DOI: 10.1016/j.quascirev.2014.02.012
Scopus记录号: 2-s2.0-84896113257
论文题名: Anomalous MIS 7 sea level recorded on Bermuda
作者: Rowe M.P. ; Wainer K.A.I. ; Bristow C.S. ; Thomas A.L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 90 起始页码: 47
结束页码: 59
语种: 英语
英文关键词: Bermuda
; Corals
; Faulting
; Glacio-isostasy
; Quaternary
; Sea level
; U-series dating
Scopus关键词: Deposits
; Faulting
; Bermuda
; Corals
; Glacio isostasies
; Quaternary
; U-series dating
; Sea level
; allostratigraphy
; coral
; glacioisostasy
; Quaternary
; sea level
; uranium series dating
; Bermuda
英文摘要: Three new U-series ages from coral fragments found in the Belmont Formation of Bermuda fall in a range of ~198ka to ~196ka. These late MIS 7 ages are consistent with those of ~201ka and ~199ka measured in a previous study. The disputed interpretation of the Belmont Formation as a unit that is allostratigraphically distinct from subsequent MIS 5e deposits, of the Rocky Bay Formation, is vindicated by a minimum age of 196±3ka for the total of 6 coral fragments it has yielded. Emergent marine deposits of the Belmont Formation include sedimentary lithofacies that are considered to be reliable relative sea level indicators. Prominent among these is a facies representing the "beach step": a feature that develops sub-tidally, directly at the base of the swash zone. From this facies, and others preserved along 6km of Belmont Formation coastal exposure, it is concluded that MIS 7 relative mean sea level reached+4.5m, and likely peaked at or above+6.0m, relative to present sea level at Bermuda. Lower MIS 7 sea level positions that are evidenced and that have been quoted, in the past, are considered transitory positions, not maxima. The MIS 7 sea-level elevations on Bermuda, reconstructed in this study, are above the majority of those reported from elsewhere in the world. This challenges the long-standing notion of Bermuda as a vertically stable "tide-gauge", but is consistent with glacio-hydroisostatic models which predict land-mass subsidence at intermediate field sites, such as Bermuda, at the end of long interglacials. However, because of evidence of instability at Bermuda in the form of seismic activity and faulting, which require further investigation, judgement is reserved on the global implications of this palaeo-sea-level anomaly. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60330
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Planetary Sciences, Birkbeck, University of London, Malet Street, Bloomsbury, London WC1E 7HX, United Kingdom; Department of Earth Sciences, Oxford University, South Parks Road, Oxford OX1 3AN, United Kingdom; School of Geoscience, University of Edinburgh, Grant Institute, The King's Buildings, West Mains Road, Edinburgh EH9 3JW, United Kingdom
Recommended Citation:
Rowe M.P.,Wainer K.A.I.,Bristow C.S.,et al. Anomalous MIS 7 sea level recorded on Bermuda[J]. Quaternary Science Reviews,2014-01-01,90