The Size and Emergence of Geochemical Heterogeneities in the Hawaiian Mantle Plume Constrained by Sr‐Nd‐Hf Isotopic Variation Over ～47 Million Years

Harrison L. N.; Weis D.

摘要

Abstract > The Hawaiian‐Emperor chain is the ～6,000 km long surface expression of the deeply sourced Hawaiian mantle plume active over the past ～81 Myr. The Hawaiian Islands (～6.5 Ma) present two geographically and geochemically distinct trends, Kea and Loa, while the Emperor Seamounts (81–47 Ma) show only Kea compositions. New Sr‐Nd‐Hf isotope, trace and major element data of 23 Northwest Hawaiian Ridge (～47–6.5 Ma) shield‐stage tholeiitic basalts analyzed in this study fill a critical gap and show both Kea and Loa compositions. A logistic regression model fit to a high‐quality isotopic database of Hawaiian Island basalts is used to predict Loa‐type or Kea‐type affinity of new NWHR isotope analyses. Daikakuji, Mokumanamana, West Nīhoa, Nīhoa, and Middle Bank erupt Loa‐type compositions, a finding corroborated by their geochemical characteristics (e.g., low Th/La, CaO/Al <sub>2</sub> O <sub>3</sub> , and high Sr/Nb, Zr/Nb, SiO <sub>2</sub> ). Participation of the Loa composition gradually increases toward the Hawaiian Islands with time and there is no evidence for the presence of the Lō‘ihi component along the NWHR or before ～1 Myr. A new Hf‐Nd Hawaiian array is calculated based on an up‐to‐date extended Hawaiian Island basalt database ( n ?=?403). The NWHR array is slightly steeper than the Hawaiian array, suggesting minimal participation of the high Hf isotopic source component present in Hawaiian Island volcanoes before ～6.5 Ma. This study fills a significant geochemical data gap in the Hawaiian‐Emperor seamount chain, and shows that Hawaiian plume chemistry evolves significantly with time as the plume samples different deep mantle reservoirs. </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> > 夏威夷皇帝链是〜6,000公里的长表面表达，深受夏威夷地幔羽流过于过去的〜81 MYR。夏威夷群岛（＆ 6.5 ma）在地理上和地球化学上呈现两个趋势，kea和loa，而皇帝海山（＆ 81-47 ma）仅显示KEA组合物。新的SR-ND-HF同位素，追踪和主要元素数据为23个西北夏威夷山脊（〜47-6.5 mA）在本研究中分析的盾牌阶段烟库填补了临界间隙并显示KEA和LOA组合物。符合夏威夷岛屿基础高品质同位素数据库的逻辑回归模型用于预测新的NWHR同位素分析的LOA型或KEA型亲和力。 Daikakuji，Mokumanamana，Westnūhoa，nīhoa和中间银行爆发了遗传型组合物，由其地球化学特征进行了证实（例如，低/洛杉矶，Cao / Al <sub> 2 </ sub> O. <sub> 3 </ sub> ，高Sr / Nb，Zr / Nb，SiO <sub> 2 </ sub> ）。 LOA组成的参与随着时间的推移逐渐增加夏威夷群岛，并且没有证据表明Lō'ihi组分沿NWHR或〜1 MYR之前存在。新的HF-ND夏威夷阵列是基于最新的扩展夏威夷岛玄武岩数据库（ n </ i> ？=？403）。 NWWR阵列比夏威夷阵列略陡，表明高HF同位素源部件在夏威夷岛火山前的最小参与在〜6.5 mA之前。这项研究填补了夏威夷 - 皇帝海山链中的显着地球化学数据差距，并表明夏威夷羽流化学随着羽毛样品不同的深层地幔水库而显着发展。 </ 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8期</span><b style="margin: 0 2px;">|</b> <span>共20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=Harrison L. N.&option=202" target="_blank" rel="nofollow">Harrison L. N.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Weis D.&option=202" target="_blank" rel="nofollow">Weis D.;</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>Department of Earth Ocean and Atmospheric SciencesUniversity of British ColumbiaVancouver BC Canada;</p> <p>Department of Earth Ocean and Atmospheric SciencesUniversity of British ColumbiaVancouver BC Canada;</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=Hawaii&option=203" rel="nofollow">Hawaii;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hawaiian array&option=203" rel="nofollow">Hawaiian array;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=mantle components&option=203" rel="nofollow">mantle components;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=radiogenic isotopes&option=203" rel="nofollow">radiogenic isotopes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=logistic regression&option=203" rel="nofollow">logistic regression;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Northwest Hawaiian Ridge&option=203" rel="nofollow">Northwest Hawaiian Ridge;</a> </p> <div class="translation"> 机译：夏威夷;夏威夷阵列;地幔组分;辐射同位素;物流回归;西北夏威夷山脊; </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> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704023360340.html">The Size and Emergence of Geochemical Heterogeneities in the Hawaiian Mantle Plume Constrained by Sr‐Nd‐Hf Isotopic Variation Over ～47 Million Years</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Harrison L. 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