Fig. 4: Sediment record.
From: A West Antarctic grounding-zone environment shaped by episodic water flow
Sediment core recovered from the base of the channel shows sediment deposition that is dominated by distinct events. a, Visible image of split core. b, Single CT slice with dashed line showing location of density profile shown in d. c, Provenance indicators (neodymium isotope ratio εNd in black, and 87Sr/86Sr in grey) with dashed lines denoting εNd values from Whillans Grounding Zone (εWGZ), Whillans Ice Stream (εWIS), upstream Kamb Ice Stream (εKIS) and J9 borehole (εJ9) (Supplementary Table 6). Note, εNd and 87Sr/86Sr are estimated from single sample measurements. εNd error bars are two standard deviations calculated from the external reproducibility of the JNdi standard, and 87Sr/86Sr error bars, estimated from the internal measurement error, are smaller than the symbol size. d, Sand (light brown), silt (light blue) and clay (dark brown) grain-size percentages overlain with density profile (blue line).
