Optical dating of perennially frozen deposits associated with preserved ancient plant and animal DNA in north-central Siberia

被引:44
作者
Arnold, L. J. [1 ]
Roberts, R. G. [1 ]
MacPhee, R. D. E. [2 ]
Willerslev, E. [3 ]
Tikhonov, A. N. [4 ]
Brock, F. [5 ]
机构
[1] Univ Wollongong, Geoquest Res Ctr, Sch Earth & Environm Sci, Wollongong, NSW 2522, Australia
[2] Amer Museum Nat Hist, Div Vertebrate Zool, New York, NY 10024 USA
[3] Univ Copenhagen, Inst Biol, Ctr Ancient Genet, DK-2100 Copenhagen, Denmark
[4] Russian Acad Sci, Inst Zool, Lab Mammals, St Petersburg 199034, Russia
[5] Univ Oxford, Archaeol & Hist Art Res Lab, Oxford Radiocarbon Accelerator Unit, Oxford OX1 3QY, England
基金
英国惠康基金; 澳大利亚研究理事会;
关键词
optically stimulated luminescence dating; single-grain; ancient DNA; Siberia;
D O I
10.1016/j.quageo.2007.09.002
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
We present chronological constraints on a suite of permanently frozen fluvial deposits which contain ancient DNA (aDNA) from the Taimyr Peninsula of north-central Siberia. The luminescence phenomenology of these samples is first discussed, focusing on the optically stimulated luminescence (OSL) decay curve characteristics, thermoluminescence (TL) properties, and signal compositions of quartz from these previously unstudied deposits. Secondly, we assess the suitability of these samples for OSL dating and present the OSL chronologies obtained using both single-grain and multi-grain equivalent dose (De) measurements. The results of our analyses reveal a large amount of inter-aliquot variability in OSL decay curve shape that is directly related to differences in the size of the 280 degrees C TL peak and the associated slowly bleached 'S2' OSL component. Longer OSL stimulation durations are adopted in the D, measurement procedure to prevent the progressive build-up of slowly bleached signal components throughout successive single-aliquot regenerative-dose (SAR) measurement cycles. The use of low preheat temperatures in the SAR procedure also reduces the deleterious effects of these slowly bleached signal components. The resultant single-grain and multi-grain OSL chronologies obtained using this approach are stratigraphically consistent and are in close agreement with independently established 14 C ages at our sites. The findings of this research reveal the potential of OSL dating as a means of providing a reliable chronometric framework for sedimentary aDNA records in permafrost environments. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:114 / 136
页数:23
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