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Sugden, David E; McCulloch, Robert D; Bory, Aloys J-M; Hein, Andrew S (2009): (Table 1) Age determination and isotopic signature of last glacial Patagonian caly/silt. PANGAEA,, Supplement to: Sugden, DE et al. (2009): Influence of Patagonian glaciers on Antarctic dust deposition during the last glacial period. Nature Geoscience, 2, 281-285,

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Ice cores provide a record of changes in dust flux to Antarctica, which is thought to reflect changes in atmospheric circulation and environmental conditions in dust source areas (Forster et al., 2007; Diekmann et al. 2000, doi:10.1016/S0031-0182(00)00138-3; Winckler et al., 2008, doi:10.1126/science.1150595; Reader et al., 1999, doi:10.1029/1999JD900033; Mahowald et al., 1999, doi:10.1029/1999JD900084; Petit et al., 1999, doi:10.1038/20859; 1990, doi:10.1038/343056a0 Delmonte et al., 2009, doi:10.1029/2008GL033382; Lambert et al., 2008, doi:10.1038/nature06763). Isotopic tracers suggest that South America is the dominant source of the dust (Grousset et al., 1992, doi:10.1016/0012-821X(92)90177-W; Basile et al., 1997, doi:10.1016/S0012-821X(96)00255-5; Gaiero et al., 2007, doi:10.1016/j.chemgeo.2006.11.003), but it is unclear what led to the variable deposition of dust at concentrations 20–50 times higher than present in glacial-aged ice (Petit et al., 1990, doi:10.1038/343056a0; Lambert et al., 2008, doi:10.1038/nature06763). Here we characterize the age and composition of Patagonian glacial outwash sediments, to assess the relationship between the Antarctic dust record from Dome C (refs Lambert et al., 2008, doi:10.1038/nature06763; Wolff et al., 2006, doi:10.1038/nature04614) and Patagonian glacial fluctuations (Sugden et al., 2005; McCulloch et al., 2005, doi:10.1111/j.0435-3676.2005.00260.x; Kaplan et al., 2008, doi:10.1016/j.quascirev.2007.09.013) for the past 80,000 years. We show that dust peaks in Antarctica coincide with periods in Patagonia when rivers of glacial meltwater deposited sediment directly onto easily mobilized outwash plains. No dust peaks were noted when the glaciers instead terminated directly into pro-glacial lakes. We thus propose that the variable sediment supply resulting from Patagonian glacial fluctuations may have acted as an on/off switch for Antarctic dust deposition. At the last glacial termination, Patagonian glaciers quickly retreated into lakes, which may help explain why the deglacial decline in Antarctic dust concentrations preceded the main phase of warming, sea-level rise and reduction in Southern Hemisphere sea-ice extent (Wolff et al., 2006, doi:10.1038/nature04614).
Median Latitude: -51.856248 * Median Longitude: -71.331248 * South-bound Latitude: -53.600000 * West-bound Longitude: -72.650000 * North-bound Latitude: -47.283333 * East-bound Longitude: -70.500000
Amarillo * Latitude: -53.416660 * Longitude: -70.983330 * Location: Strait of Magellan, Chile * Device: Sampling by hand (HAND)
Cerro_Ataud * Latitude: -47.283333 * Longitude: -72.650000 * Location: Patagonia * Device: Sampling by hand (HAND)
Esmeralda * Latitude: -47.283333 * Longitude: -72.550000 * Location: Patagonia * Device: Sampling by hand (HAND)
AGE (ka) is cal. ka.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2AGEAgeka BPGeocode
3Age, minimum/youngAge minkaSugden, David EAge, calibratedcal. ka
4Age, maximum/oldAge maxkaSugden, David EAge, calibratedcal. ka
5Strontium 87/Strontium 86 ratio87Sr/86SrSugden, David E
6Strontium 87/Strontium 86, error87Sr/86Sr e±Sugden, David E
7Neodymium 143/Neodymium 144143Nd/144NdSugden, David E
8Neodymium 143/Neodymium 144, error143Nd/144Nd e±Sugden, David E
9epsilon-Neodymium (0)e-Nd(0)Sugden, David E
10epsilon-Neodymium, standard deviatione-Nd std dev±Sugden, David E
11Age, datedAge datedkaSugden, David EAge, 14C AMS
12Age, dated standard deviationAge dated std dev±Sugden, David EAge, 14C AMS
80 data points

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