Earthquakes as Precursors of Ductile Shear Zones in the Dry and Strong Lower Crust

Menegon L.; Pennacchioni G.; Malaspina N.; Harris K.; Wood E.

摘要

Abstract > The rheology and the conditions for viscous flow of the dry granulite facies lower crust are still poorly understood. Viscous shearing in the dry and strong lower crust commonly localizes in pseudotachylyte veins, but the deformation mechanisms responsible for the weakening and viscous shear localization in pseudotachylytes are yet to be explored. We investigated examples of pristine and mylonitized pseudotachylytes in anorthosites from Nusfjord (Lofoten, Norway). Mutual overprinting relationships indicate that pristine and mylonitized pseudotachylytes are coeval and resulted from the cyclical interplay between brittle and viscous deformation. The stable mineral assemblage in the mylonitized pseudotachylytes consists of plagioclase, amphibole, clinopyroxene, quartz, biotite,?±?garnet?±?K‐feldspar. Amphibole‐plagioclase geothermobarometry and thermodynamic modeling indicate that pristine and mylonitized pseudotachylytes formed at 650–750°C and 0.7–0.8 GPa. Thermodynamic modeling indicates that a limited amount of H <sub>2</sub> O infiltration (0.20–0.40 wt. %) was necessary to stabilize the mineral assemblage in the mylonite. Diffusion creep is identified as the main deformation mechanisms in the mylonitized pseudotachylytes based on the lack of crystallographic preferred orientation in plagioclase, the high degree of phase mixing, and the synkinematic nucleation of amphiboles in dilatant sites. Extrapolation of flow laws to natural conditions indicates that mylonitized pseudotachylytes are up to 3 orders of magnitude weaker than anorthosites deforming by dislocation creep, thus highlighting the fundamental role of lower crustal earthquakes as agents of weakening in strong granulites. </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> > 干燥颗粒状面的粘性流的流变学和条件仍然差不多清楚。干燥和强大的地壳中的粘性剪切通常在假辐射静脉中定位，但尚未探索负责弱化和粘性剪切定位的变形机制。我们研究了来自Nusfjord（挪威Lofoten）的Anorthosites中原始和肌霉素的假辐射术的实例。相互叠印的关系表明，原始和肌霉菌化的假辐射术是曲线的，由脆性和粘性变形之间的循环相互作用产生。骨髓化假蝇岩中的稳定矿物组合由Plagioclase，蒙糊糊子，斜曲烯，石英，Biotite，？±garnet？±k-feldspar组成。 Amphibol-Plagioclase地质辐射测定和热力学建模表明，在650-750°C和0.7-0.8GPa下形成的原始和肌霉菌化假咬合。热力学建模表明H有限的H. <sub> 2 </ sub> o渗透（0.20-0.40重量％）是必需的，以稳定髓鞘中的矿物组合。基于普通硅序列的缺乏晶体优选取向，高相混合，相结合的相结合，以及膨胀位点在稀释剂位点中的两倍的三种核酸成核的晶体优选取向，鉴定为肌荧光荧光囊肿中的主要变形机制。流动法向自然条件推断表明，肌霉素的假辐射率高于通过脱位蠕变变形的增强态度越弱3个数量级，从而突出了较低地壳地震的基本作用作为强粒细胞弱化的药剂。 </ 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19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=Menegon L.&option=202" target="_blank" rel="nofollow">Menegon L.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Pennacchioni G.&option=202" target="_blank" rel="nofollow">Pennacchioni G.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Malaspina N.&option=202" target="_blank" rel="nofollow">Malaspina N.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Harris K.&option=202" target="_blank" rel="nofollow">Harris K.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wood E.&option=202" target="_blank" rel="nofollow">Wood E.;</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>School of Geography Earth and Environmental SciencesPlymouth University Drake CircusPlymouth UK;</p> <p>Department of GeosciencesUniversity of PadovaPadova Italy;</p> <p>Department of Earth and Environmental SciencesUniversità degli Studi di Milano BicoccaMilano Italy;</p> <p>School of Geography Earth and Environmental SciencesPlymouth University Drake CircusPlymouth UK;</p> <p>School of Geography Earth and Environmental SciencesPlymouth University Drake CircusPlymouth 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=pseudotachylytes&option=203" rel="nofollow">pseudotachylytes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=shear zones&option=203" rel="nofollow">shear zones;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=lower crustal earthquakes&option=203" rel="nofollow">lower crustal earthquakes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=deformation mechanisms&option=203" rel="nofollow">deformation mechanisms;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=grain‐size sensitive creep&option=203" rel="nofollow">grain‐size sensitive creep;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Lofoten&option=203" rel="nofollow">Lofoten;</a> </p> <div class="translation"> 机译：假震;剪切区;下层地震;变形机制;晶粒大小敏感蠕变;洛凡酮; 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href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=汤懋苍&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,汤懋苍</a> <span> <a href="/journal-cn-5027/" target="_blank" rel="nofollow" class="tuijian_authcolor"> . 