Figure 7: Characteristics of trough fill sediments in Royal Bay at core site GC666. | Nature Communications

Figure 7: Characteristics of trough fill sediments in Royal Bay at core site GC666.

From: Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation

Figure 7

(a) Atlas PARASOUND acoustic sub-bottom profile across the GC666 coring site (red bar). The ∼20-m of stratified trough infill onlaps a transparent underlying acoustic facies. At shallow locations the lower units are not represented (for example, red arrow). Core log and properties for gravity core GC666, showing (b) simplified lithology, (c) AMS 14C ages (calibrated yr), (d) shear strength, (e) density, (f) magnetic susceptibility, (g) percentage sand content, (h) total organic carbon and biogenic opal content. (i) Age-depth model for the core showing the change in sedimentation rates at the boundary between lithological units I and II and down-section extrapolations to predict the timing of onset of trough infill, based on correlation to the PARASOUND profiles. Velocity used for correlation 1,500 m s−1. Note that the reported age at 490 cm is an average of two radiocarbon measurements, while the age at 510 cm uses the older of two measurements at that horizon. Core top is assumed modern (conventional 14C age shown).

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