Magmatic Focusing to Mid‐Ocean Ridges: The Role of Grain‐Size Variability and Non‐Newtonian Viscosity

Turner Andrew J.; Katz Richard F.; Behn Mark D.; Keller Tobias

摘要

Abstract >Melting beneath mid‐ocean ridges occurs over a region that is much broader than the zone of magmatic emplacement that forms the oceanic crust. Magma is focused into this zone by lateral transport. This focusing has typically been explained by dynamic pressure gradients associated with corner flow, or by a sublithospheric channel sloping upward toward the ridge axis. Here we discuss a novel mechanism for magmatic focusing: lateral transport driven by gradients in compaction pressure within the asthenosphere. These gradients arise from the covariation of melting rate and compaction viscosity. The compaction viscosity, in previous models, was given as a function of melt fraction and temperature. In contrast, we show that the viscosity variations relevant to melt focusing arise from grain‐size variability and non‐Newtonian creep. The asthenospheric distribution of melt fraction predicted by our models provides an improved explanation of the electrical resistivity structure beneath one location on the East Pacific Rise. More generally, we find that although grain‐size and non‐Newtonian viscosity are properties of the solid phase, their effect on melt transport beneath mid‐ocean ridges is more profound than their effect on the mantle corner flow. </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”> <标题类型=“main”>抽象</ title> >在中海底熔化发生在比形成海洋外壳的岩石施加区域更宽的区域上。岩浆通过横向运输重点放入了这个区域。该聚焦通常通过与角流相关的动态压力梯度来解释，或者由朝向脊轴向上倾斜的辅助镜头通道。在这里，我们讨论了岩浆聚焦的新机制：由近腔内压实压力的梯度驱动的横向运输。这些梯度出现在熔融率和压实粘度的协变量中。以先前模型的压实粘度作为熔体分数和温度的函数给出。相比之下，我们表明，与熔化聚焦相关的粘度变化来自晶粒尺寸变异性和非牛顿蠕变。我们模型预测的熔体部分的哮喘分布在东太平洋上升的一个位置下的电阻率结构的改进说明提供了改进的解释。更一般地，我们发现，尽管粒度和非牛顿粘度是固相的性质，但它们对中海脊下面的熔体运输的影响比它们对与地幔角流的影响更深。</ 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>2017年第12期</span><b style="margin: 0 2px;">|</b><span>共14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=Turner Andrew J.&option=202" target="_blank" rel="nofollow">Turner Andrew J.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Katz Richard F.&option=202" target="_blank" rel="nofollow">Katz Richard F.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Behn Mark D.&option=202" target="_blank" rel="nofollow">Behn Mark D.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Keller Tobias&option=202" target="_blank" rel="nofollow">Keller Tobias;</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 SciencesUniversity of OxfordOxford UK;</p> <p>Department of Earth SciencesUniversity of OxfordOxford UK;</p> <p>Department of Geology and GeophysicsWoods Hole Oceanographic InstitutionWoods Hole MA USA;</p> <p>Department of GeophysicsStanford UniversityStanford CA 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=mid‐ocean ridge&option=203" rel="nofollow">mid‐ocean ridge;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=magma&option=203" rel="nofollow">magma;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=dynamics&option=203" rel="nofollow">dynamics;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=focusing&option=203" rel="nofollow">focusing;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=non‐Newtonian&option=203" rel="nofollow">non‐Newtonian;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=magnetotellurics&option=203" rel="nofollow">magnetotellurics;</a> </p> <div class="translation"> 机译：中海岭;岩浆;动态;聚焦;非牛顿;MarageCellurics; 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