Sediment Cores from White Pond, South Carolina, contain a Platinum Anomaly, Pyrogenic Carbon Peak, and Coprophilous Spore Decline at 12.8 ka.
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A widespread platinum (Pt) anomaly was recently documented in Greenland ice and 11 North American sedimentary sequences at the onset of the Younger Dryas (YD) event (~12,800calyr BP), consistent with the YD Impact Hypothesis. We report high-resolution analyses of a 1-meter section of a lake core from White Pond, South Carolina, USA. After developing a Bayesian age-depth model that brackets the late Pleistocene through early Holocene, we analyzed and quantified the following: (1) Pt and palladium (Pd) abundance, (2) geochemistry of 58 elements, (3) coprophilous spores, (4) sedimentary organic matter (OC and sedaDNA), (5) stable isotopes of C (13C) and N (15N), (6) soot, (7) aciniform carbon, (8) cryptotephra, (9) mercury (Hg), and (10) magnetic susceptibility. We identified large Pt and Pt/Pd anomalies within a 2-cm section dated to the YD onset (12,78558calyr BP). These anomalies precede a decline in coprophilous spores and correlate with an abrupt peak in soot and C/OC ratios, indicative of large-scale regional biomass burning. We also observed a relatively large excursion in 15N values, indicating rapid climatic and environmental/hydrological changes at the YD onset. Our results are consistent with the YD Impact Hypothesis and impact-related environmental and ecological changes.
author list (cited authors)
Moore, C. R., Brooks, M. J., Goodyear, A. C., Ferguson, T. A., Perrotti, A. G., Mitra, S., ... Pyne-O'Donnell, S.
complete list of authors
Moore, Christopher R||Brooks, Mark J||Goodyear, Albert C||Ferguson, Terry A||Perrotti, Angelina G||Mitra, Siddhartha||Listecki, Ashlyn M||King, Bailey C||Mallinson, David J||Lane, Chad S||Kapp, Joshua D||West, Allen||Carlson, David L||Wolbach, Wendy S||Them, Theodore R||Harris, M Scott||Pyne-O'Donnell, Sean