Site U1506

The Late Miocene‐Early Pliocene Biogenic Bloom: An Integrated Study in the Tasman Sea

“…Sediments consist of white to greyish‐white ooze and chalk with a carbonate content ranging between 88% and 95%, containing some black opaque minerals identified as pyrite. Deposition was in a lower bathyal environment, similar to that of present‐day (Sutherland et al., 2019, 2022).…”

“…The sedimentary sequence recovered at Site U1506 was divided into units and subunits based on lithology. Samples analyzed in this work come from Subunit Ia, the uppermost 258 m of “homogenous white nannofossil ooze/chalk with foraminifera” (Sutherland et al., 2019). Because of time and goals, this sequence was recovered by rotary core barrel (RCB) drilling methods.…”

“…The depth scale adopted in this work is meters CSF‐A (https://www.iodp.org/policies-and-guidelines), which assumes all cores (even if incomplete) tie to the top of each drilled interval (Sutherland et al., 2019). The top 48 m (Cores 1R through 6R) are variably soupy and disturbed by drilling, whereas the underlying 195 m (Cores 8R through 26R) are moderately biscuited and fractured.…”

“…(2019), and allows for an implementation of the tuned age model from Cores U1506‐10R to 25R (Figure 4; Table ). We refined the age model for Site U1506 for the sediment interval spanning from 7.4 to 4.2 Ma based on orbital tuning of the Natural Gamma Radiation (NGR) and color reflectance shipboard data (Sutherland et al., 2019) to the daily insolation at 65°N on 21st June (summer) from the Laskar 2004 orbital solution (Laskar et al., 2004).…”

“…The area is a target for late Neogene paleoceanographic studies (e.g., Grant & Dickens, 2002; Kennett & Von der Borch, 1986; Sutherland et al., 2022) due to its relatively shallow water depth above the CCD and its position under the return flow of the South Pacific Gyre. Recent work at Site U1506 shows that linear sedimentation rates (LSRs) peaked between 8 and 3 Ma (Sutherland et al., 2019, 2022).…”