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Carbon-14 time scale extended: comparison of chronologies
Science (New York, N.Y.)
|April 7, 1978
Summary
Extended radiocarbon dating using thermal diffusion now reaches 75,000 years. This improved carbon-14 dating method provides a reliable timescale for climate variations and aligns with other chronologies.
Area of Science:
- Paleoclimatology
- Radiometric Dating
- Geochronology
Background:
- Radiocarbon dating is crucial for reconstructing past environments and timelines.
- Previous limitations in radiocarbon dating restricted its effective range.
- Accurate dating is essential for correlating climate events across different regions.
Purpose of the Study:
- To extend the effective dating range of radiocarbon analysis using thermal diffusion.
- To establish a more detailed radiocarbon timescale for climatic variations in northwest Europe.
- To compare and reconcile the new radiocarbon timescale with other existing chronologies.
Main Methods:
- Application of thermal diffusion isotopic enrichment to carbon-14 (¹⁴C) dating.
- Dating of twenty-eight geological samples primarily from northwest Europe.
- Evaluation of dating assumptions and potential contamination sources for reliability assessment.
Main Results:
- The extended radiocarbon dating range reached approximately 75,000 years before present.
- A detailed radiocarbon timescale revealed three early glacial interstades in northwest Europe.
- The new timescale showed agreement with the Camp Century and New Guinea coral chronologies.
Conclusions:
- Thermal diffusion isotopic enrichment significantly enhances the utility of carbon-14 dating.
- The refined radiocarbon timescale provides improved resolution for paleoclimatic studies.
- Reconciling discrepancies with deep-sea chronologies suggests potential correlation adjustments, leading to overall agreement among multiple dating methods.
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