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Biogenic carbonates in Antarctic marine sequences are critical to constrain reliable chronologies for Late\udQuaternary glacial/interglacial events. Increased amounts of iceberg rafted debris (IBRD) in ice-proximal sediments\udare proxies for climate-induced disruption of the Ross Ice Shelf system. However, ice rafting events seen in deepsea\udsediments from this region lack of age control because they are typically barren of calcareous microfossils. We\uddocument here evidence of carbonate preservation in three out of eight cores collected from the Ross Sea\udcontinental slope (2058-3360 m-depth). AMS-C14 dates from N. pachyderma-rich IBRD range between 28.2ka\udand 17.2ka B.P, and between ~19 ka and 14.4 ka B.P suggesting that deep Ross Sea sediments can retain a reliable\udrecord of pre- and post- LGM events involving massive destabilization of the Ross Ice shelf-sea ice system. These\udevents occurred at a regional scale and were possibly linked to global sea-level rise from meltwater pulse (MWP)\udevents e.g., 19-kyr MWP

antarctica a keystone in a changing world

Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. Santa Barbara, California, U.S.A.--August 26 to September 1, 2007