地震工程学报 </a> </span> <span> . 2003</span><span>,第002期</span> </span> </div> </li> <li> <div> <b>5. </b><a class="enjiyixqcontent" href="/academic-journal-cn_chinese-journal-geophysics_thesis/0201253037941.html">中国地震科学台阵两期观测资料近场记录揭示的南北地震带地壳剪切波分裂特征</a> <b>[J]</b> <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=张艺&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor"> . 张艺</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=高原&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,高原</a> <span> <a href="/journal-cn-4904/" target="_blank" rel="nofollow" class="tuijian_authcolor"> . 地球物理学报 </a> </span> <span> . 2017</span><span>,第006期</span> </span> </div> </li> <li> <div> <b>6. </b><a class="enjiyixqcontent" href="/academic-conference-cn_meeting-41624_thesis/020222488641.html">板块斜向汇聚区中地壳韧性剪切与穹窿化</a> <b>[C]</b> <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=张波&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor"> . 张波</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=阴从元&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,阴从元</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=张进江&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,张进江</a> <span> <a href="/conference-cn-41624/" target="_blank" rel="nofollow" class="tuijian_authcolor"> . 2016中国地球科学联合学术年会 </a> <span> <span> . -1</span> </span> </div> </li> <li> <div> <b>7. </b><a class="enjiyixqcontent" href="/academic-degree-domestic_mphd_thesis/0203151245.html">地震定位对剪切波分裂的影响分析与张家口-渤海地震带西端地壳介质各向异性</a> <b>[A] </b> <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=赵博&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor"> . 赵博</a> <span> . 2010</span> </span> </div> </li> </ul> <ul style="display: none;"> <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/patent-detail/061201665674.html">在原子层沉积系统中抑制过量前体在单独前体区之间运送</a> <b>[P]</b> . <span> 中国专利： CN102639749B </span> <span> . 2015.06.17</span> </div> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" href="/patent-detail/06120106833812.html">在原子层沉积系统中抑制过量前体在单独前体区之间运送</a> <b>[P]</b> . <span> 中国专利： CN102639749A </span> <span> . 2012-08-15</span> </div> </li> <li> <div> <b>3. </b><a class="enjiyixqcontent" href="/patent-detail/06130403039607.html">METHOD OF DETERMINING FOCAL ZONES OF POTENTIAL EARTHQUAKES IN THE EARTH'S CRUST</a> <b>[P]</b> . <span> 外国专利：  RU2690189C1 </span> <span> . 2019-05-31</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：确定地壳中潜在地震震区的方法 </span> </p> </li> <li> <div> <b>4. </b><a class="enjiyixqcontent" href="/patent-detail/06130477468977.html">Atomic waste stored below earth crust - in layer remote from influence zone of earthquakes</a> <b>[P]</b> . <span> 外国专利：  DE3001348A1 </span> <span> . 1981-07-23</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：储存在地壳下的原子废物-远离地震影响区的层 </span> </p> </li> <li> <div> <b>5. </b><a class="enjiyixqcontent" href="/patent-detail/06130419098499.html">Device for receiving sliding motion of rod of head-rest of vehicle seat, has strip elastically deformed in radial manner, where strip comprises lower zone that gradually widens until lower end to define two side shear zones</a> <b>[P]</b> . <span> 外国专利：  FR2979592A1 </span> <span> . 2013-03-08</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：用于接收汽车座椅头枕杆的滑动的装置，其带材以径向方式弹性变形，其中带材包括下部区域，该下部区域逐渐变宽直至下部端部以限定两个侧向剪切区域 </span> </p> </li> </ul> </div> </div> </div> <div class="theme cardcommon" style="overflow: auto;display:none"> <h3 class="all_title" id="enpatent55">相关主题</h3> <ul id="subject"> </ul> </div> </div> </div> </div> <div class="right rightcon"> <div class="details_img cardcommon clearfix" style="margin-bottom: 10px;display:none;" > </div> </div> </div> <div id="thesis_get_original1" class="downloadBth" style="bottom: 19px;z-index: 999;" onclick="ywcd('0704023360759','4',7,2,1,'',this,24)" class="delivery" prompt="010401" title="通过人工服务将文献原文发送至邮箱" >获取原文</div> <div class="journalsub-pop-up" style="display: none"> <div class="journal-sub"> <h2>期刊订阅</h2> <img src="https://cdn.zhangqiaokeyan.com/img/loginclose.png" alt="关闭" onclick="$('.journalsub-pop-up').hide()"> 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