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Sub-ice shelf sediment geochronology utilizing novel radiocarbon methodology for highly detrital sediments

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Title
Sub-ice shelf sediment geochronology utilizing novel radiocarbon methodology for highly detrital sediments
Other Titles
쇄설 빈도가 높은 퇴적물에 대한 독창적인 방사선 탄소 방법을 이용한 빙붕 아래 퇴적물 지질 연대
Authors
C. Subt
B. E. Rosenheim
E. W. Domack
A. Leventer
Lee, Jae Il
Yoo, Kyu-Cheul
Yoon, Ho Il
Subject
Geochemistry & Geophysics
Keywords
Larsen C ice shelf; Ramped pyrolysis analysis; Sub-ice shelf sediment
Issue Date
2017
Citation
C. Subt, et al. 2017. "Sub-ice shelf sediment geochronology utilizing novel radiocarbon methodology for highly detrital sediments". GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 18(4): 1404-1418.
Abstract
Sub-ice shelf sediments near Larsen C ice shelf (LIS-C) show ?ne-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 dif?cult 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 in condensed sequences with high proportions of detrital organic carbon. Ramped PyrOx 14C dating has progressively been shown to improve upon AIO 14C dates, to the point of matching foraminiferal carbonate 14C dates, through differential thermochemical degradation of organic components within samples. But in highly detrital sediments, proportions of contemporaneously deposited material are too low to fully separate autochthonous organic carbon from detrital carbon in samples large enough to 14C date. We introduce two modi?cations of the Ramped PyrOx 14C approach applied to highly detrital sediments near LIS-C to maximize accuracy by utilizing ultra-small fractions of the highly detrital AIO material. With minimization of the uncertainty cost, these techniques allow us to generate chronologies for cores that would otherwise go undated, pushing the limits ofradiocarbondating to regions and facies with highproportions of preaged detritus. Wider use of these techniques will enable more coordinated a prioricoring efforts to constrain regional glacial responses to rapid warming where sediments had previously been thought toodif?cult to date.
URI
http://repository.kopri.re.kr/handle/201206/6101
DOI
http://dx.doi.org/10.1002/2016GC006578
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