Publication Date:
2023-06-27
Description:
Biogenic silica accumulation was obtained by analyzing approximately 200 mg of homogenized and freeze dried sediment for each sample. Cleaning, chemical treatment, and measurement followed protocols outlined in (Mortlock & Froelich, 1989, doi:10.1016/0198-0149(89)90092-7). Samples were measured with a UV Vis spectrophotometer at 812 nm wavelength. Full procedural replicates were performed on 163 of the 435 samples yielding an average standard deviation of 0.2 %. Samples were referenced to RICCA VerSpec SiO32- in 1 % NaOH for intercomparison. Opal mass accumulation rates were calculated by multiplying the fraction of opal by dry bulk density and sedimentation rates from Starr et al. (2021, doi:10.1038/s41586-020-03094-7).
Keywords:
361-U1475B; 361-U1475C; 361-U1475E; 361-U1475F; Accumulation rate, biogenic silica; Age model; Age model (Starr et al., 2021); Agulhas Plateau; biogenic silica; Calculated, see abstract; DRILL; Drilling/drill rig; Event label; Exp361; Foraminifera-bound nitrogen isotopes; G. bulloides; G. inflata; Joides Resolution; mid-Pleistocene transition; opal; Opal, biogenic silica; Sample code/label; South African Climates (Agulhas LGM Density Profile); Subtropical Front
Type:
Dataset
Format:
text/tab-separated-values, 1748 data points
