Fig. 4
From: The marine geological imprint of Antarctic ice shelves
Idealised sedimentary sequence deposited under a retreating ice shelf (modified from refs. 53,147). This full succession is rarely preserved, although the general transition from coarse-grained grounding line (GL) proximal to finer-grained grounding line distal sediments is typical. A ‘collapse facies’ is summarised in the upper panel and can occur anywhere within the ‘sub-ice-shelf’ succession. Black numbered circles (right column) refer to the ‘sediment elements’ shown in Fig. 5. LISA, LISB Larsen A, B ice shelf, PGC Prince Gustav Channel Ice Shelf, BB Barilari Bay, PIG Pine Island Glacier, PB Prydz Bay. Sedimentation rates from refs. 16,23,118; number in parenthesis is distance from GL. Absolute diatom abundance (ADA; millions of valves/gram sediment)17,22,63,64,96. Percentage total organic carbon (TOC)/Nitrogen (N) and total carbon (TC)/N data16,63 together with unpublished data from George VI and Larsen C sub-ice-shelf cores. Berylium-10 (×109 atoms/g) data100,101,102. Diatom assemblage data61,73, foraminiferal assemblage and morphotype data are compiled from refs. 59,72,76,77,78,80,81.
