白龙江中游凤安山滑坡<sup>26</sup>Al暴露年代研究

舒杰; 白世彪; 崔豫; 陈倩; 张志刚; 王建

白龙江中游凤安山滑坡²⁶Al暴露年代研究

舒杰^1, ,,
白世彪^{1, 2, 3, 4,},
崔豫¹,
陈倩¹,
张志刚^{1, 2, 3, 4},
王建^{1, 2, 3, 4}

1.
南京师范大学地理科学学院, 江苏南京 210023
2.
虚拟地理环境教育部重点实验室(南京师范大学), 江苏南京 210023
3.
江苏省地理环境演化国家重点实验室培育建设点, 江苏南京 210023
4.
江苏省地理信息资源开发与利用协同创新中心, 江苏南京 210023

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
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出版历程
- 收稿日期: 2017-05-06
- 刊出日期: 2017-12-01

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

SHU Jie^{1
, ,},
BAI Shibiao^{1, 2, 3, 4
,},
CUI Yu¹,
CHEN Qian¹,
ZHANG Zhigang^{1, 2, 3, 4},
WANG Jian^{1, 2, 3, 4}

1.
School of Geopraphy Science, Nanjing Normal University, Nanjing 210023, Jiangsu China
2.
Key Laboratory of Virtual Geographic Environment(Nanjing Normal University), Ministry of Education, Nanjing 210023, Jiangsu China
3.
State Key Laboratory Cultivation Base of Geographical Environment Evolution(Jiangsu Province), Nanjing 210023, Jiangsu China
4.
Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, Jiangsu China

摘要

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。
- 凤安山滑坡 /
- 宇生核素测年 /
- 滑坡事件年代 /
- 侵蚀速率
Abstract: Knowledge about the formation age and reactivation times of paleo-landslide are critical for landslide hazard assessment and management. With the development of AMS technology, cosmogenic nuclide dating method has been effectively applied in determining the formation age of paleo-landslide. In this study, the Feng'anshan landslide, which is located at the middle reaches of Bailong River in Southeast Gansu Province, was taken as the study target. Two rock samples, Fas-2 and Fas-1, were obtained from the landslide scarp and a block below the scarp respectively. Considering the masking factors and erosion rate of the sampling site, we calculated the ²⁶Al age of the landslide by using the method of ²⁶Al exposure dating with the cosmic nuclide. The main conclusions are as follows:(1) Two landslide events occurred at about 0.72~0.75 ka and 2.26~2.65 ka respectively. The latter formation age corresponds to the documented year of 186 BC in historical descriptions, when earthquakes induced the landslide. (2) The erosion rate has more impact on the dating results of samples with old ages.
- Feng'anshan landslide /
- cosmogenic nuclide dating /
- age of the landslide event /
- erosion rate

HTML全文

图 1 凤安山滑坡区地质图^[11]

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

下载: 全尺寸图片幻灯片

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]

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

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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