“Petit Spot” Rejuvenated Volcanism Superimposed on Plume‐Derived Samoan Shield Volcanoes: Evidence From a 645‐m Drill Core From Tutuila Island, American Samoa

Reinhard Andrew A.; Jackson Matthew G.; Blusztajn Jerzy; Koppers Anthony A. P.; Simms Alexander R.; Konter Jasper G.

摘要

Abstract >In 2015 a geothermal exploration well was drilled on the island of Tutuila, American Samoa. The sample suite from the drill core provides 645?m of volcanic stratigraphy from a Samoan volcano, spanning 1.45 million years of volcanic history. In the Tutuila drill core, shield lavas with an EM2 (enriched mantle 2) signature are observed at depth, spanning 1.46 to 1.44?Ma. These are overlain by younger (1.35 to 1.17?Ma) shield lavas with a primordial “common” (focus zone) component interlayered with lavas that sample a depleted mantle component. Following ~1.15?Myr of volcanic quiescence, rejuvenated volcanism initiated at 24.3?ka and samples an EM1 (enriched mantle 1) component. The timing of the initiation of rejuvenated volcanism on Tutuila suggests that rejuvenated volcanism may be tectonically driven, as Samoan hotspot volcanoes approach the northern terminus of the Tonga Trench. This is consistent with a model where the timing of rejuvenated volcanism at Tutuila and at other Samoan volcanoes relates to their distance from the Tonga Trench. Notably, the Samoan rejuvenated lavas have EM1 isotopic compositions distinct from shield lavas that are geochemically similar to “petit spot” lavas erupted outboard of the Japan Trench and late stage lavas erupted at Christmas Island located outboard of the Sunda Trench. Therefore, like the Samoan rejuvenated lavas, petit spot volcanism in general appears to be related to tectonic uplift outboard of subduction zones, and existing geochemical data suggest that petit spots share similar EM1 isotopic signatures. </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> >在2015年，在美国萨摩亚岛的塔图瓦岛岛上钻井井井。来自钻头核心的样品套件从萨摩亚火山的火山地层提供645米，跨越145万年的火山历史。在Tutuila钻芯中，深度观察到具有EM2（富含披风2）签名的盾牌熔岩，跨越1.46至1.44.AMA。这些屏蔽熔岩具有更年轻的（1.35至1.17？ma）盾牌熔岩，其具有原始的“常见的”（聚焦区）组分与熔岩样本夹杂地相同的熔岩。在〜1.15？火山静态的MYR，恢复活力的火山发起，在24.3？Ka上发起并样品EM1（富集的地幔1）组分。在Tutuila上启动恢复活力的火山主义的时机表明，随着萨摩亚热点火山接近汤加沟渠的北端，恢复活力的火山可能是针对性的。这与一个模型一致，其中Tutuila和其他萨摩亚火山的恢复活力的山脉时间与距离汤加沟槽的距离有关。值得注意的是，萨摩亚恢复活力的熔岩使em1同位素组成不同于盾牌熔岩，这些组合物与盾牌熔岩不同，这些组合物与“撒娇斑”伐盾爆发了日本沟槽舷外的舷窗爆发了圣诞岛的舷外爆发了圣诞岛。因此，与萨摩亚恢复活力的熔岩一样，Petit Spot Volcanism通常似乎与构造隆起舷外的俯冲区域相关，并且现有地球化学数据表明Petit Spots共享类似的EM1同位素签名。</ 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23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=Reinhard Andrew A.&option=202" target="_blank" rel="nofollow">Reinhard Andrew A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Jackson Matthew G.&option=202" target="_blank" rel="nofollow">Jackson Matthew G.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Blusztajn Jerzy&option=202" target="_blank" rel="nofollow">Blusztajn Jerzy;</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=Simms Alexander R.&option=202" target="_blank" rel="nofollow">Simms Alexander R.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Konter Jasper G.&option=202" target="_blank" rel="nofollow">Konter Jasper G.;</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 ScienceUniversity of CaliforniaSanta Barbara CA USA;</p> <p>Department of Earth ScienceUniversity of CaliforniaSanta Barbara CA USA;</p> <p>Woods Hole Oceanographic InstitutionWoods Hole MA USA;</p> <p>College of Earth Ocean and Atmospheric SciencesOregon State UniversityCorvallis OR USA;</p> <p>Department of Earth ScienceUniversity of CaliforniaSanta Barbara CA USA;</p> <p>Department of Earth SciencesUniversity of Hawai'i at MānoaHonolulu HI 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=Samoa&option=203" rel="nofollow">Samoa;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=mantle geochemistry&option=203" rel="nofollow">mantle geochemistry;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=petit spot&option=203" rel="nofollow">petit spot;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=EM1&option=203" rel="nofollow">EM1;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=rejuvenated volcanism&option=203" rel="nofollow">rejuvenated volcanism;</a> </p> <div class="translation"> 机译：萨摩亚;地幔地球化学;Petit Spot;EM1;恢复活力的火山主义; </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> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704023360827.html">“Petit Spot” Rejuvenated Volcanism Superimposed on Plume‐Derived Samoan Shield Volcanoes: Evidence From a 645‐m Drill Core From Tutuila 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