Tracing time in the ocean: a brief review of chronological constraints (60-8聽kyr) on North Atlantic marine event-based stratigraphies
- 作者：William E.N. Austin ; bill.austin@st-andrews.ac.uk ; Fiona D. Hibbert
- 关键词：Marine chronostratigraphy ; Event-stratigraphy ; Tuning ; Radiocarbon ; Tephra
- 刊名：Quaternary Science Reviews
- 出版年：2012
- 期刊代码：78_02773791
- 类别：ear
- 出版时间：12 March, 2012
- 卷：36
- 期：Complete
- 页码：28-37
- 文件大小：641 K
摘要
Well-resolved event-based stratigraphies in marine sediments spanning a significant portion of the last glacial period (60-8聽kyr) provide a unique opportunity for time-stratigraphic correlation in the North Atlantic region. Here, we review the current methods available to chronologically constrain these event-based stratigraphies, highlighting, in particular, the value of tephrochronology as an independent tool to validate correlations between records. While the INTIMATE protocols (; Blockley et聽al., 2011) are equally applicable to marine and terrestrial records, spatially and temporally variable marine radiocarbon reservoir age effects (MREs) provide a challenge to using marine radiocarbon in the former as an independent chronostratigraphic tool. Despite the inherent uncertainties associated with 鈥榯uning鈥? we conclude that the mid-points of the common abrupt warming transitions associated with the well-defined, millennial-scale climate oscillations (the Dansgaard-Oeschger (D/O) cycles) observed in the oxygen isotopes of the Greenland ice cores and North Atlantic sea surface temperature (SST) records currently provide the most robust correlation tie-points from which to derive age control. In this invited INTIMATE special issue article we propose a new protocol for establishing marine event-based chronostratigraphies in the North Atlantic region and focus on areas of chronological potential in palaeoceanographic research.