Millennial‐Scale Instability in the Geomagnetic Field Prior to the Matuyama‐Brunhes Reversal

Balbas Andrea Marie; Koppers Anthony A. P.; Clark Peter U.; Coe Robert S.; Reilly Brendan T.; Stoner Joseph S.; Konrad Kevin

摘要

Abstract > Changes in the Earth's magnetic field have global significance that reach from the outer core extending out to the uppermost atmosphere. Paleomagnetic records derived from sedimentary and volcanic sequences provide important insights into the geodynamo processes that govern the largest geomagnetic changes (polarity reversals), but dating uncertainties have hindered progress in this understanding. Here, we report a paleomagnetic record from multiple lava flows on Tahiti that bracket the Matuyama‐Brunhes (M‐B) polarity reversal ～771,000 years ago. Our high‐precision 40 Ar/ 39 Ar ages constrain several rapid and short‐lived changes in field orientation up to 33,000 years prior to the M‐B reversal. These changes are similar to ones identified in other less well‐dated lava flows in Maui, Chile, and La Palma that occurred during an extended period of reduced field strength recorded in sediments. We use a simple stochastic model to show that these rapid polarity changes are highly attenuated in sediment records with low sedimentation rates. This prolonged 33,000 year period of reduced field strength and increased geomagnetic instability supports models that show frequent centennial‐to‐millennial‐scale polarity changes in the presence of a strongly weakened dipole field. </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> > 地球磁场的变化具有从外部核心延伸到最上层大气层的全局意义。源自沉积和火山序列的古磁性记录为管理最大的地磁变化（极性逆转）的Geodynamo流程提供了重要的见解，但是约会不确定性在这种理解中阻碍了进展。在这里，我们举报了大溪地上的多个熔岩流的古磁性记录，该古古磁石在塔希提岛托架〜771,000年前逆转的Matuyyama-Brunhes（M-B）极性逆转。我们的高精度 40 </ sup> ar / 39 </ sup> AR AGES在M-B逆转之前约33,000年的现场定向的几个快速和短暂的变化。这些变化与毛伊岛，智利，智利和拉帕尔玛在其他较少日期的熔岩流中识别的变化相似，这在沉积物中记录的降低的场强的延长期间发生。我们使用简单的随机模型来表明这些快速极性变化在沉降率低的沉积物记录中高度衰减。这一延长了33,000年的降低场实力和地磁不稳定性的增加，支持在存在强弱弱化的偶极场的情况下显示频繁百年至千年级极性变化的模型。 </ 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3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=Balbas Andrea Marie&option=202" target="_blank" rel="nofollow">Balbas Andrea Marie;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Koppers Anthony A. P.&option=202" target="_blank" rel="nofollow">Koppers Anthony A. P.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Clark Peter U.&option=202" target="_blank" rel="nofollow">Clark Peter U.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Coe Robert S.&option=202" target="_blank" rel="nofollow">Coe Robert S.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Reilly Brendan T.&option=202" target="_blank" rel="nofollow">Reilly Brendan T.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Stoner Joseph S.&option=202" target="_blank" rel="nofollow">Stoner Joseph S.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Konrad Kevin&option=202" target="_blank" rel="nofollow">Konrad Kevin;</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>College of Earth Ocean and Atmospheric SciencesOregon State UniversityCorvallis OR USA;</p> <p>College of Earth Ocean and Atmospheric SciencesOregon State UniversityCorvallis OR USA;</p> <p>College of Earth Ocean and Atmospheric SciencesOregon State UniversityCorvallis OR USA;</p> <p>Earth and Planetary Science DepartmentUniversity of California–Santa CruzSanta Cruz CA USA;</p> <p>College of Earth Ocean and Atmospheric SciencesOregon State UniversityCorvallis OR USA;</p> <p>College of Earth Ocean and Atmospheric SciencesOregon State UniversityCorvallis OR USA;</p> <p>College of Earth Ocean and Atmospheric SciencesOregon State UniversityCorvallis OR 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=geomagnetic&option=203" rel="nofollow">geomagnetic;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=paleomagnetism&option=203" rel="nofollow">paleomagnetism;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=magnetic reversal&option=203" rel="nofollow">magnetic reversal;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Matuyama‐Brunhes&option=203" rel="nofollow">Matuyama‐Brunhes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=40 Ar/ 39 Ar geochronolgy&option=203" rel="nofollow">40 Ar/ 39 Ar geochronolgy;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Tahiti&option=203" rel="nofollow">Tahiti;</a> </p> <div class="translation"> 机译：金甘油;古元片;磁性逆转;紫杉醇 - 粗纱;40 AR / 39 AR Gochiponolgigh;Tahiti; </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> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704023360794.html">Millennial‐Scale Instability in the Geomagnetic Field Prior to the Matuyama‐Brunhes Reversal</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Balbas Andrea Marie&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Balbas Andrea Marie,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Koppers Anthony A. 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</p> </li> <li> <div> <b>5. </b><a class="enjiyixqcontent" href="/patent-detail/06130424311039.html">Wiper system for wiping windscreen of motor vehicle, has driving device provided with motor, where larger wiping field is covered by wiping between reversal positions than by wiping between reversal position and another reversal position</a> <b>[P]</b> . <span> 外国专利：  DE102009045079A1 </span> <span> . 2011-03-31</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：用于擦拭机动车辆的前挡风玻璃的刮水器系统具有配备有马达的驱动装置，其中，通过在反转位置之间进行擦拭比在反转位置和另一反转位置之间进行擦拭来覆盖更大的擦拭区域。 </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: 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