白龙江中游凤安山滑坡~(26)Al暴露年代研究
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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。
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 ~(26)Al age of the landslide by using the method of ~(26)Al 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.
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 ~(26)Al age of the landslide by using the method of ~(26)Al 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.
引文
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[3]洪婷,白世彪,王建.树轮地貌学重建滑坡事件研究进展[J].地质论评,2014,60(4):755~764.HONG Ting,BAI Shibiao,WANG Jian.A review on study of landslide activities using Dendrogeomorphological methods[J].Geological Review,2014,60(4):755~764.(in Chinese with English abstract)
[4]田婷婷,吴中海,张克旗,等.第四纪主要定年方法及其在新构造与活动构造研究中的应用综述[J].地质力学学报,2013,19(3):242~266.TIAN Tingting,WU Zhonghai,ZHANG Keqi,et al.Overview of quaternary dating methods and their application in neotectonics and active tectonics research[J].Journal of Geomechanics,2013,19(3):242~266.(in Chinese with English abstract)
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[8]Pánek T.Recent progress in landslide dating:A global overview[J].Progress in Physical Geography,2015,39(2):168~198.
[9]谌文武,赵志福,刘高,等.兰州~海口高速公路甘肃段工程地质问题研究[M].兰州:兰州大学出版社,2006.70~73.ZHAN Wenwu,ZHAO Zhifu,LIU Gao,et al.Geoengineering Question in Gansu Province of the Highwar Form Lanzhou to Haikou[M].Lanzhou:Lanzhou University Press,2006.70~73.(in Chinese)
[10]刘高,张帆宇,李新召,等.凤安山滑坡地质过程研究[A].第二届全国岩土与工程学术大会[C].北京:科学出版社,2006.LIU Gao,ZHANG Fanyu,LI Xinzhao,et al.Study on geological process of the Feng’anshan Landslide[A].National Geotechnical and Engineering Conference[C].Beijing:Science Press,2006.(in Chinese)
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[12]郭长宝,张永双,王涛,等.南北活动构造带中段地质灾害与重大工程地质问题概论[J].地质力学学报,2017,23(5):707~722.GUO Changbao,ZHANG Yongshuang,Wang Tao,et al.Discussion on geological hazards and major engineering geological problems in the north-south active tectonic zone,China[J].Journal of Geomechanics,2017,23(5):707~722.(in Chinese with English abstract)
[13]郑龙,王文丽,马紫娟.宕昌县地震活动性分析与评价[J].甘肃科技,2016,32(2):12~16.ZHENG Long,Wang Liwen,MA Zijuan.Analysis and evaluation of seismic activity in Dangchang[J].Gansu Science and Technology,2016,32(2):12~16.(in Chinese)
[14]温晓婧.甘肃省陇南市宕昌县山洪灾害现状、防治存在问题及治理措施研究[J].西北水电,2011,(4):12~14.WEN Xiaojing.Study on status of mountain flood disasters in Tuochang county of Gansu province and counter measures[J].Northwest Hydropower,2011,(4):12~14.(in Chinese with English abstract)
[15]胡凯,方小敏,赵志军,等.宇宙成因核素10Be揭示的北祁连山侵蚀速率特征[J].地球科学进展,2015,30(2):268~275.HU Kai,FANG Xiaomin,ZHAO Zhijun,et al.Erosion rates of northern Qilian Mountains revealed by cosmogenic10Be[J].Advances in Earth Science,2015,30(2):268~275.(in Chinese with English abstract)
[16]Lal D.Cosmic ray labeling of erosion surfaces:in situ nuclide production rates and erosion models[J].Earth&Planetary Science Letters,1991,104(2/4):424~439.
[17]Dunai T J.Influence of secular variation of the geomagnetic field on production rates of in situ produced cosmogenic nuclides[J].Earth&Planetary Science Letters,2001,193(1~2):197~212.
[18]Gosse J C,Phillips F M.Terrestrial in situ cosmogenic nuclides:theory and application[J].Quaternary Science Reviews,2001,20(14):1475~1560.
[19]张志刚,王建,徐孝彬,等.利用宇生核素10Be暴露测年技术重建冰川漂砾运动历史[J].山地学报,2017,(4):590~597.ZHANG Zhigang,WANG Jian,XU Xiaobin,et al.Reconstructing movement history of glacial boulders by using10Be exposure dating method[J].Mountain Research,2017,(4):590~597.(in Chinese with English abstract)
[20]Ivy-Ochs S,Kober F.Surface exposure dating with cosmogenic nuclides[J].Quaternary Science Journal,2008,57(1/2):179~209.
[21]Brown E T,Edmond J M,Raisbeck G M,et al.Examination of surface exposure ages of Antarctic moraines using in situ,produced10Be and26Al[J].Geochimica et Cosmochimica Acta,1991,55(8):2269~2283.
[22]Kohl C P,Nishiizumi K.Chemical isolation of quartz for measurement of in-situ-produced cosmogenic nuclides[J].Geochimica et Cosmochimica Acta,1992,56(9):3583~3587.
[23]徐孝彬,王建,陈仕涛.陆面岩石中生成的同位素10Be与26Al的实验室提取方法[J].南京师大学报(自然科学版),2003,26(1):111~115.XU Xiaobin,WANG Jian,CHEN Shitao.Samples selection in terrestrial cosmogenic isotopes dating and extraction of10Be and26Al[J].Journal of Nanjing Normal University(Natural Science),2003,26(1):111~115.(in Chinese with English abstract)
[24]张志刚.稻城古冰帽第四纪冰川年代学研究[D].南京:南京师范大学,2014.ZHANG Zhigang.Quaternary glacial chronology of PaleoDaocheng ice cap,Southeastern Tibetan plateau,China[D].Nanjing:Nanjing Normal University,2014.(in Chinese with English abstract)
[25]徐孝彬,王建,Yiou F,等.地貌学与第四纪研究的新手段---陆地宇生核素研究[J].地理科学,2002,22(5):587~591.XU Xiaobin,WANG Jian,Yiou F,et al.New means in the study of geomorphology and quaternary-research of terrestrial cosmogenic isotopes[J].Scientia Geographica Sinica,2002,22(5):587~591.(in Chinese with English abstract)
[26]李英奎,Harbor J,刘耕年,等.宇宙核素地学研究的应用现状与存在问题[J].水土保持研究,2005,12(4):146~152.LI Yingkui,Jon Harbor,LIU Gengnian,et al.Applications and limitations of in-situ cosmogenic nuclides in earth sciences[J].Research of Soil and Water Conservation,2005,12(4):146~152.(in Chinese with English abstract)
[27]Dunne J,Elmore D,Muzikar P.Scaling factors for the rates of production of cosmogenic nuclides for geometric shielding and attenuation at depth on sloped surfaces[J].Geomorphology,1999,27(1/2):3~11.
[28]Gillespie A R,Bierman P R.Precision of terrestrial exposure ages and erosion rates estimated from analysis of cosmogenic isotopes produced in situ[J].Journal of Geophysical Research Atmospheres,1995,100(B12):24637~24650.
[29]Zerathe S,Braucher R,Lebourg T,et al.Dating chert(diagenetic silica)using in-situ-produced10Be:Possible complications revealed through a comparison with36Cl applied to coexisting limestone[J].Quaternary Geochronology,2013,17(3):81~93.
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