Numerical dating of a Late Quaternary spit-shoreline complex at the northern end of Silver Lake playa, Mojave Desert, California: A comparison of the applicability of radiocarbon, luminescence, terrestrial cosmogenic nuclide, electron spin resonance, U-series and amino acid racemization methods

Lewis A. Owen, Jordon Bright, Robert C. Finkel, Manoj K. Jaiswal, Darrell S Kaufman, Shannon Mahan, Ulrich Radtke, Joan S. Schneider, Warren Sharp, Ashok K. Singhvi, Claude N. Warren

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

A Late Quaternary spit-shoreline complex on the northern shore of Pleistocene Lake Mojave of southeastern California, USA was studied with the goal of comparing accelerator mass spectrometry (AMS) radiocarbon, luminescence, electron spin resonance (ESR), terrestrial cosmogenic radionuclide (TCN) surface exposure, amino acid racemization (AAR) and U-series dating methods. The pattern of ages obtained by the different methods illustrates the complexity of processes acting in the lakeshore environment and highlights the utility of a multi-method approach. TCN surface exposure ages (mostly ∼20-30 ka) record the initial erosion of shoreline benches, whereas radiocarbon ages on shells (determined in this and previous studies) within the spit, supported by AAR data, record its construction at fluctuating lake levels from ∼16 to 10 ka. Luminescence ages on spit sediment (∼6-7 ka) and ESR ages on spit shells (∼4 ka) are anomalously young relative to radiocarbon ages of shells within the same deposits. The significance of the surprisingly young luminescence ages is not clear. The younger ESR ages could be a consequence of post-mortem enrichment of U in the shells. High concentrations of detrital thorium in tufa coating spit gravels inhibited the use of single-sample U-series dating. Detailed comparisons such as this provide one of the few means of assessing the accuracy of Quaternary dating techniques. More such comparisons are needed.

Original languageEnglish (US)
Pages (from-to)87-110
Number of pages24
JournalQuaternary International
Volume166
Issue number1
DOIs
StatePublished - May 2007

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racemization
playa
spit
electron spin resonance
luminescence
shoreline
silver
amino acid
desert
shell
cosmogenic radionuclide
tufa
dating method
comparison
dating
method
thorium
accelerator mass spectrometry
lake level
coating

ASJC Scopus subject areas

  • Earth-Surface Processes

Cite this

Numerical dating of a Late Quaternary spit-shoreline complex at the northern end of Silver Lake playa, Mojave Desert, California : A comparison of the applicability of radiocarbon, luminescence, terrestrial cosmogenic nuclide, electron spin resonance, U-series and amino acid racemization methods. / Owen, Lewis A.; Bright, Jordon; Finkel, Robert C.; Jaiswal, Manoj K.; Kaufman, Darrell S; Mahan, Shannon; Radtke, Ulrich; Schneider, Joan S.; Sharp, Warren; Singhvi, Ashok K.; Warren, Claude N.

In: Quaternary International, Vol. 166, No. 1, 05.2007, p. 87-110.

Research output: Contribution to journalArticle

Owen, Lewis A. ; Bright, Jordon ; Finkel, Robert C. ; Jaiswal, Manoj K. ; Kaufman, Darrell S ; Mahan, Shannon ; Radtke, Ulrich ; Schneider, Joan S. ; Sharp, Warren ; Singhvi, Ashok K. ; Warren, Claude N. / Numerical dating of a Late Quaternary spit-shoreline complex at the northern end of Silver Lake playa, Mojave Desert, California : A comparison of the applicability of radiocarbon, luminescence, terrestrial cosmogenic nuclide, electron spin resonance, U-series and amino acid racemization methods. In: Quaternary International. 2007 ; Vol. 166, No. 1. pp. 87-110.
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abstract = "A Late Quaternary spit-shoreline complex on the northern shore of Pleistocene Lake Mojave of southeastern California, USA was studied with the goal of comparing accelerator mass spectrometry (AMS) radiocarbon, luminescence, electron spin resonance (ESR), terrestrial cosmogenic radionuclide (TCN) surface exposure, amino acid racemization (AAR) and U-series dating methods. The pattern of ages obtained by the different methods illustrates the complexity of processes acting in the lakeshore environment and highlights the utility of a multi-method approach. TCN surface exposure ages (mostly ∼20-30 ka) record the initial erosion of shoreline benches, whereas radiocarbon ages on shells (determined in this and previous studies) within the spit, supported by AAR data, record its construction at fluctuating lake levels from ∼16 to 10 ka. Luminescence ages on spit sediment (∼6-7 ka) and ESR ages on spit shells (∼4 ka) are anomalously young relative to radiocarbon ages of shells within the same deposits. The significance of the surprisingly young luminescence ages is not clear. The younger ESR ages could be a consequence of post-mortem enrichment of U in the shells. High concentrations of detrital thorium in tufa coating spit gravels inhibited the use of single-sample U-series dating. Detailed comparisons such as this provide one of the few means of assessing the accuracy of Quaternary dating techniques. More such comparisons are needed.",
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