DOI: 10.1016/j.quascirev.2014.07.016
Scopus记录号: 2-s2.0-84909636466
论文题名: Seismic stratigraphy of Lake Van, eastern Turkey
作者: Cukur D. ; Krastel S. ; Schmincke H.-U. ; Sumita M. ; Çağatay M.N. ; Meydan A.F. ; Damci E. ; Stockhecke M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 104 起始页码: 63
结束页码: 84
语种: 英语
英文关键词: Ahlat ridge
; Lake Van
; Northern basin
; Sedimentary history
; Seismic reflection
; Tatvan basin
Scopus关键词: Ahlat ridge
; Lake vans
; Northern basins
; Seismic reflections
; Tatvan basin
; delta
; drilling
; fault
; geomorphology
; lacustrine deposit
; lake evolution
; sedimentation
; seismic reflection
; seismic stratigraphy
; turbidity
; Lake Van
; Turkey
英文摘要: More than 1500km of multi-channel seismic reflection profiles combined with ICDP (International Continental Scientific Drilling Program) drilling data, provide important insights into the stratigraphic evolution of Lake Van, eastern Turkey. Three major basins (Tatvan, Northern and the Deveboynu basins) comprise the main lake basin and are separated by morphological highs (Ahlat ridge and Northern ridge). Moreover, NE-SW faults, parallel to the general tectonic lineament of the area, dominate the entire basin and are in charge of creating graben and half-graben structures. Well-developed prograding deltaic sequences on top of the basement were recognized by seismic stratigraphy analysis. Most likely, they formed during the initial flooding of Lake Van ~600ka. The Tatvan basin sediments are dominated by mass-flow deposits of various origins alternating with undisturbed lacustrine sediments including distinct tephra layers. Faulting along the Tatvan basin margins may have triggered margin-wide slope failures. Ahlat ridge started to form between ca340ka-290ka. Since then, Ahlat ridge was sheltered from major mass-flows due to its elevation. Hence, slow lacustrine sedimentation has prevailed throughout lake history on Ahlat ridge, which was the location of the main drill site during the ICDP. Several lake level fluctuations are evident on the eastern slope area but the deep basins were permanently covered by water. A significant lake-level low stand (ca600kaBP) was found at ~610m below present lake level. The setting of the lake changed at about 30ka. Tectonic activity appears to have waned significantly as the mass-transport deposition decreased across the Tatvan basin while normal undisturbed lacustrine sedimentation prevailed. A different setting is found in the Northern basin from ca90ka to Present, especially due to the strong influx of mostly volcaniclastic turbidites causing sedimentation rates to be about 3.5 times higher (drill Site 1), than at Site 2 (Ahlat ridge). © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60133
Appears in Collections: 过去全球变化的重建
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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, Germany; Kiel University, Institute of Geosciences, Otto-Hahn-Platz 1, Kiel, Germany; Istanbul Technical University, EMCOL and Department of Geological Engineering, Maslak, Istanbul, Turkey; Van Yüzüncü Yil Univ., Department of Geological Engineering, Van, Turkey; Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Water Resources and Drinking Water, Überlandstrasse 133, Dübendorf, Switzerland; ETH Zurich, Climate Geology, Sonneggstrasse 5, Zurich, Switzerland
Recommended Citation:
Cukur D.,Krastel S.,Schmincke H.-U.,et al. Seismic stratigraphy of Lake Van, eastern Turkey[J]. Quaternary Science Reviews,2014-01-01,104