NEW YORK: Scientists have identified what could be the oldest rocks on Earth from a rock formation in Canada.
The Nuvvuagittuq Greenstone Belt has long been known for its ancient rocks — plains of streaked gray stone on the eastern shore of Hudson Bay in Quebec. But researchers disagree on exactly how old they are.
Work from two decades ago suggested the rocks could be 4.3 billion years old, placing them in the earliest period of Earth’s history. But other scientists using a different dating method contested the finding, arguing that long-ago contaminants were skewing the rocks’ age and that they were actually slightly younger at 3.8 billion years old.
In the new study, researchers sampled a different section of rock from the belt and estimated its age using the previous two dating techniques — measuring how one radioactive element decays into another over time. The result: The rocks were about 4.16 billion years old.
The different methods “gave exactly the same age,” said study author Jonathan O’Neil with the University of Ottawa.
The new research was published Thursday in the journal Science.
Earth formed about 4.5 billion years ago from a collapsing cloud of dust and gas soon after the solar system existed. Primordial rocks often get melted and recycled by Earth’s moving tectonic plates, making them extremely rare on the surface today. Scientists have uncovered 4 billion-year-old rocks from another formation in Canada called the Acasta Gneiss Complex, but the Nuvvuagittuq rocks could be even older.
Studying rocks from Earth’s earliest history could give a glimpse into how the planet may have looked — how its roiling magma oceans gave way to tectonic plates — and even how life got started.
“To have a sample of what was going on on Earth way back then is really valuable,” said Mark Reagan with the University of Iowa, who studies volcanic rocks and lava and was not involved with the new study.
The rock formation is on tribal Inukjuak lands and the local Inuit community has temporarily restricted scientists from taking samples from the site due to damage from previous visits.
After some geologists visited the site, large chunks of rock were missing and the community noticed pieces for sale online, said Tommy Pallizer, who manages the land with the Pituvik Landholding Corp. The Inuit community wants to work with scientists to set up a provincial park that would protect the land while allowing researchers to study it.
“There’s a lot of interest for these rocks, which we understand,” said Pallizer, a member of the community. “We just don’t want any more damage.”
These Canadian rocks may be the oldest on Earth
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These Canadian rocks may be the oldest on Earth
Cambodia takes back looted historic artifacts handled by British art dealer
- The objects were returned under a 2020 agreement between the Ministry of Culture and Fine Arts and the family of the late Douglas Latchford, a British art collector and dealer who allegedly had the items smuggled out of Cambodia
PHNOM PENH, Cambodia: Cambodian officials on Friday received more than six dozen historic artifacts described as part of the country’s cultural heritage that had been looted during decades of war and instability.
At a ceremony attended by Deputy Prime Minister Hun Many, the 74 items were unveiled at the National Museum in Phnom Penh after their repatriation from the United Kingdom.
The objects were returned under a 2020 agreement between the Ministry of Culture and Fine Arts and the family of the late Douglas Latchford, a British art collector and dealer who allegedly had the items smuggled out of Cambodia.
“This substantial restitution represents one of the most important returns of Khmer cultural heritage in recent years, following major repatriations in 2021 and 2023 from the same collection,” the Culture Ministry said in a statement. “It marks a significant step forward in Cambodia’s continued efforts to recover, preserve, and restore its ancestral legacy for future generations.”
The artifacts were described as dating from the pre-Angkorian period through the height of the Angkor Empire, including “monumental sandstone sculptures, refined bronze works, and significant ritual objects.” The Angkor Empire, which extended from the ninth to the 15th century, is best known for the Angkor Wat archaeological site, the nation’s biggest tourist attraction.
Latchford was a prominent antiquities dealer who allegedly orchestrated an operation to sell looted Cambodian sculptures on the international market.
From 1970 to the 1980s, during Cambodia’s civil wars and the communist Khmer Rouge ‘s brutal reign, organized looting networks sent artifacts to Latchford, who then sold them to Western collectors, dealers, and institutions. These pieces were often physically damaged, having been pried off temple walls or other structures by the looters.
Latchford was indicted in a New York federal court in 2019 on charges including wire fraud and conspiracy. He died in 2020, aged 88, before he could be extradited to face charges.
Cambodia, like neighboring Thailand, has benefited from a trend in recent decades involving the repatriation of art and archaeological treasures. These include ancient Asian artworks as well as pieces lost or stolen during turmoil in places such as Syria, Iraq and Nazi-occupied Europe. New York’s Metropolitan Museum of Art is one of the prominent institutions that has been returning illegally smuggled art, including to Cambodia.
“The ancient artifacts created and preserved by our ancestors are now being returned to Cambodia, bringing warmth and joy, following the country’s return to peace,” said Hun Many, who is the younger brother of Prime Minister Hun Manet.
