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• W245568827 abstract "Since Sugden and John’s (1973) paper regarding the glacier fluctuations in the South Shetland Islands, it is generally accepted that the first Holocene marine transgression of this archipelago occurred at least by 9540 ± 235 cal yrs BP (del Valle et al. 2007, Hall 2010). All radiocarbon ages presented here are calibrated with Calib611 software (Stuiver and Reimer 1993) using the SHCal04 calibration curve and Bjork’s et al. (1991) reservoir age correction of Bahia Esperanza (1.160 ± 51 yrs, ΔR: 829 yrs). This age is very important, since it provides the minimum on land obtained age of the end of the Last Glacial Maximum (LGM) and start of the Holocene in this Antarctic sector. The first profile that affords this critical age was performed by Sugden and John (1973) on the southern coast of Potter Cove (Fig. 1). Their age was obtained from a dark silty horizon, which incorporates shell fragments (laternula sp.), located 2.7 m below a 6 m asl marine terrace. In the same outcrop, a second age of 7370 ± 99 yrs BP was obtained by the same authors on a seaweed horizon located 1.5 m below the top of the same terrace (Fig. 2). Here we present our own chronological results (Fig. 3) obtained at this key site, which put in doubt the earliest Holocene radiocarbon age obtained by Sugden and John (1973). To ensure good replication, or even to obtain an older age than Sugden and John (1973), we excavated a new 3.8 m deep section in the 6 m marine terrace (62o 14’ 20.24” S, 58o 40’ 15.75” W). This terrace is attached to an old dam located about 100 m west of the Argentine Carlini Station. We penetrated the permafrost table reaching 1.1 m deeper (3.5 m) than any previous work. The lower 2.0 m of this new section are interpreted as marine transgressive deposits, whereas the upper 1.8 m corresponds to a glacier-transgressive, partially deformed, marine near-shore deposit, covered by a lodgment till that include up to 0.8 m large faceted and striated blocks. Our description and interpretation agree mainly with those of other authors (Sugden and John 1973, del Valle et al. 2007), but differs with them in assigning a much shorter time interval to the deposition of the marine sediments, with a much larger accumulation rate (6.4 mm/yr, Fig. 3). Four additional samples, collected between 0.7 and 3.5 m depth, were dated and added (Fig. 3) to the previously dated samples obtained: two by Sugden and John (1973), two by del Valle et al. (2007), and four by Watcham (2010). All these radiocarbon ages were performed on different organisms: marine shells of laternula sp., penguin bones, and seaweed. The agreement of the obtained ages with the accumulation rate follows the graph of Figure 3. The only sample age, that appears to be an outlier and disagrees markedly with this curve (Fig. 3), is the 9.540 yrs BP oldest minimum age obtained by Sugden and John (1973). Figure 1. Location map of Potter Cove" @default.
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• W245568827 date "2014-06-01" @default.
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• W245568827 title "The age of the first Holocene marine transgression in Potter Cove, Isla 25 de Mayo (King George Island), South Shetland Islands" @default.
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