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羌北地块上志留统龙木措上组岩石磁学特征

王保锋 程鑫 姜南 卫弼天 张伟杰 吴珂 许鹏祥 周亚楠 刘雨纯 吴汉宁

王保锋, 程鑫, 姜南, 卫弼天, 张伟杰, 吴珂, 许鹏祥, 周亚楠, 刘雨纯, 吴汉宁. 羌北地块上志留统龙木措上组岩石磁学特征[J]. 地质科技通报, 2023, 42(6): 310-318. doi: 10.19509/j.cnki.dzkq.tb20220102
引用本文: 王保锋, 程鑫, 姜南, 卫弼天, 张伟杰, 吴珂, 许鹏祥, 周亚楠, 刘雨纯, 吴汉宁. 羌北地块上志留统龙木措上组岩石磁学特征[J]. 地质科技通报, 2023, 42(6): 310-318. doi: 10.19509/j.cnki.dzkq.tb20220102
Wang Baofeng, Chen Xin, Jiang Nan, Wei Bitian, Zhang Weijie, Wu Ke, Xu Pengxiang, Zhou Yanan, Liu Yuchun, Wu Hanning. Rock magnetic properties of the Upper Silurian Longmu Co Upper Formation in the North Qiangtang Terrane[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 310-318. doi: 10.19509/j.cnki.dzkq.tb20220102
Citation: Wang Baofeng, Chen Xin, Jiang Nan, Wei Bitian, Zhang Weijie, Wu Ke, Xu Pengxiang, Zhou Yanan, Liu Yuchun, Wu Hanning. Rock magnetic properties of the Upper Silurian Longmu Co Upper Formation in the North Qiangtang Terrane[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 310-318. doi: 10.19509/j.cnki.dzkq.tb20220102

羌北地块上志留统龙木措上组岩石磁学特征

doi: 10.19509/j.cnki.dzkq.tb20220102
基金项目: 

国家自然科学基金项目 41774073

国家自然科学基金项目 91855211

国家自然科学基金项目 42074075

第二次青藏高原综合科学考察研究 2019QZKK0704

详细信息
    作者简介:

    王保锋(1997—), 男, 现正攻读地球探测与信息技术专业硕士学位, 主要从事古地磁学研究工作。E-mail: 614975769@qq.com

    通讯作者:

    程鑫(1982—), 男, 教授, 主要从事古地磁学与区域大地构造的教学与科研工作。E-mail: chenxin@nwu.edu.cn

  • 中图分类号: P318.41;P534.43

Rock magnetic properties of the Upper Silurian Longmu Co Upper Formation in the North Qiangtang Terrane

  • 摘要:

    开展羌北地块早古生代古地磁学研究, 定量约束出其古生代以来的古地理位置, 可为研究青藏高原古构造格局、显生宙特提斯演化和古地理重建等提供重要基础和关键制约。在进行古地磁研究之前, 首先进行岩石磁学特征的研究, 明确岩石中载磁矿物的组合类型和特征, 为后续退磁实验方案的选择以及剩磁的原生性的讨论提供岩石磁学基础。对羌北地块上志留统龙木措上组灰岩和砂岩进行岩石磁学特征研究, 包括等温剩磁获得曲线、磁化率随温度变化(χ-T)曲线、三轴等温系统热退磁实验、低温磁学性质测试以及扫描电镜(SEM)和能谱分析(EDS)等。实验结果表明, 龙木措上组灰岩样品中的磁性矿物以磁铁矿为主, 另外还有少量的磁赤铁矿和磁黄铁矿, 砂岩样品中的磁性矿物较为复杂, 主要为磁铁矿, 可能还含有磁黄铁矿等其他磁性矿物。研究结果表明龙木措上组地层中灰岩样品可以分离出稳定的高温剩磁分量, 适宜开展进一步古地磁学研究。

     

  • 图 1  羌北地块及邻区大地构造简图(a)和采样区地质简图(b)

    Figure 1.  Simplified tectonic map of the North Qiangtang Terrane and adjacent areas (a) and simplified geological map of the sampling area (b)

    图 2  龙木措上组地层柱状图和野外露头照片

    Figure 2.  Stratigraphic column and field outcrop photographs of the Longmu Co Upper Formation

    图 3  龙木措上组灰岩(a~f)和砂岩(g~l)样品等温剩磁及反向场退磁曲线、累计高斯模型获得曲线

    Figure 3.  Acquisition curves of isothermal remanent magnetization(IRM), back-field demagnetization curves of IRM and cumulative log Gaussian analysis curves for the limestone(a-f) and sandstone(g-l) samples from the Longmu Co Upper Formation

    图 4  龙木措上组灰岩(a~d)和砂岩(e, f)样品三轴等温剩磁系统热退磁曲线

    Figure 4.  Thermal demagnetization of three-axis IRM for limestone(a-d) and sandstone(e, f) samples from the Longmu Co Upper Formation

    图 5  龙木措上组灰岩(a~d)和砂岩(e, f)样品磁化率随温度变化(χ-T)曲线

    Figure 5.  χ-T curves for limestone(a-d) and sandstone(e, f) samples from the Longmu Co Upper Formation

    图 6  龙木措上组灰岩样品扫描电镜与能谱分析图

    Figure 6.  Scanning electron microscope images and energy dispersive spectra of the limestone samples from the Longmu Co Upper Formation

    图 7  灰岩样品的ZFC和FC磁化强度随温度变化曲线

    Figure 7.  Field-cooled (FC) and zero-field-cooled (ZFC) heating curves of RTSIRM of limestone samples from the Longmu Co Upper Formation

    图 8  龙木措上组灰岩(a, b)和砂岩(c, d)样品退磁结果

    NRM为天然剩磁强度;实心、空心点分别代表正、负半球的投影

    Figure 8.  Demagnetization result for limestone(a, b) and sandstone(c, d) samples from the Longmu Co Upper Formation

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  • 收稿日期:  2022-03-11
  • 录用日期:  2022-06-17
  • 修回日期:  2022-05-26

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