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doi:10.2204/iodp.proc.303306.106.2006 Composite sectionCores were depth-shifted on the basis of MS, which proved to be the most useful parameter for correlating among holes at Site U1306. The high-amplitude variations in MS in the four holes drilled at Site U1306 permitted construction of a complete composite section for the last 2 m.y. Features in MS are well aligned among holes, providing a continuous stratigraphic sequence to ~337 mcd (e.g., Fig. F22). The offsets and composite depths are listed in Table T20, and the sections of core used for the splice are identified in Table T21. We avoided using the first (top) section of each core because it was often disturbed. Below ~287 mcd, cores were recovered in two holes only but the section is complete, with the possible exception of a tenuous tie between Cores 303-U1306A-33H and 303-U1306B-33H near the base of the record (Fig. F22). A growth factor (GF) of 1.08 was derived by linear regression for all holes at Site U1306, indicating an 8% increase in mcd relative to mbsf (Fig. F23). We used this value of GF to calculate corrected meters composite depth (cmcd) presented in Table T20 to aid in the calculation of mass accumulation rates. We calculated sedimentation rates using paleomagnetic and biostratigraphic datums (Table T22). Linear regression provides a mean sedimentation rate of 15.6 cm/k.y. for the entire section cored at Site U1306 (Fig. F24). Interval sedimentation rates were calculated using paleomagnetic data only and varied between 12.4 and 19.3 cm/k.y. (Fig. F24). In summary, stratigraphic correlation at Site U1306 provides a verifiably complete section for sediments deposited during the last 2 m.y. at relatively high rates of accumulation. |
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