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doi:10.2204/iodp.proc.319.201.2014

Results

Table T3 shows the results of chemical analyses of Samples 319-C0009A-130-SMW, 193-SMW, and 213-SMW obtained aboard the Chikyu by XRF and those obtained by ICP-AES during storage on shore. Analyses of the three samples during storage showed concentrations of 5.7–7.1 wt% for Al, 2.4–4.9 wt% for Ca, 2.3–3.3 wt% for Fe, 1.7–2.3 wt% for K, 0.8–1.2 wt% for Mg, 0.8–1.1 wt% for Na, 320–420 ppm for Ba, 22–37 ppm for Cr, 47–62 ppm for Li, 240–350 ppm for Mn, 140–260 ppm for Sr, and 60–96 ppm for Zn. Because shipboard XRF results took into account loss on ignition during sample preparation, the chemical compositions determined during storage on shore were slightly lower than those obtained shipboard. Figures F3 and F4 show the temporal variation of major and minor elements during sample storage. Some element concentrations (e.g., Ca in Sample 193-SMW) changed with increasing storage time (Fig. F3), but for most elements these changes were within measurement error. In Sample 130-SMW, the Al content decreased with increasing storage time, whereas in Sample 193-SMW the Al content increased with time. Before our analyses, we were particularly concerned about the possible influence of the large quantities of Na and K in drilling fluids; however, the contents of these elements were reasonably stable during storage.

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