...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Volcanology and Geothermal Research >Evaluation of a small-diameter sampling method in magnetic susceptibility, AMS and X-ray CT studies and its applications to mafic microgranular enclaves (MMEs) in granite
【24h】

Evaluation of a small-diameter sampling method in magnetic susceptibility, AMS and X-ray CT studies and its applications to mafic microgranular enclaves (MMEs) in granite

机译：小直径取样方法在磁化率，AMS和X射线CT研究中的评估及其在花岗岩中镁铁质微颗粒飞地（MME）中的应用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper reviews the technical details of the small diameter sampling method in a study of anisotropy of magnetic susceptibility (AMS) and X-ray CT (computed tomography) and their applications to studies of MMEs (Mafic Microgranular Enclaves) in granite. The AMS results based on 9 mm diameter cylinder specimens collected from the Cretaceous Tongkengxi mafic dykes in South China were consistent with results using 25 mm diameter specimens. The first case study demonstrated the variation of AMS in the interior of a large MME from South China, which contained a center of strong short-range magnetic lineation. This type of magnetic fabric could be detected only by using sample cores with a small diameter. In the foliation direction, the host granite interacted with the MME more heavily and produced a region with a high magnetite content The second case study was the investigation of the MMEs in the Early Cretaceous Muchen complex in eastern South China. The MME swarms exhibited relatively uniform magnetic fabrics at the outcrop scale, but the fabrics varied significantly at the intrusion scale. AMS of the MME swarms is coaxial with that of the host granite only at some localities. The disagreement of AMS between MME and host granite either imply different magma flow directions, or different magma flow velocities, or disturbance of the granite fabric by the MME. The MMEs in a mylonitic granite from eastern North China were also studied. The MME specimens show highly variable magnetic susceptibility and lineations. They can be only studied appropriately by a small drill. In the three cases, the three magnetic susceptibility axes of the MMEs are consistent with the volume-weighted maximum eigenvector of long/intermediate/short axes of magnetite. The orientations of the magnetite long axes in the three cases form several modes and the concentration of the modes results in a strong lineation. One implication of this study is that MMEs, with the same magmatic fabrics as their host granite, most likely represent mafic magmas flowing with granitic magmas. Another implication is that the interaction between MMEs and host granite, which is strengthened by magmatic flows or ductile deformations, may promote crystallization of magnetite and formation of magnetite-rich granitoids. The presented 9 mm sampling methods provides easy ways to study the petrofabrics and other properties of small-sized features such as MMEs and their detailed internal textures. (C) 2017 Elsevier B.V. All rights reserved.
机译：本文概述了小直径采样方法在磁化率（AMS）和X射线CT（计算机断层扫描）各向异性研究中的技术细节，以及它们在花岗岩中MME（Mafic微颗粒飞地）研究中的应用。 AMS结果基于从华南白垩纪铜坑溪基性质岩堤收集的9 mm直径圆柱体标本，与使用25 mm直径标本的结果一致。第一个案例研究证明了华南地区大型MME内部的AMS的变化，该区域包含一个短距离强磁力线中心。这种磁性织物只能通过使用小直径的样品芯来检测。在页岩化方向上，宿主花岗岩与MME的相互作用更加剧烈，并产生了一个磁铁矿含量高的区域。第二个案例研究是对华南东部早白垩世Muchen复合体中MME的研究。 MME群体在露头尺度上展示出相对均匀的磁性织物，但是在入侵尺度上，这些织物变化很大。 MME群的AMS仅在某些位置与主体花岗岩的AMS同轴。 MME与基质花岗岩之间的AMS不一致要么暗示着不同的岩浆流动方向，要么暗示着不同的岩浆流动速度，或者暗示了MME对花岗岩织物的干扰。还研究了来自华北东部的花岗质花岗岩中的MME。 MME样品显示出高度变化的磁化率和谱线。只能用小钻适当地研究它们。在这三种情况下，MME的三个磁化率轴与磁铁矿的长/中/短轴的体积加权最大特征向量一致。在这三种情况下，磁铁矿长轴的取向形成几种模式，这些模式的集中导致强烈的线条。这项研究的一个含义是，具有与它们的宿主花岗岩相同的岩浆纤维的MME，最有可能代表着镁铁质岩浆与花岗岩岩浆一起流动。另一个含义是，MME与主体花岗岩之间的相互作用（通过岩浆流动或延性变形而增强）可以促进磁铁矿的结晶和富磁铁矿花岗岩的形成。提出的9 mm采样方法提供了研究岩石织物和小型特征（如MME）及其详细内部纹理的其他属性的简便方法。 （C）2017 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Journal of Volcanology and Geothermal Research》 |2017年第15期|208-227|共20页
  • 作者

    Zhu Kong-Yang; Li Ming-Yue; Shentu Lu-Feng; Shen Zhong-Yue; Yu Yi-Hao;

  • 作者单位

    Zhejiang Univ, Sch Earth Sci, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Sch Earth Sci, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Sch Earth Sci, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Sch Earth Sci, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Sch Earth Sci, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号