IMHE OpenIR  > 山地灾害与地表过程重点实验室
Gradual late stage deepening of Gega ice-dammed lake, Tsangpo gorge, southeastern Tibet, indicated by preliminary sedimentary rock magnetic properties
Liu, Weiming1,2; Zhou, Gordon G. D.1; Ge, Yonggang1; Huang, Runqiu2
Corresponding AuthorLiu, Weiming(Liuwm@imde.ac.cn)
2018
Source PublicationACTA GEOPHYSICA
ISSN1895-7455
Volume66Issue:5Pages:907-914
SubtypeReview
AbstractGega lake, in southeastern Tibet, was formed by the blocking of Yarlung Tsangpo gorge by a glacier and is a well-known example of geomorphological damming. However, the evolution of the damming process at the site is still not understood in detail. Here, we use measurements of multiple magnetic parameters of the sediments from the Yusong (YS) 3 section, which is well-dated by optically stimulated luminescence, to provide a detailed history of the late stage of Gega dammed lake since 17.0 ka. Low-frequency field magnetic susceptibility (chi(lf)) increases upwards gradually from 25 to 79 x 10(-8) m(3)/kg above 5.5 m, but other magnetic properties, such as frequency-dependent magnetic susceptibility (chi(fd)% and (fd)), susceptibility of anhysteretic remanent magnetization (chi(ARM)), and saturation isothermal remanent magnetization (SIRM) did not show a similar degree of enhancement. The magnetic grain size indicators of chi(ARM)/chi(lf), chi(ARM)/SIRM, and chi(lf)/SIRM all indicate a trend of increasing magnetic grain size from the 5.5 m to the top of section; however, the bulk sediment grain size decreases gradually within the same interval. The total organic carbon is very low (0.2-0.7%), and thus, it is unlikely that the sedimentary environment is sufficiently strongly reducing to lead to the dissolution of magnetic minerals. Therefore, we infer that the coarsening-upwards of the magnetic grain size, and the increasing magnetic susceptibility from 5.5 m, reflect the gradual preferential preservation of magnetic minerals, caused by the deepening of the lake. Thus, we interpret the magnetic record of the section as reflecting the gradual deepening of the late stage of Gega ice-dammed lake. Last, the abrupt disappearance of the lake may have resulted in an outburst flood.
KeywordRock magnetic properties Lake deepening Outburst flood Tsangpo gorge
DOI10.1007/s11600-018-0191-5
Indexed BySCI
WOS KeywordRIVER INCISION ; OUTBURST FLOODS ; PLATEAU ; CHINA ; MEGAFLOODS ; DIAGENESIS ; GLACIER ; EROSION
Language英语
Quartile4区
Funding ProjectKey Research Program of Frontier Sciences, CAS[QYZDB-SSW-DQC010] ; National Natural Science Foundation of China[41661144028] ; National Natural Science Foundation of China[91747207] ; National Natural Science Foundation of China[41771023] ; Opening fund of the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology)[SKLGP2016K012]
TOP
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000448505400006
Funding OrganizationKey Research Program of Frontier Sciences, CAS ; National Natural Science Foundation of China ; Opening fund of the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology)
PublisherSPRINGER INTERNATIONAL PUBLISHING AG
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Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/24222
Collection山地灾害与地表过程重点实验室
Corresponding AuthorLiu, Weiming
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, CAS Key Lab Mt Hazards & Surface Proc, Chengdu 610041, Sichuan, Peoples R China
2.Chengdu Univ Technol, State Key Lab Geohazard Prevent & Geoenvironm Pro, Chengdu 610041, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Liu, Weiming,Zhou, Gordon G. D.,Ge, Yonggang,et al. Gradual late stage deepening of Gega ice-dammed lake, Tsangpo gorge, southeastern Tibet, indicated by preliminary sedimentary rock magnetic properties[J]. ACTA GEOPHYSICA,2018,66(5):907-914.
APA Liu, Weiming,Zhou, Gordon G. D.,Ge, Yonggang,&Huang, Runqiu.(2018).Gradual late stage deepening of Gega ice-dammed lake, Tsangpo gorge, southeastern Tibet, indicated by preliminary sedimentary rock magnetic properties.ACTA GEOPHYSICA,66(5),907-914.
MLA Liu, Weiming,et al."Gradual late stage deepening of Gega ice-dammed lake, Tsangpo gorge, southeastern Tibet, indicated by preliminary sedimentary rock magnetic properties".ACTA GEOPHYSICA 66.5(2018):907-914.
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