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Differential Fractionation of Rhyolites During the Course of Crustal Extension, Western Afar (Ethiopian Rift)

机译：西方地壳延伸期间流鼻菌素的差异分馏（埃塞俄比亚裂谷）

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Abstract > We report field observation, age, chemical (major and trace elements), and isotope (Sr‐Nd‐Pb) data for felsic volcanic rocks from Central Afar and adjacent western margin. Investigated volcanic rocks are dominantly rhyolites with minor trachytes, and they are geochemically similar. Their ages range from ~30?Ma (prerift stage), ~20?Ma (early synrift), ~8–4?Ma (main thinning event) to ~2.5–0.1?Ma (late synrift/continental breakup), representing the entire volcanic‐tectonic events that occurred episodically. Major element variations are consistent with fractionation of gabbroic cumulates. Trace element and isotope data preclude an origin by crustal anatexis; the rhyolites are rather genetically linked to the associated basalts and variously contaminated by the crust during differentiation of magmas. Chemical and isotopic data of the rhyolites support an origin by open system differentiation at deep crustal levels (hot wall rock and high r ?=?rate of assimilation/rate of crystallization) and shallow crustal levels (cold wall rock and low r ) with a change in the composition of the assimilated material from lower crustal to upper crustal type. Assimilation appears to decrease in recent times with Quaternary rhyolites, emplaced nearby the active magmatic segments in Afar, which exhibit the isotopic compositions closest to original mantle signature. This is compatible with a crust below the active magmatic segments resulting from important addition of juvenile basic magmas. Such results and interpretations provide actual constrains to suggest that the present‐day stage is probably very close to continental breakup, which will be achieved once the continental crust will be entirely replaced by new magmatic crust. </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> > 从中央远程和相邻的西方边缘报告野生火山岩的现场观察，年龄，化学（主要和痕量元素）和同位素（SR-ND-PB）数据。调查的火山岩是含有次要颅骨细胞的毒细胞，它们是地球化学相似的。他们的年龄范围从〜30？ma（凝球阶段），〜20？ma（早期同步），〜8-4 ma（主要稀疏事件）到〜2.5-0.1？ma（晚期同学/大陆分手），代表整个火山 - 构造事件发生在整理上发生。主要元素变化与Gabbrocoic累积的分馏一致。跟踪元素和同位素数据通过地壳anatexis释放起源;晶状体与相关的玄武岩相当遗传地连接，并在岩浆分化期间被外壳各种污染。籽晶菌素的化学和同位素数据通过在深层地壳水平下开放系统分化来支持起源（热壁岩石和高 R </ I> ？=？同化/结晶速率）和浅地壳水平（冷壁岩石和低 R </ I> ）随着来自下地壳的同化材料的组成变化，对上层地壳型。同化似乎在季耳菌素的近期近期降低，在远处的活性岩石段附近施加，其表现出最接近原始地幔签名的同位素组合物。这与低于活动岩石段下方的地壳兼容，这是由少年基本岩浆的重要添加的。这些结果和解释提供了实际限制，表明本日阶段可能非常接近大陆分手，这将一旦大陆地壳将完全被新的岩白地壳完全取代。 </ 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2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=Ayalew Dereje&option=202" target="_blank" rel="nofollow">Ayalew Dereje;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Pik Rapha?l&option=202" target="_blank" rel="nofollow">Pik Rapha?l;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Bellahsen Nicolas&option=202" target="_blank" rel="nofollow">Bellahsen Nicolas;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=France Lydéric&option=202" target="_blank" rel="nofollow">France Lydéric;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Yirgu Gezahegn&option=202" target="_blank" rel="nofollow">Yirgu Gezahegn;</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>School of Earth SciencesAddis Ababa UniversityAddis Ababa Ethiopia;</p> <p>CRPG UMR 7358 CNRS‐Université de Lorraine 15 rue ND des pauvres BP20Vandoeuvre‐lès‐Nancy Cedex France;</p> <p>Sorbonne Université CNRS Institut des Sciences de la Terre Paris ISTeP UMR 7193Paris France;</p> <p>CRPG UMR 7358 CNRS‐Université de Lorraine 15 rue ND des pauvres BP20Vandoeuvre‐lès‐Nancy Cedex France;</p> <p>School of Earth SciencesAddis Ababa UniversityAddis Ababa Ethiopia;</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=coeval basalt&option=203" rel="nofollow">coeval basalt;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=differential