DOI: 10.1016/j.earscirev.2019.102931
论文题名: Meltwater floods into the Black and Caspian Seas during Heinrich Stadial 1
作者: Yanchilina A.G. ; Ryan W.B.F. ; Kenna T.C. ; McManus J.F.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2019
卷: 198 语种: 英语
中文关键词: Black Sea
; Caspian Sea
; Eurasian Ice Sheet
; Manych Strait
; Megaflood
; Meltwater
英文关键词: bedrock
; deglaciation
; flood
; Heinrich event
; ice sheet
; marine sediment
; meltwater
; oxygen isotope
; sea ice
; strontium isotope
; Black Sea
; Caspian Sea
; Mollusca
; Ostracoda
英文摘要: Deglaciation of the Eurasian Ice Sheet dispensed vast amounts of meltwater laden with red-brown clay into Black and Caspian Sea's freshwater lakes between 16,350 and 15,400 calendar years BP. The arriving sediment had a mineral composition and strontium-neodymium isotope signatures (87Sr/86Sr, and εNd) consistent with the crystalline bedrock that lay beneath the ice sheet as opposed to sources from landscapes crossed by the rivers that carried meltwater to the lakes. The magnitude and rapidity of the shifts of 87Sr/86Sr and δ18O in shells of ostracods and mollusks, an eight-fold increase in sediment accumulation rate, and a plunge of 1250 14C years in the radiocarbon reservoir age indicate a volume of meltwater sufficient to have replaced most or all of the pre-existing lake water. If the release of >25,000 km3 of water from the Caspian into the Black Sea's New Euxine Lake was abrupt by judging the magnitude of erosion in the floor of the Manych Strait spillway, this event qualifies as a megaflood. Deeply-scoured furrows, channel floor bars, and swaths of mounds 5–20 km in length and 5–20 m in height are reminiscent of scabland landscapes. The meltwater is coincident with Heinrich Stadial 1 when the Alpine and Eurasian ice sheets re-advanced and temperatures of the Black Sea's lake surface remained cold. Sand grains within the red-brown clay indicate they were transported by lake surface ice. © 2019 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165966
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Planetary Sciences, Weizmann Institute of Science, 234 Hertzl Street, Rehovot, 7610001, Israel; Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, New York, 10964, United States
Recommended Citation:
Yanchilina A.G.,Ryan W.B.F.,Kenna T.C.,et al. Meltwater floods into the Black and Caspian Seas during Heinrich Stadial 1[J]. Earth Science Reviews,2019-01-01,198