Changing Abundance of Magnetofossil Morphologies in Pelagic Red Clay Around Minamitorishima, Western North Pacific

Usui Yoichi; Yamazaki Toshitsugu; Saitoh Masafumi

摘要

Abstract >Recent investigations have discovered an unexpected abundance of magnetofossils in oxic pelagic red clays. These have potential to serve as paleoenvironmental tracers in otherwise nonfossiliferous sediments. Here, we report on variations in the abundance and morphology of magnetofossils in red clay from the western North Pacific. Magnetic measurements revealed that magnetofossils dominate the magnetic mineral assemblage of the sediments. An endmember analysis of isothermal remanent magnetization acquisition curves, supplemented by an analysis of S ratios, indicates that the magnetic assemblage can be unmixed into three endmembers, two corresponding to magnetofossils and one to terrigenous magnetic minerals. Direct counting of magnetofossil morphologies under a transmission electron microscope shows that the two magnetofossil endmembers differentiate equant magnetofossils and bullet‐shaped magnetofossils, respectively. The stratigraphic variation of the endmember contributions revealed that the equant magnetofossils are dominant for the most part, while an interval at around 7 m in core depth shows higher abundance of the bullet‐shaped magnetofossils. This may reflect enhanced organic carbon flux to the sediments. The organic carbon content is low throughout the sediments, and it does not show any change corresponding to the increase of bullet‐shaped magnetofossils, pointing at extensive remineralization of the organic carbon. On the basis of lithostratigraphic correlation to nearby drilling sites, we tentatively estimate the age of the bullet‐shaped magnetofossil increase as sometime between ～75 and 25 Ma. These results suggest that environmental information can be obtained from magnetofossils in pelagic red clay. </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>最近的调查已经发现了一种氧体胶囊红粘土中的意外丰富的磁料。这些具有潜在的含量不含沉积物的古环境示踪剂。在这里，我们报告了北太平洋西部红粘土的丰富和形态的变化。磁测量揭示了磁料中占据了沉积物的磁性矿物组合。通过分析S比率补充等温剩余磁化采集曲线的一个结局分析，表明磁性组装可以解混成三个终端，与磁致料和一个对抗造成磁性矿物质。在透射电子显微镜下的磁致香料形态的直接计数表明，两个磁料中料终点分别分别分析秤磁致料和子弹形磁致发物料。终点贡献的地层变异揭示了秤磁发品大部分占主导地位，而核心深度约为7米的间隔显示出较高的子弹形磁致料。这可能反映增强的有机碳通量到沉积物。在整个沉积物中，有机碳含量低，并且不显示对应于子弹形磁致磁致的增加的任何变化，指向有机碳的广泛再矿化。根据与附近的钻井场所的岩石脊椎动物相关性，我们暂时估计子弹形磁蒸汽的年龄随时间〜75和25 mA之间的某个时间。这些结果表明环境信息可以从岩化红粘土中的磁致发射。</ 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>2017年第12期</span><b style="margin: 0 2px;">|</b><span>共15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=Usui Yoichi&option=202" target="_blank" rel="nofollow">Usui Yoichi;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Yamazaki Toshitsugu&option=202" target="_blank" rel="nofollow">Yamazaki Toshitsugu;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Saitoh Masafumi&option=202" target="_blank" rel="nofollow">Saitoh Masafumi;</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 Deep Earth Structure and Dynamics ResearchJapan Agency for Marine‐Earth Science and Technology (JAMSTEC)Yokosuka Kanagawa Japan;</p> <p>Research and Development Center for Submarine Resources JAMSTECYokosuka Kanagawa Japan;</p> <p>Research and Development Center for Submarine Resources JAMSTECYokosuka Kanagawa Japan;</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=environmental magnetism&option=203" rel="nofollow">environmental magnetism;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=pelagic red clay&option=203" rel="nofollow">pelagic red clay;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=magnetofossils&option=203" rel="nofollow">magnetofossils;</a> </p> <div class="translation"> 机译：环境磁性;骨质红粘土;磁致发物质; 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