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| Title: | Kiritimati从1938到1993年同位素（delta 13C, delta 18O, Sr/Ca）数据 |
| Authors: | Michael Evans Richard G. Fairbanks James L. Rubenstone |
| Keywords: | 太平洋 印度洋 同位素 |
| Issue Date: | 6-Aug-2008 |
| Description: | Data and Methods: Stable isotope data Coral PP7-3 was collected live and cored at South West Point, Kiritimati Island, at 9 meters
depth in March 1994. The coral has been identified as Porites sp., probably P. australiensis, possibly P. lobata [D. Potts, UCSC, pers. comm.]. The core was slabbed along the growth axis and X-radiographed for densitometry study; slabs were then ultrasonically cleaned in de-ionized water and dried at 50
degrees C prior to sampling. Samples for oxygen and carbon isotope analyses were drilled from the slab at 0.5 mm intervals starting from just below the most recent growth and extending to a maximum depth of 1004 mm. A precise age model was recoverable for the upper 839.5 mm. Samples were drilled from lines
chosen parallel to the axis of maximum growth to avoid non-temporal (i.e. potential differential growth-related) isotopic effects [McConnaughey, 1989]. X-ray diffraction analyses of drilled and chipped coral aragonite verify that
samples were 100% aragonite after drilling. Sequential isotopic analyses were made using a Finnigan MAT-251 gas source mass spectrometer coupled to a Carousel-48 automated sample preparation device. Measurement precisions (1-sigma) were +/-0.06 per mil and +/- 0.04 per mil for o18 and c13 analyses,
based on analysis of a lab standard; sample replication over the 1981-1987 period (see section on Sr/Ca data below) gives an external precision of +/- 0.09 per mil in the o18 time series shown in Fig. 2. All stable isotope measurements are reported. On-line data are available free of charge, other forms are available for the cost of reproduction. |
| URI: | http://seekspace.resip.ac.cn/handle/2239/44829 |
| Appears in Collections: | 地球科学
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