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Full-Text Articles in Life Sciences
Short Organic Carbon Turnover Time And Narrow 14C Age Spectra In Early Holocene Wetland Paleosols, Lael Vetter, Brad E. Rosenheim, Alvaro Fernandez, Torbjörn E. Törnqvist
Short Organic Carbon Turnover Time And Narrow 14C Age Spectra In Early Holocene Wetland Paleosols, Lael Vetter, Brad E. Rosenheim, Alvaro Fernandez, Torbjörn E. Törnqvist
Marine Science Faculty Publications
Paleosols contain information about the rates of soil organic carbon turnover when the soil was actively forming. However, this temporal information is often difficult to interpret without tight stratigraphic control on the age of the paleosol. Here we apply ramped pyrolysis/oxidation (Ramped PyrOx) 14C analyses to evaluate age spectra of transgressive early Holocene paleosols from the Mississippi Delta in southeastern Louisiana, USA. We find 14C age spectra from soil organic matter (SOM) in both paleosols and overlying basal peats that represent variability in age that is close to, or only slightly greater than, analytical uncertainty of 14C …
Sub-Ice Shelf Sediment Geochronology Utilizing Novel Radiocarbon Methodology For Highly Detrital Sediments, C. Subt, H. I. Yoon, K. C. Yoo, J. I. Lee, A. Leventer, Eugene W. Domack, Brad E. Rosenheim
Sub-Ice Shelf Sediment Geochronology Utilizing Novel Radiocarbon Methodology For Highly Detrital Sediments, C. Subt, H. I. Yoon, K. C. Yoo, J. I. Lee, A. Leventer, Eugene W. Domack, Brad E. Rosenheim
Marine Science Faculty Publications
Sub-ice shelf sediments near Larsen C ice shelf (LIS-C) show fine-scale rhythmic laminations that could provide a near-continuous seasonal-resolution record of regional ice mass changes. Despite the great potential of these sediments, a dependable Late Quaternary chronology is difficult to generate, rendering the record incomplete. As with many marginal Antarctic sediments, in the absence of preserved carbonate microfossils, the reliability of radiocarbon chronologies depends on presence of high proportions of autochthonous organic carbon with minimized detrital organic carbon. Consequently, acid insoluble organic (AIO) 14C dating works best where high productivity drives high sediment accumulation rates, but can be problematic …