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doi:10.2204/iodp.proc.322.207.2013

Analytical methods

The isotopic composition of Sr was measured in pore fluid samples recovered from Sites C0011 and C0012. Pore fluids were directly loaded into the separation columns after acidification. Sr separation was carried out using a 50 µL Sr-specific column and resin from EICHROM. Isotopic analysis of a solution containing 300 ng Sr was performed using the Nu Plasma multicollector inductively coupled mass spectrometer (MC-ICPMS) housed in the W.M. Keck Collaboratory for Plasma Spectrometry in the College of Oceanic and Atmospheric Science at Oregon State University (OSU-COAS; USA). ⁸⁷Sr/⁸⁶Sr data were normalized to National Bureau of Standards standard NBS 987, with a reported ⁸⁷Sr/⁸⁶Sr value of 0.710245. A mean value of 0.710225 ± 0.000052 (2σ mean; n = 91) was obtained for repeated measurements. Replicate analysis of an in-house standard yielded a ⁸⁷Sr/⁸⁶Sr ratio of 0.708170 ± 0.000051 (2σ mean; n = 79).

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