A new 14C calibration data set for the last deglaciation based on marine varves

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Varved sediments of the tropical Cariaco basin provide a new {sup 14}C calibration data set for the period of deglaciation (10,000 to 14,500 years before present: 10-14.5 cal ka BP). Independent evaluations of the Cariasco Basin calendar and {sup 14}C chronologies were based on the agreement of varve ages with the GISP2 ice core layer chronology for similar high-resolution paleoclimate records, in addition to {sup 14}C age agreement with terrestrial {sup 14}C dates, even during large climatic changes. These assessments indicate that the Cariaco Basin {sup 14}C reservoir age remained stable throughout the Younger Dryas and late Alleroed climatic events ... continued below

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Hughen, K A; Kashgarian, M; Lehman, S J; Overpeck, J T; Peterson, L C & Southon, J R February 22, 1999.

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Varved sediments of the tropical Cariaco basin provide a new {sup 14}C calibration data set for the period of deglaciation (10,000 to 14,500 years before present: 10-14.5 cal ka BP). Independent evaluations of the Cariasco Basin calendar and {sup 14}C chronologies were based on the agreement of varve ages with the GISP2 ice core layer chronology for similar high-resolution paleoclimate records, in addition to {sup 14}C age agreement with terrestrial {sup 14}C dates, even during large climatic changes. These assessments indicate that the Cariaco Basin {sup 14}C reservoir age remained stable throughout the Younger Dryas and late Alleroed climatic events and that the varve and {sup 14}C chronologies provide an accurate alternative to existing calibrations based on coral U/Th dates. The Cariaco Basin calibration generally agrees with coral-derived calibrations but is more continuous and resolves century-scale details of {sup 14}C change not seen in the coral records. {sup 14}C plateaus can be identified at 9.6, 11.4, and 11.7 {sup 14}C ka BP, in addition to a large, sloping plateau during the Younger Dryas ({approximately}10 to 11 {sup 14}C ka BP). Accounting for features such as these is crucial to determining the relative timing and rates of change during abrupt global climate changes of the last deglaciation.

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1.4 Megabytes pages

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  • 16th International Radiocarbon Conference, Groeningen (NL), 06/16/1997--06/20/1997

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  • Report No.: UCRL-JC-133356
  • Report No.: YN010000
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 8542
  • Archival Resource Key: ark:/67531/metadc783305

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  • February 22, 1999

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  • Dec. 3, 2015, 9:30 a.m.

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  • May 6, 2016, 1:44 p.m.

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Hughen, K A; Kashgarian, M; Lehman, S J; Overpeck, J T; Peterson, L C & Southon, J R. A new 14C calibration data set for the last deglaciation based on marine varves, article, February 22, 1999; California. (digital.library.unt.edu/ark:/67531/metadc783305/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.