have been blasted from unrelated explosive eruptions,
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, Schoene says,
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, but would still provide a time marker for the surrounding rock. The researchers collected zircon crystals from both the oldest rock layers at the bottom of the traps and the youngest rock at the top to get a complete eruptive timescale.
The researchers’ new dating resulted in uncertainties of 85,000 years or less. These precise measurements yielded an estimate that roughly 80 to 90 percent of the Deccan outpouring took place over 750,000 years, and that the eruptions began before the extinction event.
“Millions of cubic kilometers poured out in a geologic instant,
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,” says coauthor Samuel Bowring,
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, a geologist at MIT. The relatively brief time frame probably meant the climate had less time to recoup between eruptions,
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, Bowring says,
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, amplifying the global effect. The team next plans to date individual eruptions to help reconstruct the volcanism’s exact climate impacts.
The new dating demonstrates the importance of considering the Deccan eruptions alongside the Chicxulub impact, says geoscientist Paul Renne at the University of California,
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, Berkeley. “The outstanding question is if there hadn’t been an asteroid impact,
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, would there have been a mass extinction anyway?”
Renne and his colleagues suggest the asteroid impact and volcanism may not have been entirely unrelated. At the Geological Society of America's annual meeting in October in Vancouver, they proposedthat seismic waves from Chicxulub's impact in

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