fractionation&option=203" rel="nofollow">differential fractionation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=rhyolite&option=203" rel="nofollow">rhyolite;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=rifting&option=203" rel="nofollow">rifting;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Western Afar&option=203" rel="nofollow">Western Afar;</a> </p> <div class="translation"> 机译：群体玄武岩;差异分馏;流纹岩;渐离;西方; </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 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class="tuijian_auth tuijian_authcolor">,陈斌</a> <span> <a href="/journal-cn-3698/" target="_blank" rel="nofollow" class="tuijian_authcolor"> . 湖北第二师范学院学报 </a> </span> <span> . 2011</span><span>,第003期</span> </span> </div> </li> </ul> <ul style="display: none;"> <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/patent-detail/06130401024633.html">The Wowlongkong uses a negligible fraction of the rotation force of the wheel to generate continuous sound alerting people from afar of a coming bike, completely handsfree for cyclists. It overcomes the ineffective one-off sound of traditional bell which often fails to alert people or makes them panic. Its other advantages include: usefulness in adverse weather, bad lighting, and at blind corners. Its production is environmentally friendly thru uses of recyclable discarded products and has job creation potential, especially for unemployed persons with disability or handicap.</a> <b>[P]</b> . <span> 外国专利：  AU2018236908A1 </span> <span> . 2020-04-09</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：Wowlongkong使用车轮旋转力的很小一部分来产生连续的声音，以警告即将来临的自行车远处的人们，而骑自行车的人则完全免提。它克服了传统铃铛无效的一次性声音，这种声音通常无法提醒人们或引起恐慌。它的其他优点包括：在不利天气，光线不足和盲角的情况下很有用。它的生产通过使用可回收的废弃产品而对环境无害，并且具有创造就业机会的潜力，特别是对于失业的残疾人或残障人士而言。 </span> </p> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" href="/patent-detail/06130415172169.html">Air Jet Device for harvesting fruits, where the channel is connected with the segmented Rift extension in the upper part and the switch on the Bottom, while the button is connected with the Guiding Air Flow at the bottom and expansion On segmented with the fan.</a> <b>[P]</b> . <span> 外国专利：  CL2015000466A1 </span> <span> . 2015-11-06</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：空气收集装置，用于收获水果，该通道的上部与分段的Rift延伸部分相连，底部与开关相连，而按钮的下部与引导气流相连，而风扇则与分段导通相连。 </span> </p> </li> <li> <div> <b>3. </b><a class="enjiyixqcontent" href="/patent-detail/06130424343038.html">METHOD FOR PRODUCING ANTIGENE PREPARATION FROM MYCOBACTERIUM TUBERCULOSIS WITH EXTENDED-SPECTRUM SERUM-POSITIVE FRACTIONS IN WESTERN BLOTTING REACTION</a> <b>[P]</b> . <span> 外国专利：  RU2431675C1 </span> <span> . 2011-10-20</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：蛋白质印迹法从结核分枝杆菌生产抗生素的方法 </span> </p> </li> </ul> </div> </div> </div> <div class="theme cardcommon" style="overflow: auto;display:none"> <h3 class="all_title" id="enpatent55">相关主题</h3> <ul id="subject"> </ul> </div> </div> </div> </div> <div class="right rightcon"> <div class="details_img cardcommon clearfix" style="margin-bottom: 10px;display:none;" > </div> </div> </div> <div id="thesis_get_original1" class="downloadBth" style="bottom: 19px;z-index: 999;" onclick="ywcd('0704023360462','4',7,2,1,'',this,24)" class="delivery" prompt="010401" title="通过人工服务将文献原文发送至邮箱" >获取原文</div> <div class="journalsub-pop-up" style="display: none"> <div class="journal-sub"> <h2>期刊订阅</h2> <img src="https://cdn.zhangqiaokeyan.com/img/loginclose.png" alt="" onclick="$('.journalsub-pop-up').hide()"> <p class="pardon">抱歉，该期刊暂不可订阅，敬请期待！</p> <p class="current">目前支持订阅全部北京大学中文核心（2020）期刊目录。</p> <div style="display: flex;margin-top: 69px;justify-content: space-between;"> <div class="no-sub" onclick="$('.journalsub-pop-up').hide()">暂不订阅</div> <div class="other-sub" onclick="continueSub('from=pc-detail')">继续订阅其他期刊</div> </div> </div> </div> <div class="right_btn"> <ul> 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