DOI: 10.1016/j.quascirev.2017.12.004
Scopus记录号: 2-s2.0-85037996105
论文题名: Coastal cliffs, rock-slope failures and Late Quaternary transgressions of the Black Sea along southern Crimea
作者: Pánek T. ; Lenart J. ; Hradecký J. ; Hercman H. ; Braucher R. ; Šilhán K. ; Škarpich V.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 181 起始页码: 76
结束页码: 92
语种: 英语
Scopus关键词: Binary alloys
; Landslides
; Limestone
; Rocks
; Slope stability
; Thorium alloys
; Uranium alloys
; Geomorphic evidence
; Karstification
; Late Pleistocene
; Late quaternary
; Late Triassic
; Lateral spreading
; Rock slope failure
; Slope deformation
; Landforms
; catastrophic event
; cliff
; escarpment
; flysch
; geoaccumulation
; geochronology
; hazard assessment
; Holocene
; humid tropics
; limestone
; rock mechanics
; slope failure
; speleothem
; Black Sea
; Crimea
; Crimean Mountains
; Ukraine
英文摘要: Rock-slope failures represent a significant hazard along global coastlines, but their chronology remains poorly documented. Here, we focus on the geomorphology and chronology of giant rockslides affecting the Crimean Mountains along the Black Sea coast. Geomorphic evidence suggests that high (>100 m) limestone cliffs flanking the southern slopes of the Crimean Mountains are scarps of rockslides nested within larger deep-seated gravitational slope deformations (DSGSDs). Such pervasive slope failures originated due to lateral spreading of intensively faulted Late Jurassic carbonate blocks moving atop weak/plastic Late Triassic flysch and tuff layers. By introducing a dating strategy relying on the combination of the uranium-thorium dating (U-Th) of exposed calcareous speleothems covering the landslide scarps with the 36Cl exposure dating of rock walls, we are able to approximate the time interval between the origin of incipient crevices and the final collapse of limestone blocks that exposed the cliff faces. For the three representative large-scale rockslides between the towns of Foros and Yalta, the initiation of the DSGSDs as evidenced by the widening of crevices and the onset of speleothem accumulation was >300 ka BP, but the recent cliff morphology along the coast is the result of Late Pleistocene/Holocene failures spanning ∼20–0.5 ka BP. The exposures of rockslide scarps occurred mostly at ∼20–15, ∼8, ∼5–4 and ∼2–0.5 ka, which substantially coincide with the last major Black Sea transgressions and/or more humid Holocene intervals. Our study suggests that before ultimate fast and/or catastrophic slope failures, the relaxation of rock massifs correlative with karstification, cracks opening, and incipient sliding lasted on the order of 104–105 years. Rapid Late Glacial/Holocene transgressions of the Black Sea likely represented the last impulse for the collapse of limestone blocks and the origin of giant rockslides, simultaneously affecting the majority of the SW coast of the Crimean Peninsula. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112314
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physical Geography and Geoecology, Faculty of Science, University of Ostrava, Chittussiho 10, Ostrava, 710 00, Czech Republic; Institute of Geological Sciences, Polish Academy of Sciences, Twarda 51/55, Warszawa, 00-818, Poland; Aix-Marseille Univ., CNRS-IRD-Collège de France, UM 34 CEREGE, Technopôle de l'Environnement Arbois–Méditerranée, BP80, Aix-en-Provence, 13545, France
Recommended Citation:
Pánek T.,Lenart J.,Hradecký J.,et al. Coastal cliffs, rock-slope failures and Late Quaternary transgressions of the Black Sea along southern Crimea[J]. Quaternary Science Reviews,2018-01-01,181