高精度珊瑚鈾釷定年技術及其古氣候重建之應用
Date Issued
2004
Date
2004
Author(s)
DOI
922116M002013
Abstract
We executed a new project “High
precision coral uranium-thorium dating
technique and its application to paleoclimatic
reconstruction” to apply our newly-developed
high precision U-Th analytical techniques to
date corals. We have solved three
fundamental problems. First, the isotopic
composition in spike solution has been
quantified precisely. Second, procedural
blanks have be reduced and characterized at
these low levels. 230 Th procedural blank was
only 20 (± 20) x 10 -18 g, corresponding to an
age uncertainty of 1-2-moths for coral 230 Th
dating. Third, the initial 230 Th incorporated
into growing aragonitic skeleton could be
well evaluated using isochron techniques.
The preliminary results demonstrate that the
age precision offered by our techniques can be
better than 1 year.
The developed 230 Th dating techniques
will be continuously applied to corals
collected from Nanwan, Sumatra Islands, and
Vanuatu, and other carbonates. We had three
refereed articles and ten conference papers
published during the period of August 2003 –
September 2004.
Subjects
230 Th dating
coral
ICPMS
Publisher
臺北市：國立臺灣大學地質科學系暨研究所
Type
report
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