The Case Against an Early Lunar Dynamo Powered by Core Convection

Evans Alexander J.; Tikoo Sonia M.; Andrews‐Hanna Jeffrey C.

摘要

Abstract >Paleomagnetic analyses of lunar samples indicate that the Moon had a dynamo‐generated magnetic field with ~50?μT surface field intensities between 3.85 and 3.56?Ga followed by a period of much lower (≤?~5?μT) intensities that persisted beyond 2.5?Ga. However, we determine herein that there is insufficient energy associated with core convection—the process commonly recognized to generate long‐lived magnetic fields in planetary bodies—to sustain a lunar dynamo for the duration and intensities indicated. We find that a lunar surface field of ≤1.9?μT could have persisted until 200?Ma, but the ~50?μT paleointensities recorded by lunar samples between 3.85 and 3.56?Ga could not have been sustained by a convective dynamo for more than 28?Myr. Thus, for a continuously operating, convective dynamo to be consistent with the early lunar paleomagnetic record, either an exotic mechanism or unknown energy source must be primarily responsible for the ancient lunar magnetic 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”XML：Lang =“en”> <标题类型=“main”>抽象</ title> >月球样本的古磁体分析表明月亮有一个〜50的发电机产生的磁场？μT表面场强度在3.85和3.56之间的强度，然后持续超过2.5〜GA的强度下降得多（≤α〜5？μT）。然而，我们确定的是，与核心对流相关的能量不足 - 该过程通常认识到在行星体中产生长寿命的磁场 - 以维持月球发电机的持续时间和强度。我们发现≤1.9？μT的月球表面场可能持续到200？ma，但是在3.85和3.56之间的月球样品之间记录的〜50？μT古肾上腺素不能被对流发电机持续超过28个？MYR。因此，对于连续操作，对流发电机与早期的月球古磁性记录一致，无论是异国情调的机制还是未知的能源必须主要负责古老的月球磁场。</ 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-23539/'>《Geophysical Research Letters》</a> <b style="margin: 0 2px;">|</b><span>2018年第1期</span><b style="margin: 0 2px;">|</b><span>共10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=Evans Alexander J.&option=202" target="_blank" rel="nofollow">Evans Alexander J.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Tikoo Sonia M.&option=202" target="_blank" rel="nofollow">Tikoo Sonia M.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Andrews‐Hanna Jeffrey C.&option=202" target="_blank" rel="nofollow">Andrews‐Hanna Jeffrey C.;</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>Lunar and Planetary LaboratoryUniversity of ArizonaTucson AZ USA;</p> <p>Department of Earth and Planetary SciencesRutgers UniversityPiscataway Township NJ USA;</p> <p>Lunar and Planetary LaboratoryUniversity of ArizonaTucson AZ 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=Moon&option=203" rel="nofollow">Moon;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=dynamo&option=203" rel="nofollow">dynamo;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=lunar&option=203" rel="nofollow">lunar;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=magnetic&option=203" rel="nofollow">magnetic;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=convection&option=203" rel="nofollow">convection;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=core&option=203" rel="nofollow">core;</a> </p> <div class="translation"> 机译：月亮;发电机;月球;磁性;对流;核心; 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