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The two methods of estimating sediment accumulation rates agree extremely well, allowing us to use the constant Al flux model to calculate accumulation rate changes down core in 154-18. These apparent rates and the age of each sample horizon are shown in Figure 5. From Table 2 and Figure 4 it is apparent that the accumulation rates gradually increase towards the ridge crest, but in 154-18 achieve maximum rates of 20 cm/ky. Comparison with the other figures reveal that high accumulation rates result in lower calcite and Th(ex)-230 and Pa(ex)-231 contents, but higher Fe/Al (and Mn/A1) ratios. Therefore the hydrothermal pulses interpreted from Figure 2 have a duration of approximately 1000 years (Fig. 4) during the Holocene. RI (wp.x)
DOI link for The two methods of estimating sediment accumulation rates agree extremely well, allowing us to use the constant Al flux model to calculate accumulation rate changes down core in 154-18. These apparent rates and the age of each sample horizon are shown in Figure 5. From Table 2 and Figure 4 it is apparent that the accumulation rates gradually increase towards the ridge crest, but in 154-18 achieve maximum rates of 20 cm/ky. Comparison with the other figures reveal that high accumulation rates result in lower calcite and Th(ex)-230 and Pa(ex)-231 contents, but higher Fe/Al (and Mn/A1) ratios. Therefore the hydrothermal pulses interpreted from Figure 2 have a duration of approximately 1000 years (Fig. 4) during the Holocene. RI (wp.x)
The two methods of estimating sediment accumulation rates agree extremely well, allowing us to use the constant Al flux model to calculate accumulation rate changes down core in 154-18. These apparent rates and the age of each sample horizon are shown in Figure 5. From Table 2 and Figure 4 it is apparent that the accumulation rates gradually increase towards the ridge crest, but in 154-18 achieve maximum rates of 20 cm/ky. Comparison with the other figures reveal that high accumulation rates result in lower calcite and Th(ex)-230 and Pa(ex)-231 contents, but higher Fe/Al (and Mn/A1) ratios. Therefore the hydrothermal pulses interpreted from Figure 2 have a duration of approximately 1000 years (Fig. 4) during the Holocene. RI (wp.x)
ABSTRACT
In this discussion we will present evidence for the enhanced sedimentary sink of both Th-230 and Pa-231 at the Baja California continental margin and the East Pacific Rise. By the calculation of input flux of these radionuclides it is possible to quantify this removal, and to compare the behaviour of the two actinides. Specific attention is drawn to scavenging by hydrothermal processes.
