中文摘要：

有孔虫类的 Sr 同位素的作文在研究 ofchronstratigraphy 和沉积地球化学被使用了。然而，没有以后的成岩作用套印，取样有孔虫类是困难的，它为同位素的测量包含 Sr 的足够的数量。单个谷物的有孔虫类的分析被 ~(87 ) 的低 Sr 程序的空白、高的精确决心的联合连续地进行 Sr/~(86 ) Sr 比率。单个谷物的有孔虫类的这联合能为有孔虫类的 Sr 同位素的作文的学习和申请是重要的。测量了这研究的有孔虫类，有在 250 亩 m and400 瓮之间的一种尺寸，在西方的太平洋从一个铁锰合金外壳的碳酸盐地下室被取样。~(87 ) 的吝啬的价值分析单个谷物的有孔虫类的 Sr/~(86 ) Sr 比率是 0.709150 +-0.000013 与内部，在 4 ppm 之间的精确和为每大小的 8 ppm 跑。Sr 的全部的程序的空白的平均价值是 14 pg。在铁锰合金外壳的碳酸盐地下室标明日期有孔虫类重要却困难。把 Sr/~(86 ) 基于 ~(87 ) 的获得的价值 Sr 比率，分析有孔虫类能在 0.91 +0.33/-0.39 妈被标明日期。

英文摘要：

The Sr isotopic has been used in studies of composition of foraminifera 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 ^87Sr/^86Sr 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 250μm and 400μm, were sampled from the carbonate basement of a ferromanganese crust in western Pacific. Mean value of 87Sr/86Sr ratios of the analyzed single-grain foraminifera is 0.709150 ±0.000013 with internal precision between 4ppm 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 ^87Sr/^86Sr ratio, the analyzed foraminifera can be dated at 0.91 ±0.33/-0.39 Ma.