中文摘要：

为马厩(88/86Sr ) 的高精确的大小的一个新方法并且放射产生(87Sr/86Sr ) Sr 同位素比率用括协议的 standard-sample-standard 在 MC-ICP-MS 上被开发。由小心地监视并且控制在山峰上背景的累积(即 carryover 记忆) 在仪器上，我们的方法能提供外部精确在附近

英文摘要：

A new method for high-precision measurements of stable （δ88/86Sr） and radiogenic （87Sr/86Sr） Sr isotope ratios was developed on the MC-ICP-MS using a standard-sample-standard bracketing protocol. By carefully monitoring and controlling the accumulation of the on-peak backgrounds （i.e. the carryover memory） on the instrument, our method can provide an external precision of around 0.010‰ to 0.014‰ for 88/86 Sr measurements. Such precision is comparable to that achieved by double-spike TIMS method （DS-TIMS）, and 2-3 times better than those of the previously reported results by MC-ICP-MS without spiking. The results of the standard seawater IAPSO are also identical to those by DS-TIMS. However, our method is more advantageous, efficient and convenient to use for routine Sr isotopic analysis than the DS-TIMS method as there is no need to prepare and calibrate the 84Sr-87 Sr double spike. Using this method, we measured the δ88/86Sr values in a series of international geological rock standards, which show large variability, with the lowest value （0.20‰） registered in JG-2, a terrestrial granite, and the highest value （0.539‰） in UB-N, a serpentinite. This may provide an additional means for isotopic characterization of geological processes, adding a new dimension over the traditional use of radiogenic Sr isotopic ratio 87Sr/86Sr.