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古地磁学在矿床研究中的应用

黄玺 郑义 陈炳辉 王成明 虞鹏鹏

黄玺, 郑义, 陈炳辉, 等, 2019. 古地磁学在矿床研究中的应用. 地质力学学报, 25 (S1): 5-9. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.002
引用本文: 黄玺, 郑义, 陈炳辉, 等, 2019. 古地磁学在矿床研究中的应用. 地质力学学报, 25 (S1): 5-9. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.002
HUANG Xi, ZHENG Yi, CHEN Binghui, et al., 2019. APPLICATION OF PALEOMAGNETISM IN ORE DEPOSIT STUDY. Journal of Geomechanics, 25 (S1): 5-9. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.002
Citation: HUANG Xi, ZHENG Yi, CHEN Binghui, et al., 2019. APPLICATION OF PALEOMAGNETISM IN ORE DEPOSIT STUDY. Journal of Geomechanics, 25 (S1): 5-9. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.002

古地磁学在矿床研究中的应用

doi: 10.12090/j.issn.1006-6616.2019.25.S1.002
基金项目: 

广东省自然科学基金杰出青年基金 2018B030306021

详细信息
    作者简介:

    黄玺(1996-), 男, 在读硕士, 地球化学专业。E-mail:huangx276@mail2.sysu.edu.cn

    通讯作者:

    郑义(1984-), 男, 博士, 副教授, 矿床学。E-mail:zhengy43@mail.sysu.edu.cn

  • 中图分类号: P318.44

APPLICATION OF PALEOMAGNETISM IN ORE DEPOSIT STUDY

  • 摘要: 古地磁学是研究地质历史上地球磁场强度及其变化的一门学科,其核心是岩石中富含若干的磁性矿物。通过测定其保存的剩磁强度和方向等,可计算获得岩石形成时的初始磁性强度和方向,从而为约束岩石形成时的古磁极位置、形成时代和地球动力学背景等研究提供证据。矿石作为地球演化过程中形成的一类特殊的岩石,对其进行古地磁研究可为矿床的"源—运—储—保—变"等过程提供强有力的证据。现有关于矿床古地磁学的研究主要集中在两方面,一是通过矿物的退磁参数限定其形成时的磁化年龄(矿床定年),二是通过磁组构信息获取矿床形成后的构造应力场变化(矿床保存变化)。需要指出的是,矿床古地磁学的研究一定要立足于地质事实。由于地质产状和围岩蚀变对磁性参数的影响极大,在进行矿床地磁数据处理时一定要慎重,并与磁性地层学互相印证,才有可能获得有价值的磁性参数,从而为约束矿床成因提供有效证据。

     

  • 图  1  劳伦大陆到欧洲晚古生代部分视极移路径图(APWP)(据文献[7])

    Figure  1.  Partial apparent polar wander path(APWP) of late Paleozoic from Laurentia to Europe(Figure from [7])

    图  2  Cloud矿区矿石退磁曲线(据文献[9])

    Figure  2.  Orthogonal vector plots for the remanence of example specimens on alternating field step demagnetization and thermal step demagnetization (after [9])

    表  1  区域平均特征剩余磁化强度

    Table  1.   Group mean characteristic remanent magnetization (ChRM) directions

    采样位置 采样点 特征剩磁方向平均值
    数量 磁偏角/(°) 磁倾角/(°) α95 k Note1
    Black Cloud矿区 8-10 3 173.1 -56.8 16.2 58.7 u, R
    3 185.2 -57.9 16.2 58.7 c, R
    Pando斑岩接触带 11, 12, 26 3 309.4 51.5 13.1 89.5 u, M
    3 326.2 65.6 17.0 53.8 c, M
    大陆主要矿区 1, 2, 4, 5 4 340.0 68.9 15.3 37.0 u, N
    4 335.5 73.6 27.5 12.1 c, N
    注:Note1未校正(u)或校正(c)的顺层倾斜,正常极性(N),反向极性(R),极性混乱(M),数字为采样点
    下载: 导出CSV

    表  2  各矿区古地磁极位置

    Table  2.   Pole positions

    采样位置 采样点 经度E/(°) 纬度N/(°) dp/(°) dm/(°)
    Black Cloud矿区 1 147.4 84.3 17.1 23.5
    大陆主要矿区 5 214.0 71.0 22.0 26.0
    第三纪(所有位置) 11 190.6 78.7 10.2 13.1
    下载: 导出CSV
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  • 刊出日期:  2019-05-01

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