High-precision 238U-234U-230Th disequilibrium dating of the recent past: A review

Zhao, Jian-xin, Yu, Ke-fu and Feng, Yue-xing (2009) High-precision 238U-234U-230Th disequilibrium dating of the recent past: A review. Quaternary Geochronology, 4 5: 423-433. doi:10.1016/j.quageo.2009.01.012


Author Zhao, Jian-xin
Yu, Ke-fu
Feng, Yue-xing
Title High-precision 238U-234U-230Th disequilibrium dating of the recent past: A review
Formatted title
High-precision 238U-234U-230Th disequilibrium dating of the recent past: A review
Journal name Quaternary Geochronology   Check publisher's open access policy
ISSN 1871-1014
Publication date 2009-10
Sub-type Article (original research)
DOI 10.1016/j.quageo.2009.01.012
Volume 4
Issue 5
Start page 423
End page 433
Total pages 11
Editor R. Grün
Place of publication Oxford, England
Publisher Elsevier Sci
Collection year 2010
Language eng
Subject C1
0402 Geochemistry
970104 Expanding Knowledge in the Earth Sciences
Formatted abstract
Although it was demonstrated 20 years ago that mass spectrometric U–Th methods are capable of high-precision dating of young corals, the use of this approach to decipher recent environmental, climatic and archaeological records is still restricted and its potential has not yet been widely recognised. U–Th methods are typically used to determine the ages of carbonate materials such as speleothem and coral. Dating young carbonates of this sort is challenging. Their extremely low 230Th content necessitates stricter instrumental and laboratory conditions than those required for dating older samples. Moreover, analyses must be corrected for the presence of non-radiogenic 230Th, which is proportionally far more significant than in older samples. Nevertheless, 2σ precisions of around ±1–10 years are readily achievable for pristine coral samples dating from the last 500 years. Although the range of analytical precisions for speleothems may vary more widely depending on U concentrations and levels of non-radiogenic 230Th correction, published studies reveal 2σ precisions of around ±10–80 years for typical speleothems. This paper demonstrates how the U–Th method may be applied to establish the causes of recent coral mortality, to determine the recurrence interval of extreme wave events, to investigate earthquake frequency and neotectonic uplift, to reconstruct recent climatic history, and to understand settlement patterns and sociopolitical changes in Polynesia prior to European contact.
Keyword Uranium-thorium dating
Coral
Speleothem
Mass spectrometry
Recent past
South China Sea
Great-Barrier-Reef
Multiple-Collector Icpms
Holocene Asian Monsoon
U-Series
Climate-Change
Mc-Icpms
Isotope Ratios
Coral-Reefs
Delta-O-18 Records
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Centre for Microscopy and Microanalysis Publications
 
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Created: Mon, 23 Nov 2009, 15:24:58 EST