Late Pleistocene Interactions of East and West Antarctic Ice-Flow Regimes: Evidence from the McMurdo Ice Shelf

摘要: We present new interpretations of deglaciation in McMurdo Sound and the western Ross Sea, with observationally based reconstructions interactions between East West Antarctic ice at last glacial maximum (LGM), 16000, 12 000, 8000 4000 BP. At LGM, from Mulock Glacier split; one branch turned westward south Island but other rounded before flowing southwest into Sound. This flow regime, constrained by an saddle north Island, is consistent reconstruction Stuiver others (1981a). After grounding-line retreat was most rapid areas greatest water depth, especially along Victoria Land coast. By 000 BP, ice-flow regime changed to through-flowing ice, lesser contributions Koettlitz, Blue Ferrar Glaciers, because former replaced a dome. The modern established ∼4000 Ice derived high elevations on Polar Plateau now stranded Shelf, pattern Transantarctic Mountains erratics support our rounding Minna Bluff all Skelton ablating bluff. They are inconsistent Drewry's (1979) LGM that includes through-flow. model closely approximates results for 000-4000 Ice-sheet modeling holds promise determining whether proceeded sheet largely stagnant, it never approached equilibrium flowline profiles after Shelf grounded, or dynamic kept low active streams extended northward present-day outlet glaciers grounded.