DOI: 10.1007/s11069-020-03983-0
论文题名: Bouldery deposits along the Kherlen fault, Central Khentey, Mongolia: implications for paleoseismology
作者: Oh J.-S. ; Seong Y.B. ; Strom A. ; Yu B.Y.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2020
卷: 103, 期: 1 起始页码: 189
结束页码: 209
语种: 英语
中文关键词: 10Be surface exposure dating
; Bouldery deposit
; Earthquake
; Kherlen fault
; Landslide
; Outburst flood deposit
英文关键词: boulder
; deformation
; fault zone
; geological mapping
; geomorphology
; landslide
; paleoseismicity
; seismology
; slope failure
; tectonics
; topography
; trench
; Central Province [Mongolia]
; Khentey Mountains
; Mongolia
英文摘要: The assumed Jargalant rockslide is located in Khentey Upland of Mongolia, an area undergoing active tectonic deformation and seismogenic activity but where geomorphic research that connects rock slope failure and long-term paleoseismic events has yet to be conducted. We present the first reconnaissance study on this topic, which demonstrates the possibility of cosmogenic 10Be dating of landslide-induced bouldery deposits to date the timing of the assumed seismic events. We performed integrated geomorphic analysis (geomorphic mapping, topographic profile analysis, and surface trenching) and 10Be surface exposure dating (boulder and bedrock scar) to document the recurrence interval of the assumed paleoseismic events by determining the recurrence of rock slope failures in Jargalant River valley. We identified four geomorphic surfaces and units identified based on their morphology, the distribution of quartzite boulders, and their ages. The geomorphic units are as follows: (1) outburst flood fan (S1), (2) remnant landslide-dam deposit (S2), (3) surviving rockslide body (S3), and landslide scar (S4). Bedrock quartzite outcrops only in the assumed headscarp, while most of the upland is composed of schist. The average 10Be age of quartzite boulders of S1 to S3 is 283.4, 138.8, and 48.4 ka, respectively, and that of the landslide scar (inner and outer edge) are 44.5 and 193.5 ka. Based on the morphology, depositional characteristics, quartzite provenance, and separated and clustered 10Be exposure age, we hypothesize that at least three catastrophic rock slope failures could occur at 283 ka, 138 ka, and 48 ka, likely being triggered by earthquakes associated with active Kherlen fault. © 2020, Springer Nature B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/168655
Appears in Collections: 气候变化与战略
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作者单位: Department of Geography Education, Korea University, Anam-Ro 145, Seongbuk-Gu, Seoul, 02841, South Korea; Geodynamic Research Center, Branch of JSC “Hydroproject Institute”, Moscow, Russian Federation; AMS Laboratory, Advanced Analysis Center, Korea Institute of Science and Technology, Seoul, 02792, South Korea
Recommended Citation:
Oh J.-S.,Seong Y.B.,Strom A.,et al. Bouldery deposits along the Kherlen fault, Central Khentey, Mongolia: implications for paleoseismology[J]. Natural Hazards,2020-01-01,103(1)