然的东部边缘，因此在Alaska下面的地幔流中起着重要作用。 </ p> </摘要> </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-23285/'>《Geochemistry, geophysics, geosystems》</a> <b style="margin: 0 2px;">|</b><span>2019年第5期</span><b style="margin: 0 2px;">|</b><span>共16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=Venereau C. M. A.&option=202" target="_blank" rel="nofollow">Venereau C. M. A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Martin‐Short R.&option=202" target="_blank" rel="nofollow">Martin‐Short R.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Bastow I. D.&option=202" target="_blank" rel="nofollow">Bastow I. D.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Allen R. M.&option=202" target="_blank" rel="nofollow">Allen R. M.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kounoudis R.&option=202" target="_blank" rel="nofollow">Kounoudis R.;</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 Earth Science and EngineeringImperial College LondonLondon UK;</p> <p>Seismological LaboratoryUniversity of CaliforniaBerkeley CA USA;</p> <p>Department of Earth Science and EngineeringImperial College LondonLondon UK;</p> <p>Seismological LaboratoryUniversity of CaliforniaBerkeley CA USA;</p> <p>Department of Earth Science and EngineeringImperial College LondonLondon UK;</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 style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=subduction&option=203" rel="nofollow">subduction;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Alaska&option=203" rel="nofollow">Alaska;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=anisotropy&option=203" rel="nofollow">anisotropy;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=asthenosphere&option=203" rel="nofollow">asthenosphere;</a> </p> <div class="translation"> 机译：俯冲;阿拉斯加;各向异性;哮喘圈; </div> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704023360433.html">The Role of Variable Slab Dip in Driving Mantle Flow at the Eastern Edge of the Alaskan Subduction Margin: Insights From Shear‐Wave Splitting</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Venereau C. 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Pachhai,</a> <span>-1</span> </span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：作者更正：第勒尼安盆地和边缘以下地壳和最上层地幔的3D剪切波速度模型</span> </p> </li> <li> <div> <b>7. </b><a class="enjiyixqcontent" href="/open-access_resources_thesis/01000129545273.html">Mantle flow at the highly arcuate northeast corner of the Lesser Antilles subduction zone: Constraints from shear-wave splitting analyses</a> <b>[O] </b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Michael Hodges&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Michael Hodges,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Meghan S. Miller&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Meghan S. Miller </a> <span>2015</span> </span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：在较小的安妥尔斯郊区俯冲区的高弧东北角的地幔流动：剪切波分裂分析的约束</span> </p> </li> <li> <div> <b>8. </b><a class="enjiyixqcontent" href="/ntis-science-report_nasa_thesis/02071601873.html">Driving forces: Slab subduction and mantle convection</a> <b>[R] </b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hager, Bradford H.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Hager, Bradford H. </a> <span>1988</span> </span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：驱动力：板块俯冲和地幔对流</span> </p> </li> </ul> </div> </div> </div> <div class="theme cardcommon" style="overflow: auto;display:none"> <h3 class="all_title" 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