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doi:10.2204/iodp.proc.342.108.2014 Age-depth model and mass accumulation ratesAt Site U1407, we recovered a 300 m thick sequence of Pleistocene to upper Albian nannofossil ooze with varying amounts of clay and foraminifers. Sedimentation rates are relatively high (~1.0–8.7 cm/k.y.) through the Paleogene and a short interval in the mid-Cretaceous (Albian/Cenomanian boundary interval) but low through the Maastrichtian to Turonian (~0.1–0.5 cm/k.y.). Thin Pleistocene and lower Oligocene intervals overlie a middle Eocene through upper Albian succession with significant hiatuses between the lower Eocene and uppermost Paleocene, the lowermost Paleocene and uppermost Maastrichtian, and the uppermost Maastrichtian and Campanian (see “Biostratigraphy”). Biostratigraphic and magnetostratigraphic datums from Hole U1407A (Table T15) were compiled to construct an age-depth model for this site (Fig. F19). A selected set of datums (Table T16) was used to create an age-depth correlation and calculate linear sedimentation rates (LSRs). Total MAR, carbonate MAR (CAR), and noncarbonate MAR (nCAR) were calculated at 0.2 m.y. intervals using a preliminary shipboard splice rather than the sampling splice described in this volume (Table T17; Fig. F30). |
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