Optical dating of deep-sea sediments using single grains of quartz: a comparison with radiocarbon

被引:109
作者
Olley, JM
De Deckker, P
Roberts, RG
Fifield, LK
Yoshida, H
Hancock, G
机构
[1] CSIRO Land & Water, Canberra, ACT 2601, Australia
[2] Australian Natl Univ, Dept Earth & Marine Sci, Canberra, ACT 0200, Australia
[3] Univ Wollongong, Sch Earth & Environm Sci, GeoQuEST Res Sch, Wollongong, NSW 2522, Australia
[4] Australian Natl Univ, Dept Nucl Phys, Res Sch Phys Sci & Engn, Canberra, ACT 0200, Australia
基金
澳大利亚研究理事会;
关键词
geochronology; luminescence; optical dating; single grains; radiocarbon; Indian Ocean; deep-sea core; palaeoceanography; Late Quaternary;
D O I
10.1016/j.sedgeo.2004.05.005
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
In this paper, we demonstrate that optical dating of single grains of quartz offers an alternative means of dating deep-sea sediments. The precision and accuracy of the technique, which has the potential to date sediments deposited during the last 500,000 years or so, is limited by the random and systematic uncertainties associated with producing optical ages. These result in total relative age uncertainties of between 10% and 20% at the 68% confidence interval, which are similar in size to those associated with Late Quaternary oxygen-isotope chronologies. We analysed single grains of quartz from several depth intervals down core Fr10/95-GC 17, which was collected offshore from Cape Range Peninsula, Western Australia, from a water depth of 1093 m in the eastern Indian Ocean. The single-grain optical ages are shown to be consistent with AMS radiocarbon ages obtained from planktonic foraminifera from the same core. We also show that marine sediments are not immune from partial or heterogeneous bleaching (incomplete resetting) of the optical dating signal. Where partial or heterogeneous bleaching of the optical dating signal is indicated, we recommend that single-grain dating be employed and the burial dose estimated from the population of grains with the lowest absorbed radiation dose. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:175 / 189
页数:15
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