Dating deep-lake sediments by using amino acid racemization in fossil ostracodes

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The long-term rate of racemization for amino acids preserved in fossil ostracode shells was determined by using independently dated sediment cores from five deep lakes. The racemization rates for aspartic and glutamic acids in the common ostracode genus Candona were calibrated for the past 100 k.y., providing the basis for an age equation with a realistic age uncertainty of ∼±20%. The new age equation can be applied to other hypolimnic settings because the temperature below the thermocline of deep lakes from middle- and high-latitude regions can reasonably be assumed to remain close to 4 °C. The sample size required for analysis is an order of magnitude less than for 14C dating and presents new opportunities to date deposits that are organic-matter poor or those with large 14C reservoir effects.

Original languageEnglish (US)
Pages (from-to)1049-1052
Number of pages4
JournalGeology
Volume31
Issue number12
DOIs
StatePublished - Dec 2003

Fingerprint

racemization
ostracod
lacustrine deposit
amino acid
fossil
lake
thermocline
sediment core
shell
organic matter
acid
dating
temperature
rate

Keywords

  • Amino acid racemization
  • Deep-lake sediment
  • Ostracodes
  • Quaternary geochronology

ASJC Scopus subject areas

  • Geology

Cite this

Dating deep-lake sediments by using amino acid racemization in fossil ostracodes. / Kaufman, Darrell S.

In: Geology, Vol. 31, No. 12, 12.2003, p. 1049-1052.

Research output: Contribution to journalArticle

@article{2969e564f9a844ea837e501262a624ad,
title = "Dating deep-lake sediments by using amino acid racemization in fossil ostracodes",
abstract = "The long-term rate of racemization for amino acids preserved in fossil ostracode shells was determined by using independently dated sediment cores from five deep lakes. The racemization rates for aspartic and glutamic acids in the common ostracode genus Candona were calibrated for the past 100 k.y., providing the basis for an age equation with a realistic age uncertainty of ∼±20{\%}. The new age equation can be applied to other hypolimnic settings because the temperature below the thermocline of deep lakes from middle- and high-latitude regions can reasonably be assumed to remain close to 4 °C. The sample size required for analysis is an order of magnitude less than for 14C dating and presents new opportunities to date deposits that are organic-matter poor or those with large 14C reservoir effects.",
keywords = "Amino acid racemization, Deep-lake sediment, Ostracodes, Quaternary geochronology",
author = "Kaufman, {Darrell S}",
year = "2003",
month = "12",
doi = "10.1130/G20004.1",
language = "English (US)",
volume = "31",
pages = "1049--1052",
journal = "Geology",
issn = "0091-7613",
publisher = "Geological Society of America",
number = "12",

}

TY - JOUR

T1 - Dating deep-lake sediments by using amino acid racemization in fossil ostracodes

AU - Kaufman, Darrell S

PY - 2003/12

Y1 - 2003/12

N2 - The long-term rate of racemization for amino acids preserved in fossil ostracode shells was determined by using independently dated sediment cores from five deep lakes. The racemization rates for aspartic and glutamic acids in the common ostracode genus Candona were calibrated for the past 100 k.y., providing the basis for an age equation with a realistic age uncertainty of ∼±20%. The new age equation can be applied to other hypolimnic settings because the temperature below the thermocline of deep lakes from middle- and high-latitude regions can reasonably be assumed to remain close to 4 °C. The sample size required for analysis is an order of magnitude less than for 14C dating and presents new opportunities to date deposits that are organic-matter poor or those with large 14C reservoir effects.

AB - The long-term rate of racemization for amino acids preserved in fossil ostracode shells was determined by using independently dated sediment cores from five deep lakes. The racemization rates for aspartic and glutamic acids in the common ostracode genus Candona were calibrated for the past 100 k.y., providing the basis for an age equation with a realistic age uncertainty of ∼±20%. The new age equation can be applied to other hypolimnic settings because the temperature below the thermocline of deep lakes from middle- and high-latitude regions can reasonably be assumed to remain close to 4 °C. The sample size required for analysis is an order of magnitude less than for 14C dating and presents new opportunities to date deposits that are organic-matter poor or those with large 14C reservoir effects.

KW - Amino acid racemization

KW - Deep-lake sediment

KW - Ostracodes

KW - Quaternary geochronology

UR - http://www.scopus.com/inward/record.url?scp=1642481196&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=1642481196&partnerID=8YFLogxK

U2 - 10.1130/G20004.1

DO - 10.1130/G20004.1

M3 - Article

AN - SCOPUS:1642481196

VL - 31

SP - 1049

EP - 1052

JO - Geology

JF - Geology

SN - 0091-7613

IS - 12

ER -