Postseafloor Spreading Volcanism in the Central East South China Sea and Its Formation Through an Extremely Thin Oceanic Crust

Zhao Minghui; He Enyuan; Sibuet Jean‐Claude; Sun Longtao; Qiu Xuelin; Tan Pingchuan; Wang Jian

摘要

Abstract > P wave velocity models were obtained by forward and inverse modeling from 38 ocean bottom seismometers deployed in the central East subbasin of the South China Sea (SCS). Four types of crust have been defined: (a) thin oceanic crust (5 km), (b) typical oceanic crust (5–6 km), (c) thick oceanic crust hosting postspreading volcanoes (6 km) with significant intrusive roots, and (d) thick oceanic crust with enhanced spreading features (6 km) but without significant roots. Within the central East subbasin, the thin oceanic crust, only identified inside an 80 km wide zone, is located within an overall 150 km wide domain characterized by N055° seafloor spreading trends. The postspreading volcanoes were formed during a N‐S tensional episode around 6–10 Ma, several millions of years after seafloor spreading ceased in the SCS. Seafloor spreading (N055° and N145°) and postspreading (N000° and N090°) features are observed in the morphology of some of these volcanoes. The rupture of the brittle thin oceanic crust was focused where the crust was the weakest, i.e., at the intersection of the extinct spreading ridge with former fracture zones. From geological and geophysical arguments, we suggest that the postspreading volcanism might have been influenced by the Hainan plume activity through a buoyancy‐driven partial melting mechanism. </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”> <标题类型=“main”>抽象</ title> > p </ i> 从南中国海（SCS）中央东部亚巴西列州部署的38个海洋底部地震仪，通过向前和反向建模获得波速模型。已经定义了四种类型的地壳：（a）薄海外壳（5公里），（b）典型的海洋地壳（5-6 km），（c）厚厚的海洋地壳托管瓶颈火山（＆ 6公里）具有显着的侵扰性根，（d）具有增强的传播特征（＆ 6公里）但没有重大根源的厚海底。在中央东亚比巴内，薄型海底仅在80公里的宽区域内识别，位于整体150公里的宽域内，其特征在于N055°海底蔓延趋势。在SCS中停止的海底展开后，在6-10 mA左右6-10 mA的N-S张集集中形成了后预涂的火山。在一些这些火山的形态中观察到海底散布（N055°和N145°）和后预期（N000°和N090°）特征。脆性薄海外壳的破裂集中在地壳是最弱的，即，在灭绝骨折区域的灭绝蔓延脊的交叉点。从地质和地球物理论争中，我们建议在浮力驱动的部分熔化机制中受到海南羽毛活动的影响。 </ 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3期</span><b style="margin: 0 2px;">|</b><span>共21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=Zhao Minghui&option=202" target="_blank" rel="nofollow">Zhao Minghui;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=He Enyuan&option=202" target="_blank" rel="nofollow">He Enyuan;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Sibuet Jean‐Claude&option=202" target="_blank" rel="nofollow">Sibuet Jean‐Claude;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Sun Longtao&option=202" target="_blank" rel="nofollow">Sun Longtao;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Qiu Xuelin&option=202" target="_blank" rel="nofollow">Qiu Xuelin;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Tan Pingchuan&option=202" target="_blank" rel="nofollow">Tan Pingchuan;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wang Jian&option=202" target="_blank" rel="nofollow">Wang Jian;</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 Ocean and Marginal Sea GeologySouth China Sea Institute of Oceanology Chinese Academy of SciencesGuangzhou China;</p> <p>Key Laboratory of Ocean and Marginal Sea GeologySouth China Sea Institute of Oceanology Chinese Academy of SciencesGuangzhou China;</p> <p>Ifremer Centre de Brest Plouzané 44 rue du CloitreFrance;</p> <p>Key Laboratory of Ocean and Marginal Sea GeologySouth China Sea Institute of Oceanology Chinese Academy of SciencesGuangzhou China;</p> <p>Key Laboratory of Ocean and Marginal Sea GeologySouth China Sea Institute of Oceanology Chinese Academy of SciencesGuangzhou China;</p> <p>Center for Earth Evolution and Dynamics University of OsloOslo Norway;</p> <p>Department of Ocean Science and EngineeringSouth University of Science and Technology of ChinaShenzhen 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=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=wide‐angle seismic reflection and refraction data&option=203" rel="nofollow">wide‐angle seismic reflection and refraction data;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=postseafloor spreading volcanism&option=203" rel="nofollow">postseafloor spreading volcanism;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=extinct spreading ridge&option=203" rel="nofollow">extinct spreading ridge;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hainan plume&option=203" rel="nofollow">Hainan plume;</a> </p> <div class="translation"> 机译：南海;广角地震反射和折射数据;后期蔓延火山;灭绝的蔓延山脊;海南羽流; </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 class="enjiyixqcontent" href="/journal-foreign-detail/0704023360815.html">Postseafloor Spreading Volcanism in the Central East South China Sea and Its Formation Through an Extremely Thin Oceanic Crust</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Zhao Minghui&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Zhao Minghui,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=He Enyuan&option=202" 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