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白龙江中游凤安山滑坡26Al暴露年代研究

舒杰 白世彪 崔豫 陈倩 张志刚 王建

舒杰, 白世彪, 崔豫, 等, 2017. 白龙江中游凤安山滑坡26Al暴露年代研究. 地质力学学报, 23 (6): 914-922.
引用本文: 舒杰, 白世彪, 崔豫, 等, 2017. 白龙江中游凤安山滑坡26Al暴露年代研究. 地质力学学报, 23 (6): 914-922.
SHU Jie, BAI Shibiao, CUI Yu, et al., 2017. STUDY ON 26Al EXPOSURE DATING OF FENG'ANSHAN LANDSLIDE IN THE MIDDLE REACHES OF BAILONG RIVER. Journal of Geomechanics, 23 (6): 914-922.
Citation: SHU Jie, BAI Shibiao, CUI Yu, et al., 2017. STUDY ON 26Al EXPOSURE DATING OF FENG'ANSHAN LANDSLIDE IN THE MIDDLE REACHES OF BAILONG RIVER. Journal of Geomechanics, 23 (6): 914-922.

白龙江中游凤安山滑坡26Al暴露年代研究

基金项目: 

2015年省重点研发计划(社会发展)项目 BE2015704

江苏高校优势学科建设工程 164320H101

中国科学院山地灾害与地表过程重点实验室开放基金项目 KLMHESP-17-07

详细信息
    作者简介:

    白世彪(1974-), 博士, 教授, 从事自然地理学和滑坡等自然灾害的相关研究。E-mail:shibiaobai@njnu.edu.cn

    通讯作者:

    舒杰(1993-), 硕士生, 从事滑坡宇生核素暴露年代学研究。E-mail:shujie0122@162.com

  • 中图分类号: P642.22;P597

STUDY ON 26Al EXPOSURE DATING OF FENG'ANSHAN LANDSLIDE IN THE MIDDLE REACHES OF BAILONG RIVER

  • 摘要: 准确地重建滑坡发生年代和复活期次是滑坡灾害风险评估与管理的关键步骤之一。近年来,随着AMS技术的发展,宇宙成因核素测年逐渐成为滑坡年代测定的有效手段之一。以甘肃省东南部白龙江中游的凤安山滑坡作为研究对象,在该滑坡后壁和其下方的大石块上各采集了1个宇生核素暴露年代样品,在综合考虑了遮蔽因子以及对该区域的侵蚀速率估算的基础上,研究了该滑坡的宇生核素26Al暴露年代。结果显示:该滑坡分别大约在0.72~0.75 ka和2.26~2.65 ka左右发生过,后者发生时间与该区公元前186年的地震型滑坡发生时间一致;对于年代越老的样品,侵蚀速率对宇生核素测年的年代结果影响越大。

     

  • 图  1  凤安山滑坡区地质图[11]

    Figure  1.  Geological map of Feng'anshan landslide area[11]

    图  2  凤安山滑坡主剖面图[9]

    (五角星标注位置为采样位置)

    Figure  2.  Principle profile map of Feng'anshan landslide[9]

    图  3  凤安山滑坡及采样点

    a-滑坡全貌图; b-滑坡后壁全貌图; c-局部滑坡后壁图; d-采样点位置图

    Figure  3.  Feng'anshan landslide and sampling location

    表  1  凤安山滑坡样品26Al浓度

    Table  1.   26Al concentration of the samples from Feng'anshan landslide

    样品编号 石英质量/g 26Al/27Al/×10-15 AMS26Al测量相对误差/% 26Al浓度/×104atoms/g
    Fas-1 29.76048 22.7569 19.10 2.56±0.49
    Fas-2 24.15329 14.6552 24.25 7.56±1.83
    *B3 - 1.39007
    注:-表示该数据为空,*表示所标注的样品为空白样
    下载: 导出CSV

    表  2  不同侵蚀速率下凤安山滑坡TCN 26Al暴露年代数据

    Table  2.   TCN 26Al Exposure ages in Feng'anshan landslide at different erosion rates

    样品编号 Fas-1 Fas-2
    采样深度/cm 3 4
    遮蔽因素 0.58 0.58
    26Al浓度 25658.104 75633.413
    不同侵蚀速率情境下基于Lal(1991)/Stone(2000)模型所换算得到的年代(10Be, ka) ε=0 mm/ka 0.69±0.14 2.02±0.52
    ε=8 mm/ka 0.70±0.15 2.05±0.54
    ε=11 mm/ka 0.70±0.15 2.06±0.54
    ε=29 mm/ka 0.71±0.15 2.12±0.58
    ε=60 mm/ka 0.72±0.16 2.26±0.65
    ε=130 mm/ka 0.75±0.17 2.65±0.92
    注:ε代表侵蚀速率
    下载: 导出CSV
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