DOI: 10.1016/j.quascirev.2013.04.018
Scopus记录号: 2-s2.0-84879319960
论文题名: The changing architecture of sea-level lowstand deposits across the Mid-Pleistocene Transition: South Evoikos Gulf, Greece
作者: Anastasakis G. ; Piper D.J.W.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 73 起始页码: 103
结束页码: 114
语种: 英语
英文关键词: Aegean Sea
; Coastal progradation
; Continental shelf
; Pleistocene
; Sea level
; Sedimentation
; Seismic stratigraphy
Scopus关键词: Aegean sea
; Continental shelves
; Pleistocene
; Progradation
; Seismic stratigraphy
; Deposits
; Isotopes
; Offshore oil wells
; Sedimentation
; Seismic waves
; Stratigraphy
; Sea level
; benthos
; continental shelf
; erosion
; eustacy
; lowstand
; oxygen isotope
; Pleistocene
; progradation
; sediment transport
; sedimentation rate
; Aegean Sea
; Evvoikos Gulf
; Mediterranean Sea
英文摘要: On subsiding continental shelves, the style of stacked coastal and deltaic progradational packages is directly dependent on relative sea-level changes. In the past ~0.6Ma, sea-level change has been dominated by asymmetric 100ka eustatic sea-level cycles, whereas the record of sea-level changes in earlier Pleistocene progradational sequences is less clear. In a steadily subsiding basin in which accommodation balances sediment flux, the depth of a eustatic lowstand determines the paleo-depth of the deepest clinoform inflection point and the seaward limit of the erosional transgressive surface, whereas the duration of a lowstand controls the amount of progradation that takes place. We report high-resolution seismic profiles of an exceptionally preserved coastal progradational sequence from a coastal embayment in the Aegean Sea that is subsiding at ~100m/Ma. The seismic profiles show clinoforms of smaller amplitude and volume that were deposited before the 100ka cyclic progradational units. This contrasts with literature reports of complexity in progradational sequences at that time. We assume that published stacked benthic foram O-isotope records are a good proxy for the duration and a reasonable proxy for the amplitude of Pleistocene eustatic sea-level cycles. The MIS 6-5 eustatic sea-level rise is recognised based on sedimentation rates from cores. The underlying major progradational units are correlated with the long-duration, extreme lowstand 100ka cycles of MIS 6, 12 and 16. Changes in the elevation of lowstand inflection points in clinoforms are used to tentatively extend the record back to MIS 38, by comparison with the benthic foram proxy. The deposits of the higher and longer highstands of MIS 25, 31 and 37 are also recognised. This record provides a testable template for future studies of short early Pleistocene sections on land and raises questions of detail about parts of the published δ18O records. It independently supports the recent evidence that the Mid-Pleistocene transition was an abrupt event, with an extreme lowstand in MIS 22. © 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60580
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Faculty of Geology and Geoenvironment, University of Athens, Panepistimiopolis, Athens 15784, Greece; Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, NS B2Y 4A2, Canada
Recommended Citation:
Anastasakis G.,Piper D.J.W.. The changing architecture of sea-level lowstand deposits across the Mid-Pleistocene Transition: South Evoikos Gulf, Greece[J]. Quaternary Science Reviews,2013-01-01,73