DOI: 10.1016/j.palaeo.2014.03.039
论文题名: Insight into the latest Messinian (5.7-5.2Ma) palaeoclimatic events from two deep-sea Atlantic Ocean ODP Sites
作者: Vautravers M.J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 407 起始页码: 14
结束页码: 24
语种: 英语
英文关键词: Climatic seesaw
; Deglaciation
; Late Messinian
; Mio-Pliocene transition
; Planktonic foraminifera
英文摘要: The results of a multi-proxy study, including quantitative planktonic foraminifera faunal analysis, geochemistry of foraminifera tests, and lithogenic counts (IRD) are presented for two open marine sites. The sites are located in the eastern South Atlantic (ODP Leg 177 Site 1088) and the western tropical North Atlantic (ODP Leg 154 Site 925). Both sedimentary records span the interval 5.7-5.2. Ma (i.e. late Miocene to early Pliocene), which encompasses the time of deposition of the upper evaporites (UE) in the Mediterranean basin. The observations confirm a major oceanographic and climatologic event which occurred during the Messinian at the transition between the glacial TG12 and the prominent TG11 warm interglacial at 5.5. Ma. However, some oceanographic changes also occurred at the Miocene-Pliocene (M-P) transition in the northern tropical Atlantic and in the Southern Ocean with the first input of IRD at ODP Site 1088. In contrast to the termination across the lower evaporites (LE) at 5.5. Ma, the M-P transition may not have involved a large change in ice volume. The potential causes behind the data across the major climatic transient are examined in the light of published information, including evidence from polar areas with focus on the climatic impact of fluctuating meridional oceanic circulation (MOC). A thermal seesaw mechanism in pre-Quaternary times is hypothesised as part of the large late Messinian deglaciation across the TG12-TG11 transition. An implication of the major Southern Atlantic warming before 5.5. Ma is that an abrupt event freshening the surface of the North Atlantic might be present in the sub-polar Northern Hemisphere, but this has yet to be verified. This deglaciation may have been reinforced by a freshening of the North Atlantic as a result of discontinuous connection of the Mediterranean Sea. © 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69314
Appears in Collections: 过去全球变化的重建
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作者单位: British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, United Kingdom; Godwin Institute for Paleoclimatic Research, Cambridge University, CB2 3EQ Cambridge, United Kingdom
Recommended Citation:
Vautravers M.J.. Insight into the latest Messinian (5.7-5.2Ma) palaeoclimatic events from two deep-sea Atlantic Ocean ODP Sites[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,407