Determination on 87 Sr/ 86 Sr ratio and stratigraphic dating of single-grain foraminifera
Chinese Science Bulletin(2006)
摘要
The Sr isotopic composition of foraminifera has been used in studies of chronstratigraphy and sedimentary geochemistry. However, it is difficult to sample foraminifera without overprinting of later diagenesis, which contains enough amount of Sr for isotopic measurement. Analysis of single-grain foraminifera was successively conducted by a combination of low Sr procedural blank and high precision determination of 87 Sr/ 86 Sr ratio. This combination of single-grain foraminifera can be significant for the study and application of Sr isotopic composition of foraminifera. Measured foraminifera of this study, having a size between 250 µm and 400 µm, were sampled from the carbonate basement of a ferromanganese crust in western Pacific. Mean value of 87 Sr/ 86 Sr ratios of the analyzed single-grain foraminifera is 0.709150 ±0.000013 with internal precision between 4 ppm and 8 ppm for each measurement run. Average value of total procedural blank of Sr is 14 pg. It is significant but difficult to date foraminifera in carbonate basements of ferromanganese crusts. Based on the obtained value of 87 Sr/ 86 Sr ratio, the analyzed foraminifera can be dated at 0.91 +0.33/−0.39 Ma.
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关键词
foraminifer,ferromanganese crust,single-grain,87Sr/86Sr ratios,dating
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