Latitude Dependence of Geomagnetic Paleosecular Variation and its Relation to the Frequency of Magnetic Reversals: Observations From the Cretaceous and Jurassic

Doubrovine Pavel V.; Veikkolainen Toni; Pesonen Lauri J.; Piispa Elisa; Ots Siim; Smirnov Aleksey V.; Kulakov Evgeniy V.; Biggin Andrew J.

摘要

Abstract > Nearly three decades ago paleomagnetists suggested that there existed a clear link between latitude dependence of geomagnetic paleosecular variation (PSV) and reversal frequency. Here we compare the latitude behavior of PSV for the Cretaceous Normal Superchron (CNS, 84–126?Ma, stable normal polarity) and the preceding Early Cretaceous‐Jurassic interval (pre‐CNS, 126–198?Ma, average reversal rate of ~4.6?Myr ?1 ). We find that the CNS was characterized by a strong increase in the angular dispersion of virtual geomagnetic poles (VGPs) with latitude, which is consistent with the results of earlier studies, whereas the VGP dispersion for the pre‐CNS period was nearly invariant with latitude. However, the PSV behavior for the last 5 or 10?million years (average reversal frequency of ~4.4–4.8 Myr ?1 ) shows that the latitude invariance of VGP scatter cannot be considered as a characteristic feature of a frequently reversing field and that a strong increase in VGP dispersion with latitude was not restricted to the long periods of stable polarity. We discuss models describing the latitude dependence of PSV and show that their parameters are not reliable proxies for reversal frequency and should not be used to make inferences about the geomagnetic field stability. During the pre‐CNS interval, the geodynamo may have operated in a regime characterized by a high degree of equatorial symmetry. In contrast, more asymmetric geodynamos suggested for 0–10?Ma and the CNS were evidently capable of producing a very wide range of reversal frequencies. </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> > 近三十年前古磁体表明，地磁古分子变化（PSV）和逆转频率的纬度依赖性之间存在明确的联系。在这里，我们将PSV的纬度行为与白垩纪正常主机（CNS，84-126？MA，稳定的正常极性）和前期的白垩纪 - 侏罗纪间隔（CNS，126-198位，平均逆转率的〜〜 4.6？MYR. ？1 </ sup> ）。我们发现CNS的特征在于，虚拟地磁杆（VGPS）与纬度的角度分散的强烈增加，这与早期研究的结果一致，而预先提前的VGP分散率几乎不变，但纬度几乎不变。但是，过去5或10百万年的PSV行为（平均逆转频率为〜4.4-4.8 myr ？1 </ sup> ）显示VGP散射的纬度不变性不能被认为是频繁反转场的特征，并且与纬度的VGP色散的强大增加不限于稳定极性的长时间。我们讨论描述PSV纬度依赖性的模型，并表明它们的参数是反转频率的可靠性代理，不应用于对地磁场稳定性的推断。在预订前的间隔期间，Geodynamo可能在以特征在于高度赤道对称的状态下操作。相反，更加非对称的Geodynamos适用于0-10？MA和CNS显然能够产生非常广泛的逆转频率。 </ 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>2019年第3期</span><b style="margin: 0 2px;">|</b><span>共40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=Doubrovine Pavel V.&option=202" target="_blank" rel="nofollow">Doubrovine Pavel V.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Veikkolainen Toni&option=202" target="_blank" rel="nofollow">Veikkolainen Toni;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Pesonen Lauri J.&option=202" target="_blank" rel="nofollow">Pesonen Lauri J.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Piispa Elisa&option=202" target="_blank" rel="nofollow">Piispa Elisa;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Ots Siim&option=202" target="_blank" rel="nofollow">Ots Siim;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Smirnov Aleksey V.&option=202" target="_blank" rel="nofollow">Smirnov Aleksey V.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kulakov Evgeniy V.&option=202" target="_blank" rel="nofollow">Kulakov Evgeniy V.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Biggin Andrew J.&option=202" target="_blank" rel="nofollow">Biggin Andrew J.;</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>Centre for Earth Evolution and DynamicsUniversity of OsloNorway;</p> <p>Department of Geosciences and GeographyUniversity of HelsinkiFinland;</p> <p>Physics DepartmentUniversity of HelsinkiFinland;</p> <p>School of Geological Sciences and Engineering Yachay TechIbarra Ecuador;</p> <p>Department of GeologyUniversity of TartuEstonia;</p> <p>Department of Geological and Mining Engineering and SciencesMichigan Technological UniversityHoughton MI USA;</p> <p>Centre for Earth Evolution and DynamicsUniversity of OsloNorway;</p> <p>Department of Earth Ocean and Ecological SciencesUniversity of LiverpoolUK;</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=paleosecular variation&option=203" rel="nofollow">paleosecular variation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=geomagnetic reversal frequency&option=203" rel="nofollow">geomagnetic reversal frequency;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=geodynamo&option=203" rel="nofollow">geodynamo;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=robust statistics&option=203" rel="nofollow">robust statistics;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Cretaceous&option=203" rel="nofollow">Cretaceous;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Jurassic&option=203" rel="nofollow">Jurassic;</a> </p> <div class="translation"> 机译：古分子变异;地磁反转频率;Geodynamo;鲁棒统计;白垩纪;侏罗纪; </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/0704023360823.html">Latitude Dependence of Geomagnetic Paleosecular Variation and its Relation to the Frequency of Magnetic Reversals: Observations From the Cretaceous and Jurassic</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Doubrovine Pavel V.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Doubrovine Pavel 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W.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Handschumacher, D. W.,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Sager, W. W.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Sager, W. W.,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hilde, T. W.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Hilde, T. 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