DOI: 10.1007/s00531-012-0816-x
Scopus记录号: 2-s2.0-84874019371
论文题名: Sedimentary evolution of Lake Van (Eastern Turkey) reconstructed from high-resolution seismic investigations
作者: Cukur D. ; Krastel S. ; Demirel-Schlüter F. ; Demirbaǧ E. ; Imren C. ; Niessen F. ; Toker M.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 2 起始页码: 571
结束页码: 585
语种: 英语
英文关键词: Clinoform
; Lake Van
; Lake-level fluctuations
; Mass-flow
; Seismic data
; Seismic facies
Scopus关键词: erosion
; lacustrine deposit
; lake level
; sedimentary sequence
; seismic reflection
; tephra
; Lake Van
; Turkey
英文摘要: This paper presents results of a multi-channel seismic reflection survey at Lake Van and provides constraints on the sedimentary evolution of the lake. The geophysical data of the lake confirm the existence of three physiographic provinces: a shelf, a slope, and a deep, relatively flat basin. The most prominent features identified on the shelf and slope are clinoforms, submerged channels, as well as closely spaced lake floor depressions, reflecting a highly variable lake-level history. The morphological depressions are interpreted as resulting from subaquatic erosion by channelized, sediment-laden currents into horizontally bedded fan sediments. Submerged channels on the eastern shelf are interpreted as meandering-slope channels, probably as a consequence of a lake-level fall that exposed the shelf area. Clinoforms on the Eastern fan may represent relict deltas formed during stationary or slightly rising lake-level intervals. Merging subsurface imaging interpretation with morphological studies of exposed sediments reveals lake-level fluctuations of several hundreds of meters during the past ca. ~550 ka. The lake has three prominent basins (Tatvan, Deveboynu, and the Northern basin) separated by basement ridges (e. g., the Northern ridge). The seismic units in the Tatvan and Northern basins are dominated by alternations of well-stratified and chaotic reflections, while the Deveboynu basin subsurface consists mainly of chaotic units. The chaotic seismic facies are interpreted as mass-flow deposits, probably triggered by earthquakes and/or rapid lake-level fluctuations. The moderate-to-high-amplitude, well-stratified facies seen in the deeper parts of the basins are interpreted as lacustrine deposits intercalated with tephra layers. The occurrence of a clinoform in the deepest part of the lake suggests a major flooding stage of Lake Van more than ~400 ka ago. Seismic profiles from the deepest part of the lake basin show remarkably uniform and continuous stratigraphic units without any major erosional feature following the flooding event, indicating that the lake was never completely dry afterward and therefore significantly older than previously suggested. © 2012 Springer-Verlag. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84874019371&doi=10.1007%2fs00531-012-0816-x&partnerID=40&md5=4d7b435f4bfe02c2db9f10fe7f64d573
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70569
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, 24148 Kiel, Germany; Department of Geosciences, University of Bremen, Bremen, Germany; Department of Geophysical Engineering, Istanbul Technical University, Ayazaga Campus, Maslak-Istanbul, Turkey; Alfred Wegener Institute for Polar and Marine Research, 27515 Bremerhaven, Germany; Eurasia Institute of Earth Sciences, Istanbul Technical University, Ayazaga Campus, Maslak-Istanbul, Turkey
Recommended Citation:
Cukur D.,Krastel S.,Demirel-Schlüter F.,et al. Sedimentary evolution of Lake Van (Eastern Turkey) reconstructed from high-resolution seismic investigations[J]. International Journal of Earth Sciences,2013-01-01,102(2)