Date:

In death of dinosaurs, it was all about the asteroid – not volcanoes

Volcanic activity did not play a direct role in the mass extinction event that killed the dinosaurs, according to an international, Yale-led team of researchers. It was all about the asteroid.

In a break from a number of other recent studies, Yale assistant professor of geology & geophysics Pincelli Hull and her colleagues argue in a new research paper in Science that environmental impacts from massive volcanic eruptions in India in the region known as the Deccan Traps happened well before the Cretaceous-Paleogene extinction event 66 million years ago and therefore did not contribute to the mass extinction.

- Advertisement -

Most scientists acknowledge that the mass extinction event, also known as K-Pg, occurred after an asteroid slammed into Earth. Some researchers also have focused on the role of volcanoes in K-Pg due to indications that volcanic activity happened around the same time.

“Volcanoes can drive mass extinctions because they release lots of gases, like SO2 and CO2, that can alter the climate and acidify the world,” said Hull, lead author of the new study. “But recent work has focused on the timing of lava eruption rather than gas release.”

To pinpoint the timing of volcanic gas emission, Hull and her colleagues compared global temperature change and the carbon isotopes (an isotope is an atom with a higher or lower number of neutrons than normal) from marine fossils with models of the climatic effect of CO2 release. They concluded that most of the gas release happened well before the asteroid impact — and that the asteroid was the sole driver of extinction.

“Volcanic activity in the late Cretaceous caused a gradual global warming event of about two degrees, but not mass extinction,” said former Yale researcher Michael Henehan, who compiled the temperature records for the study. “A number of species moved toward the North and South poles but moved back well before the asteroid impact.”

- Advertisement -

Added Hull, “A lot of people have speculated that volcanoes mattered to K-Pg, and we’re saying, ‘No, they didn’t.'”

Recent work on the Deccan Traps, in India, has also pointed to massive eruptions in the immediate aftermath of the K-Pg mass extinction. These results have puzzled scientists because there is no warming event to match. The new study suggests an answer to this puzzle, as well.

“The K-Pg extinction was a mass extinction and this profoundly altered the global carbon cycle,” said Yale postdoctoral associate Donald Penman, the study’s modeler. “Our results show that these changes would allow the ocean to absorb an enormous amount of CO2 on long time scales — perhaps hiding the warming effects of volcanism in the aftermath of the event.”

YALE UNIVERSITY

Header Image Credit : Pixabay

- Advertisement -

Stay Updated: Follow us on iOS, Android, Google News, Facebook, Instagram, Twitter, Threads, TikTok, LinkedIn, and our newsletter

spot_img
Mark Milligan
Mark Milligan
Mark Milligan is multi-award-winning journalist and the Managing Editor at HeritageDaily. His background is in archaeology and computer science, having written over 8,000 articles across several online publications. Mark is a member of the Association of British Science Writers (ABSW), the World Federation of Science Journalists, and in 2023 was the recipient of the British Citizen Award for Education, the BCA Medal of Honour, and the UK Prime Minister's Points of Light Award.
spot_img
spot_img
spot_img

Mobile Application

spot_img

Related Articles

The mystery of a 1940’s Ford Woody discovered on USS Yorktown shipwreck

During a recent expedition aboard NOAA Ship Okeanos Explorer for the Papahānaumokuākea ROV and Mapping project, NOAA Ocean Exploration and its partners discovered a 1940s Ford Woody on the wreck of the USS Yorktown.

Roman phallus found at frontier fortress

Excavations at Vindolanda near Hadrian’s Wall have unearthed a miniature phallus pendant.

Ancient underground chamber discovery in Cnoc Ard

A construction project in Cnoc Ard (Knockaird) on the Isle of Lewis has revealed a stone-built underground chamber, later identified by archaeologists as a Late Iron Age souterrain.

Caral burial unearthed at Áspero: Elite woman found remarkably preserved

Archaeologists from the Caral Archaeological Zone (ZAC), led by Dr. Ruth Shady Solís from the Ministry of Culture, have discovered a well-preserved burial at the Áspero archaeological site in Barranca Province, Peru.

Mesolithic figurine found in Damjili Cave offers new clues to Neolithic transition

A stone figurine discovered in Damjili Cave, western Azerbaijan, is providing archaeologists with new insights into the cultural and symbolic transition from the Mesolithic to Neolithic in the South Caucasus.

Bite marks confirm gladiators fought lions at York

A recent study published in PLOS One has identified bite marks on human remains excavated from Driffield Terrace, a Roman cemetery on the outskirts of York, England.

Treasures of the Alanian culture found in Alkhan-Kala necropolis

Archaeologists have discovered an intact burial mound containing the tomb of an Alanian elite during excavations at Alkhan-Kala west of Grozny, Chechnya.

Significant archaeological discoveries near Inverness

Archaeologists have made several major discoveries at the site of the upcoming Old Petty Championship Golf Course at Cabot Highlands, near Inverness, Scotland.