Geochemical and Geochronological Constraints on the Origin and Emplacement of the East Taiwan Ophiolite

Lin Chiou‐Ting; Harris Ron; Sun Wei‐Dong; Zhang Guo‐Liang

摘要

Abstract > The East Taiwan Ophiolite (ETO) occurs as blocks and thrust sheets associated with the Lichi Mélange in the Coastal Range of eastern Taiwan. The blocks consist of serpentinized harzburgite, serpentinite breccia, gabbro, dikes of dolerite and plagiogranite, pillow basalts, and red clay within a mud‐ and serpentinite‐rich mélange matrix. New U‐Pb zircon dating of a pegmatite gabbro yields a weighted mean age of 16.65?±?0.20?Ma. This age is earlier than the North Luzon Arc but overlaps with the late‐stage spreading of the South China Sea. ETO glassy basalt has low K <sub>2</sub> O, MgO and high CaO contents, similar to MORB. REE and trace element patterns show both N‐MORB patterns with LREE depletion and E‐MORB patterns with slight LREE enrichment. A few samples show slight depletion in Nb‐Ta and Ti and enrichment in Rb, Ba, U and Sr, indicating a hint of subduction influence. Most ETO basalt plots within the overlapping fields of N‐MORB and BABB on Ti‐V, Cr‐Y, Nb/Yb‐Th/Yb, and Hf/3‐Th‐Ta discrimination diagrams. These geochemical compositions are emblematic of mid‐ocean ridge or back‐arc lava, like South China Sea basalt. We interpret ETO basalt and gabbro as fragments of the subducted South China Sea basement that were scrapped off and accreted to the Luzon forearc during the process of subduction initiation along the Manila Trench. Blocks of mantle material in the mélange may originate from the upper plate of the arc‐continent collision and were mixed with lower plate crustal material in a subduction channel now represented by the Lichi Mélange. </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> > 东台湾Ophiolite（ETO）作为与台湾沿海范围内的LichiMélange相关的块和推力板。该嵌段由蛇形化的Harzburgite，Serpentinite Breccia，Gabbro，Dikes of Dolerite和Plagiogranite，枕头玄武岩和红粘土内的泥土和蛇形和蛇纹石的Mélange矩阵。新的U-PB锆石的佩格麦特石Gabbro的约会产生16.65岁的加权平均年龄？±0.20？ma。这个年龄早于北吕宋弧，而且与南海的后期蔓延重叠。 Eto玻璃玄武岩k <sub> 2 </ sub> O，MgO和高CAO含量，类似于Morb。 Ree和Trace Element模式显示N-Morb模式，含有lee耗尽和e-morb模式，具有轻微的浓缩浓缩。少数样品显示Nb-Ta和Ti的轻微耗尽，并在RB，Ba，U和Sr中富集，表明俯冲影响。在Ti-V，Cr-y，Nb / Yb-th / Yb和HF / 3-TA鉴别图中N-Morb和Babb的重叠场内的大多数EtO玄武岩图。这些地球化学组合物是海洋山脊或后弧熔岩的象征，如华南海洋玄武岩。我们将Eto玄武岩和GABBRO解释为悬浮的南海地下室的碎片，在沿着马尼拉沟渠的俯冲开始过程中被废除并屈服于Luzon Forearc。 Mélange中的披风材料块可以源自弧形大陆碰撞的上板，并在现在由LichiMélange表示的俯冲通道中与下板块地壳混合。 </ 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4期</span><b style="margin: 0 2px;">|</b><span>共24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=Lin Chiou‐Ting&option=202" target="_blank" rel="nofollow">Lin Chiou‐Ting;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Harris Ron&option=202" target="_blank" rel="nofollow">Harris Ron;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Sun Wei‐Dong&option=202" target="_blank" rel="nofollow">Sun Wei‐Dong;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Zhang Guo‐Liang&option=202" target="_blank" rel="nofollow">Zhang Guo‐Liang;</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>Key Laboratory of Marine Geology and Environment and Center of Deep Sea Research Institute of OceanologyChinese Academy of SciencesQingdao China;</p> <p>Department of GeologyBrigham Young UniversityProvo UT USA;</p> <p>Key Laboratory of Marine Geology and Environment and Center of Deep Sea Research Institute of OceanologyChinese Academy of SciencesQingdao China;</p> <p>Key Laboratory of Marine Geology and Environment and Center of Deep Sea Research Institute of OceanologyChinese Academy of SciencesQingdao China;</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=East Taiwan Ophiolite&option=203" rel="nofollow">East Taiwan Ophiolite;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Lichi Mélange&option=203" rel="nofollow">Lichi Mélange;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=South China Sea&option=203" rel="nofollow">South China Sea;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=back‐arc basin&option=203" rel="nofollow">back‐arc basin;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=subduction initiation&option=203" rel="nofollow">subduction initiation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=arc‐continent collision&option=203" rel="nofollow">arc‐continent collision;</a> </p> <div class="translation"> 机译：东台湾ophiolite;LichiMélange;南海;背弧盆地;俯冲开始;弧形碰撞; 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