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The end-Permian extinction is resolved to about sixty thousand years

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Burgess, Bowring and Shen published uranium–lead ages on zircons from ash beds through the boundary interval at Meishan, using chemical-abrasion isotope-dilution mass spectrometry to place the Permian–Triassic boundary at 251.902 ± 0.024 million years and to constrain the main marine extinction pulse to roughly sixty thousand years, with an uncertainty of comparable size. The scientific content of this result is not the date but the duration. A biotic collapse spread over millions of years can be explained by ordinary environmental change; one compressed into tens of thousands of years requires a forcing fast enough to outrun the ocean and the carbon cycle, and it is that constraint which makes the Siberian Traps degassing hypothesis compelling rather than merely coincidental.

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Assembled from 30 blocks · 1 evidence · 18 related

  1. Story
  2. Burgess, Bowring and Shen published uranium–lead ages on zircons from ash beds through the boundary interval at Meishan, using chemical-abrasion isotope-dilution mass spectrometry to place the Permian–Triassic boundary at 251.902 ± 0.024 million years and to constrain the main marine extinction pulse to roughly sixty thousand years, with an uncertainty of comparable size. The scientific content of this result is not the date but the duration. A biotic collapse spread over millions of years can be explained by ordinary environmental change; one compressed into tens of thousands of years requires a forcing fast enough to outrun the ocean and the carbon cycle, and it is that constraint which makes the Siberian Traps degassing hypothesis compelling rather than merely coincidental.
  3. Knowledge
  4. Radiometric dating
  5. Zircon as a geochronometer
  6. Meishan GSSP, Changxing, Zhejiang
  7. Siberian Traps large igneous province
  8. The end-Permian extinction is resolved to about sixty thousand years
  9. Connections
  10. Meishan GSSP, Changxing, Zhejiang
  11. Radiometric dating
  12. Zircon as a geochronometer
  13. Siberian Traps large igneous province
  14. The end-Permian mass extinction
  15. Global Boundary Stratotype Section and Point
  16. The end-Permian mass extinction
  17. The end-Permian extinction is resolved to about sixty thousand years
  18. Mass extinction
  19. Zircon as a geochronometer
  20. Molecular clock dating
  21. The end-Permian mass extinction
  22. Sulfur mass-independent fractionation is proposed as an atmospheric oxygen proxy
  23. The K–Pg boundary is dated to 66.043 ± 0.043 Ma
  24. The end-Permian extinction is resolved to about sixty thousand years
  25. Radiometric dating
  26. The end-Permian extinction is resolved to about sixty thousand years
  27. The end-Permian mass extinction
  28. The end-Permian extinction is resolved to about sixty thousand years
  29. Evidence
  30. Supports the Permian–Triassic boundary age of 251.902 ± 0.024 Ma from Meishan zircons and the constraint of the main extinction pulse to roughly sixty thousand years. V55 verification basis: this session had no network access to any source — WebFetch was egress-blocked and the WebSearch budget was exhausted — so the cited work was not retrieved and its pagination was not re-checked. Volume and page range are quoted from standing knowledge and were not re-checked.
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