Crystallographic Preferred Orientation of Olivine in Sheared Partially Molten Rocks: The Source of the “a‐c Switch”

Qi Chao; Hansen Lars N.; Wallis David; Holtzman Benjamin K.; Kohlstedt David L.

摘要

Abstract > To investigate the mechanism that produces the crystallographic preferred orientations (CPO) characteristic of sheared partially molten rocks of mantle composition, we analyzed the microstructures of samples of olivine plus 7% basaltic melt deformed in torsion to shear strains as large as <mat:math display="inline" altimg="urn:x-wiley:15252027:media:ggge21493:ggge21493-math-0001" wiley:location="equation/ggge21493-math-0001.png"> <mat:mrow> <mat:mi>γ</mat:mi> <mat:mo>=</mat:mo> </mat:mrow> </mat:math> 13.3. Electron backscattered diffraction (EBSD) observations reveal a CPO characterized by a weak a‐c girdle in the shear plane that develops by <mat:math display="inline" altimg="urn:x-wiley:15252027:media:ggge21493:ggge21493-math-0002" wiley:location="equation/ggge21493-math-0002.png"> <mat:mrow> <mat:mi>γ</mat:mi> <mat:mo>≈</mat:mo> </mat:mrow> </mat:math> 4. This CPO, which exhibits a slightly stronger alignment of [001] than [100] axes in the shear direction, changes little in both strength and distribution with increasing stress and with increasing strain. Furthermore, it is significantly weaker than the CPO observed for dry, melt‐free olivine aggregates. Orientation maps correlated with grain shape measurements from tangential, radial, and transverse sections indicate that olivine grains are longer along [001] axes than along [100] axes and shortest along [010] axes. This morphology is similar to that of olivine grains in a mafic melt. We conclude that the weak a‐c girdle observed in sheared partially molten rocks reflects contributions from two processes. Due to their shape‐preferred orientation (SPO), grains rotate to align their [001] axes parallel to the flow direction. At the same time, dislocation glide on the (010)[100] slip system rotates [100] axes into the flow direction. The presence of this CPO in partially molten regions of the upper mantle significantly impacts the interpretation of seismic anisotropy and kinematics of 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> > 为了研究产生碎屑组合物的剪切部分熔融岩石的结晶优选取向（CPO）的机制，我们分析了橄榄石样品的微观结构加7％玄武岩熔体变形，以抗腐蚀抗剪切菌株 <mat：数学显示=“内联”Altimg =“URN：X-Wiley：15252027：媒体：GGGE21493：GGGE21493-Math-0001”Wiley：Location =“等式/ GGGE21493-Math-0001.png”> <MAT：MROW> <MAT：MI>γ</ MAT：MI> <mat：mo> = </ mat：mo> </ mat：MROW> </ mat：math> 13.3。电子反向散射衍射（EBSD）观察结果揭示了一种CPO，其特征在于由开发的剪切平面中的弱A-C腰带 <mat：数学显示=“内联”Altimg =“URN：X-Wiley：15252027：媒体：GGGE21493：GGGE21493-Math-0002”Wiley：Location =“等式/ GGGE21493-Math-0002.png”> <MAT：MROW> <MAT：MI>γ</ MAT：MI> <MAT：MO>≈</ MAT：MO> </ mat：MROW> </ mat：math> 4.该CPO，其呈剪切方向上的[100]轴略微较强对准，在强度和分布中，随着应力和增加的应变而变化。此外，它显着弱于对无熔融的橄榄石聚集体观察到的CPO。取向图与切向，径向和横向切片的晶粒形状测量相关，表明橄榄石颗粒沿着沿[100]轴沿轴延长，并且沿着轴最短。这种形态类似于MAFIC熔体中的橄榄石颗粒类似。我们得出结论，在剪切部分熔岩中观察到的弱A-C腰带反映了两种过程的贡献。由于它们的形状优选的取向（Spo），晶粒旋转以对准它们平行于流动方向的轴。同时，（010）[100]滑动系统上的位错滑动旋转[100]轴进入流动方向。该CPO在上部露地的部分熔融区域中的存在显着影响了地震各向异性和流动运动学的解释。 </ 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>2018年第2期</span><b style="margin: 0 2px;">|</b><span>共21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=Qi Chao&option=202" target="_blank" rel="nofollow">Qi Chao;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hansen Lars N.&option=202" target="_blank" rel="nofollow">Hansen Lars N.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wallis David&option=202" target="_blank" rel="nofollow">Wallis David;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Holtzman Benjamin K.&option=202" target="_blank" rel="nofollow">Holtzman Benjamin K.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kohlstedt David L.&option=202" target="_blank" rel="nofollow">Kohlstedt David L.;</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 MinnesotaMinneapolis MN USA;</p> <p>Department of Earth SciencesUniversity of OxfordOxford UK;</p> <p>Department of Earth SciencesUniversity of OxfordOxford UK;</p> <p>Lamont Doherty Earth ObservatoryColumbia UniversityPalisades NY USA;</p> <p>Department of Earth SciencesUniversity of MinnesotaMinneapolis MN 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=partial melt&option=203" rel="nofollow">partial melt;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=olivine&option=203" rel="nofollow">olivine;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=CPO&option=203" rel="nofollow">CPO;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=SPO&option=203" rel="nofollow">SPO;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seismic anisotropy&option=203" rel="nofollow">seismic anisotropy;</a> </p> <div class="translation"> 机译：部分熔体;橄榄石;CPO;SPO;地震各向异性; 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