The Changing Face of the Lithosphere‐Asthenosphere Boundary: Imaging Continental Scale Patterns in Upper Mantle Structure Across the Contiguous U.S. With Sp Converted Waves

Hopper Emily; Fischer Karen M.

摘要

Abstract >Juxtaposed terranes of highly varied tectonic history make up the contiguous U.S.: the tectonically active western U.S., the largely quiescent Archean and Proterozoic cratons of the central U.S., and the Phanerozoic orogen and rifted margin of the eastern U.S. The transitions between these regions are clearly observed with Sp converted wave images of the uppermost mantle. We use common conversion point stacked Sp waves recorded by EarthScope's Transportable Array and other permanent and temporary broadband stations to image the transition from a strong velocity decrease at the lithosphere‐asthenosphere boundary (or LAB) beneath the western U.S. to deeper, less continuous features moving east that largely lie within the lithosphere. Only sparse, localized, weak phases are seen at LAB depths beneath the cratonic interior. Instead, we observe structures within the cratonic lithosphere that are most prominent within the Archean lithosphere of the Superior Craton. The transition from west to east is clearly revealed by cluster analysis, which also shows eastern U.S. mantle velocity gradients as more similar to the western U.S. than the ancient interior, particularly beneath New England and Virginia. In the western U.S., the observed strong LAB indicates a large enough velocity gradient (an average velocity drop of 10?±?4.5% distributed over 30?±?15 km) to imply that melt has ponded beneath the lithosphere. </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”> <标题类型=“main”>抽象</ title> >对高度各种构造历史的并置地弥补了邻近的美国：围绕着美国的强度，美国中部的主要静态古代，以及美国东部的Phanogoicoice orgen和东方的裂缝在这些地区之间的过渡用最上面的地幔的SP转换波图像清楚地观察到。我们使用由EarthScope的可移动阵列和其他永久和临时宽带站记录的公共转换点SP波以图像在美国西方西方岩石圈的岩石圈 - 近距离界面（或实验室）的强速下降到更深，不断的连续功能移动东部大部分位于岩石圈内。在克拉廷内部下方的实验室深度上仅看到稀疏，局部，弱阶段。相反，我们观察克拉特神岩层内的结构，这些岩石圈在上级克拉顿的阿军岩石圈内最为突出。集群分析清楚地揭示了来自西部到东部的过渡，这也显示了东方美国的地幔速度梯度与西美国西方的速度梯度相比。比古老的内饰，特别是新英格兰和弗吉尼亚州。在美国西部，观察到的强大实验室表示足够大的速度梯度（平均速度下降10？±4.5％超过30？ </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>2018年第8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=Hopper Emily&option=202" target="_blank" rel="nofollow">Hopper Emily;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Fischer Karen M.&option=202" target="_blank" rel="nofollow">Fischer Karen M.;</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 Environmental and Planetary SciencesLamont‐Doherty Earth Observatory of Columbia UniversityPalisades NY USA;</p> <p>Department of Earth Environmental and Planetary SciencesBrown UniversityProvidence RI 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 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=lithosphere&option=203" rel="nofollow">lithosphere;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=lithosphere‐asthenosphere boundary&option=203" rel="nofollow">lithosphere‐asthenosphere boundary;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=receiver functions&option=203" rel="nofollow">receiver functions;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=USA&option=203" rel="nofollow">USA;</a> </p> <div class="translation"> 机译：岩石圈;岩石圈 - 哮喘椎间圈边界;接收器功能;美国; 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