DOI: 10.1016/j.palaeo.2015.01.020
论文题名: Recurrent phases of drought in the upper Miocene of the Black Sea region
作者: Vasiliev I. ; Reichart G.-J. ; Grothe A. ; Sinninghe Damsté J.S. ; Krijgsman W. ; Sangiorgi F. ; Weijers J.W.H. ; van Roij L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 423 起始页码: 18
结束页码: 31
语种: 英语
英文关键词: Alkenones
; Black Sea
; Carbon isotopes
; Hydrogen isotopes
; Miocene
; N-Alkanes
; Palynology
; SSTs
; TEX86
英文摘要: Since the Miocene the Black Sea proved to be highly sensitive to fluctuations in the hydrological cycle because of its recurrent restricted connections with the open ocean and the location between the dry Mediterranean and more humid higher northern latitudes. Although the Black Sea formed one of the foci of the 1975 Deep Sea Drilling Project Leg 42B, robust tools to reconstruct past changes in its hydrological cycle were lacking at that time. Here we revisit the sedimentary succession (Hole 380A) and determined compound-specific carbon (δ13C) hydrogen isotope ratios (δD) of terrestrial and aquatic biomarkers to investigate changes in the hydrological budget of the Black Sea during the late Miocene. The δ13C and δD isotopic composition of n-alkanes as well as alkenones and palynology indicate large environmental changes in the Black Sea and/or in the sources of the water entering the Black Sea during the late Miocene. The δD of alkenones, showing an enrichment of more than 80‰ at the end of the Miocene, implies a major shift in basin hydrology, possibly resulting in severely increased salinity. These changes in δD composition of the alkenones coincide with both with sharp shifts in reconstructed sea surface temperature and palynological assemblages. Two intervals with negative water budget were identified, most likely caused by enhanced evaporation. The older and longer dry/evaporative phase predates the Maeotian/Pontian boundary (regional stages) at ~6.1Ma. The younger drying phase corresponds to the Messinian Salinity Crisis. This shift to highly evaporative conditions is related to a similar shift previously observed in a Messinian (Pontian) sedimentary succession from the Taman Peninsula (Russia). These recurrent dry phases likely reflect regional climatic shifts over a significantly larger area around the Black Sea area during the upper Miocene. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69005
Appears in Collections: 过去全球变化的重建
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作者单位: Organic Geochemistry, Department of Earth Sciences, Utrecht University, Budapestlaan 4, Utrecht, Netherlands; Paleomagnetic Laboratory 'Fort Hoofddijk', Department of Earth Sciences, Utrecht University, Budapestlaan 17, Utrecht, Netherlands; Royal Netherlands Institute of Sea Research, P.O. Box 59, Den Burg, Texel, Netherlands; Marine Palynology and Paleoceanography, Laboratory of Palaeobotany and Palynology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, Utrecht, Netherlands
Recommended Citation:
Vasiliev I.,Reichart G.-J.,Grothe A.,et al. Recurrent phases of drought in the upper Miocene of the Black Sea region[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,423