The Importance of Upper Mantle Heterogeneity in Generating the Indian Ocean Geoid Low

Ghosh Attreyee; Thyagarajulu G.; Steinberger Bernhard

摘要

Abstract >One of the most pronounced geoid lows on Earth lies in the Indian Ocean just south of the Indian peninsula. Several theories have been proposed to explain this geoid low, most of which invoke past subduction. Some recent studies have also argued that high‐velocity anomalies in the lower mantle coupled with low‐velocity anomalies in the upper mantle are responsible for these negative geoid anomalies. However, there is no general consensus regarding the source of this particular anomaly. We investigate the source of this geoid low by using models of density‐driven mantle convection. Our study is the first to successfully explain the occurrence of this anomaly using a global convection model driven by present‐day density anomalies derived from tomography. We test various tomography models in our flow calculations with different radial and lateral viscosity variations. Some of them produce a fairly high correlation to the global geoid, but only a few (SMEAN2, GyPSuM, SEMUCB, and LLNL‐JPS) could match the precise location and pattern of the geoid low in the Indian Ocean. The source of this low stems from a low‐density anomaly stretching from a depth of 300?km down to ～900?km in the northern Indian Ocean region. This density anomaly potentially originates from material rising along the edge of the African Large Low Shear Velocity Province and moving toward the northeast, facilitated by the movement of the Indian plate in the same direction. </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”XML：ID =“Grl56497-Abs-abs-0001”> <标题类型=“main”>抽象</ title> >最明显的水上大型木薯低点地球位于印度半岛南部的印度洋。已经提出了几个理论解释了这种大溪地低，其中大部分地调查了过去的俯冲。一些最近的研究还认为，下部地幔中的高速异常与上部地幔中的低速异常相结合，负责这些阴性大鼠异常。但是，对该特定异常的来源没有一般性共识。我们通过使用密度驱动的地幔对流模型来研究这种大型木偶低的来源。我们的研究是第一个使用由源自断层扫描的当前密度异常驱动的全球对流模型成功解释这一异常的发生。我们在流程计算中测试各种断层摄影模型，具有不同的径向和侧向粘度变化。其中一些人与全球性大地区产生相当高的相关性，但只有少数（SMEN2，石膏，SEMACB和LLNL-JPS）可以匹配印度洋的精确位置和大地带的图案。这种低茎的源极来自北方印度洋地区北部300厘米的深度延伸到〜900 km。这种密度异常可能源自沿着非洲大型低剪切速度省的边缘升高的材料，并向东北移动，通过印度板在同一方向上的运动促进。</ 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>2017年第19期</span><b style="margin: 0 2px;">|</b><span>共9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=Ghosh Attreyee&option=202" target="_blank" rel="nofollow">Ghosh Attreyee;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Thyagarajulu G.&option=202" target="_blank" rel="nofollow">Thyagarajulu G.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Steinberger Bernhard&option=202" target="_blank" rel="nofollow">Steinberger Bernhard;</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 SciencesIndian Institute of ScienceBangalore India;</p> <p>Centre for Earth SciencesIndian Institute of ScienceBangalore India;</p> <p>Helmholtz Centre PotsdamGFZ German Research Centre for GeosciencesPotsdam Germany;</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=geoid&option=203" rel="nofollow">geoid;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=mantle convection&option=203" rel="nofollow">mantle convection;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=negative geoid anomaly&option=203" rel="nofollow">negative geoid anomaly;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=tomography&option=203" rel="nofollow">tomography;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=LLSVP&option=203" rel="nofollow">LLSVP;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Indian Ocean geoid low&option=203" rel="nofollow">Indian Ocean geoid low;</a> </p> <div class="translation"> 机译：大地带;地幔对流;阴性大鼠异常;断层扫描;LLSVP;印度洋大地带低; 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Jeroen</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Ritsema&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,Ritsema</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=陈华静&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,陈华静</a> <span> <a href="/journal-cn-50502/" target="_blank" rel="nofollow" class="tuijian_authcolor"> . 地震科技情报 </a> </span> <span> . 2001</span><span>,第006期</span> </span> </div> </li> <li> <div> <b>6. </b><a class="enjiyixqcontent" href="/academic-conference-cn_meeting-8826_thesis/020222216845.html">多期熔体提取形成的大洋岩石圈地幔:来自西南印度洋洋中脊深海橄榄岩的证据</a> <b>[C]</b> <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=高长贵&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor"> . 高长贵</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=周怀阳&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,周怀阳</a> <span> <a href="/conference-cn-8826/" target="_blank" rel="nofollow" class="tuijian_authcolor"> . 2012年全国岩石学与地球动力学研讨会 </a> <span> <span> . 2012</span> </span> </div> </li> <li> <div> <b>7. </b><a class="enjiyixqcontent" href="/academic-degree-domestic_mphd_thesis/020314852327.html">西南印度洋中脊橄榄岩元素地球化学及其地幔动力学意义</a> <b>[A] </b> <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=陈灵&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor"> . 陈灵</a> <span> . 2016</span> </span> </div> </li> </ul> <ul style="display: none;"> <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/patent-detail/06120104828489.html">地幔热能水力发电方法</a> <b>[P]</b> . <span> 中国专利： CN1626989A </span> <span> . 2005-06-15</span> </div> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" href="/patent-detail/06120113614297.html">基于重要性度量和低资源迁移学习翻译系统及存储介质</a> <b>[P]</b> . <span> 中国专利： CN113657128A </span> <span> . 2021-11-16</span> </div> </li> <li> <div> <b>3. </b><a class="enjiyixqcontent" href="/patent-detail/06130415173319.html">A Gyratory Crusher Frame part comprises: a mountable on a Upper Mantle, Lower Mantle, the upper mantle an annular Wall extending around a longitudinal Axis of the frame part; a Spider having a Plurality of Arms extending radialm Body out, from a cover positioned on the longitudinal Axis.Each Arm of the Plurality of Arms, a first portion extending generally radially outwards in a direction.</a> <b>[P]</b> . <span> 外国专利：  CL2014002628A1 </span> <span> . 2015-07-10</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：一种回旋破碎机框架部件，包括：可安装在上地幔，下地幔，上地幔，环形壁，其围绕框架部分的纵向轴线延伸;一种具有多个臂的蜘蛛，该多个臂从位于纵轴上的盖径向向外延伸。多个臂的每个臂的第一部分通常沿一个方向径向向外延伸。 </span> </p> </li> <li> <div> <b>4. </b><a class="enjiyixqcontent" href="/patent-detail/06130421290543.html">MID-OCEAN RIDGES IN ATLANTIC AND INDIAN OCEANS, AND CONTINENTAL DRIFT</a> <b>[P]</b> . <span> 外国专利：  JP2013110931A </span> <span> . 2013-06-06</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：大西洋和印度洋中的洋脊和大陆漂移 </span> </p> </li> <li> <div> <b>5. </b><a class="enjiyixqcontent" href="/patent-detail/06130443666077.html">Elastic sleeve for a grab unit, comprises a hollow cylindrical member with an outer mantle surface, an inner mantle surface, and upper and lower end faces</a> <b>[P]</b> . <span> 外国专利：  DE20204539U1 </span> <span> . 2003-09-04</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：用于抓握单元的弹性套筒，包括具有外罩面，内罩面以及上下端面的中空圆柱形构件。 </span> </p> </li> </ul> </div> </div> </div> <div class="theme cardcommon" style="overflow: auto;display:none"> <h3 class="all_title" 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