Cited by 542Geological and Geochemical AnalysisPaleontology and Stratigraphy of FossilsAstro and Planetary Science

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U-Pb constraints on pulsed eruption of the Deccan Traps across the end-Cretaceous mass extinction

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Abstract

Two timelines for extinction: The Cretaceous-Paleogene extinction that wiped out the nonavian dinosaurs 66 million years ago was correlated with two extreme events: The Chicxulub impact occurred at roughly the same time that massive amounts of lava were erupting from the Deccan Traps (see the Perspective by Burgess). Sprain et al. used argon-argon dating of the volcanic ash from the Deccan Traps to argue that a steady eruption of the flood basalts mostly occurred after the Chicxulub impact. Schoene et al. used uranium-lead dating of zircons from ash beds and concluded that four large magmatic pulses occurred during the flood basalt eruption, the first of which preceded the Chicxulub impact. Whatever the correct ordering of events, better constraints on the timing and rates of the eruption will help elucidate how volcanic gas influenced climate. Science , this issue p. 866 , p. 862 ; see also p. 815

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TL;DR

U-Pb zircon geochronology shows the Deccan Traps erupted in four high-volume pulses, each ≤100 kyr, separated by quiescence, with the Poladpur pulse beginning tens of kyr before the K-Pg extinction and Chicxulub impact. The results support extinction models incorporating both Deccan volcanism and the bolide impact as drivers of end-Cretaceous environmental deterioration.

Key findings

  • The Deccan Traps erupted in four high-volume events, each lasting ≤100 kyr: first, lowermost seven formations at ~66.3–66.15 Ma; second, Poladpur Fm at ~66.1–66.0 Ma; third, Ambenali Fm at ~65.9–65.8 Ma; fourth, uppermost Mahabaleshwar Fm (text states ~65.6–66.5 Ma, apparently inverted).
  • MCMC outputs give a ~90% probability that the Poladpur Fm eruption pulse began tens of kyr before the K-Pg mass extinction; the K-Pg boundary is estimated at 66.016 ± 0.050 Ma (95% C.I., internal uncertainties only).
  • Eruption rates: global volcanic flux is 3–4 km³/yr; Deccan events imply an average doubling of global volcanic activity for ≤100 kyr, with periods >5–10× the global average. U-Pb geochronology permits rates >1000 km³/yr, requiring hiatuses of 100s–1000s of years within resolved pulses.
  • Proxy correlation: initial warming at ~66.3 Ma and carbonate dissolution occurred during the first Deccan pulse; cooling began before and continued through Poladpur initiation; a second Os isotope downturn synchronous with Poladpur is also consistent with increased weathering of a more extensive Deccan basalt pile.

Methods

  • U-Pb zircon geochronology by ID-TIMS on 141 sampled redboles and coarse-grained basalts; 23 redboles and one basalt yielded sufficient zircon (≥5 crystals), giving 24 dated horizons. Twenty-one horizons came from five Western Ghats sections covering the upper four Deccan formations; three spanned the lower five formations.
  • Bayesian statistics and a Markov Chain Monte Carlo model imposed stratigraphic superposition on U-Pb zircon dates to build a composite age model, then converted outputs into probabilistic volumetric eruption rates using the Richards et al. volume model.
  • Results were compared with a published U-Pb K-Pg boundary date and with benthic foraminifera δ¹⁸O and marine carbonate Os isotope proxy records.

Limitations

  • Stated: the adopted volume model carries nontrivial uncertainties; the mass and age of submerged, inaccessible Deccan basalt off India’s western shore are unconstrained and considered intractable, so all eruption rates are likely minimum estimates, and it cannot be assessed whether the offshore component erupted during the same intervals.
  • Stated: comparison with ⁴⁰Ar/³⁹Ar geochronology is not currently possible at the necessary precision because of systematic bias between dating methods; refined age accuracy depends on proper stratigraphic placement, independent of exact stratigraphic heights.
  • Evident from the text: the fourth pulse age range as printed (~65.6–66.5 Ma) is internally inconsistent with the preceding Ambenali pulse, and some figure/reference text in the provided version is garbled.

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Registry

Crossref · 10.1126/science.aau2422

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Cites

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Research works printed but not linked: 11

  1. 10.1038/ngeo2588 · DOI · Paper page
  2. S. Khadri, K. Subbarao, P. Hooper, J. Walsh, Stratigraphy of Thakurvadi formation, western Deccan basalt province, India. Geol. Soc. India Mem. 10, 281 (1988).
  3. 10.1029/2006jb004635 · DOI · Paper page
  4. 10.1016/j.epsl.2016.09.035 · DOI
  5. 10.1038/ncomms15596 · DOI
  6. 10.1016/0012-821x(84)90114-6 · DOI
  7. 10.1016/0012-821x(84)90114-6 · DOI
  8. 10.1103/physrevc.4.1889 · DOI
  9. 10.1103/physrevc.4.1889 · DOI
  10. 10.1103/physrevc.4.1889 · DOI
  11. 10.1016/0012-821x(84)90114-6 · DOI

Cited by

Items 201–300 of 542

Metadata

Authors
Schoene, B., Eddy, M. P., Samperton, K. M., Keller, C. B., Keller, G., Adatte, T., & Khadri, S. F. R.
Affiliations
  • Princeton University (US)
  • Lawrence Livermore National Laboratory (US)
  • Berkeley Geochronology Center (US)
  • University of Lausanne (CH)
  • Sant Gadge Baba Amravati University (IN)
Corresponding author
Schoene, Blair
Venue
Science
Published
2019-02-22
Volume
363
Issue
6429
Pages
862-866
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2915414273
Cited by
542
References
102
Citations by year
2026: 56 · 2025: 56 · 2024: 68 · 2023: 86 · 2022: 77 · 2021: 84 · 2020: 80 · 2019: 34
FWCI
41.05
Type
journal article
Language
en
Open access
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
Funders
NSF Office of the Director (EAR-1454430)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Astro and Planetary Science
Keywords
Deccan Traps, continental flood basalts, end-Cretaceous mass extinction, Cretaceous-Paleogene boundary, Chicxulub impact, eruption rate, zircon U-Pb geochronology, Cretaceous-Paleogene transition

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