Nuvvuagittuq Greenstone Belt rocks dated to 4.16 billion years
This digest was compiled by AI from multiple sources — links to the originals are below.
A 2025 study in Science dated mafic intrusions in the Nuvvuagittuq Greenstone Belt near Inukjuak, northern Quebec, to about 4.16 billion years ago. The intrusions cut through older volcanic rocks, making the age a minimum for the surrounding sequence. The finding challenges the Acasta Gneiss as the oldest intact rock, though some geochemists seek confirmation from additional radiometric systems.
Key Facts
- A 2025 study in Science dated mafic intrusions in the Nuvvuagittuq Greenstone Belt to about 4.16 billion years ago.
- The intrusions cut through an older volcanic unit, making the 4.16-billion-year date a minimum age for the surrounding rocks.
- Zircon crystals from the Jack Hills of Western Australia include one dated to about 4.404 billion years, the oldest known terrestrial material.
- The Acasta Gneiss in Canada's Northwest Territories, dated to roughly 4.03 billion years, was previously considered the oldest undisputed intact rock.
- A 2008 study reported whole-rock dates from Nuvvuagittuq ranging from 3.8 to 4.28 billion years using samarium-146 and neodymium-142.
The Nuvvuagittuq Greenstone Belt
The Nuvvuagittuq Greenstone Belt lies near Inukjuak in northern Quebec's Nunavik region along Hudson Bay. It consists largely of metamorphosed volcanic rocks rich in magnesium and iron. The belt has endured more than four billion years of heating, pressure, folding, deformation and fluid movement. Despite this alteration, enough of the rock body and its field relationships remain together to reconstruct a sequence of events.
Dating the Hadean Rocks
The 2025 Science study dated mafic intrusions inside the belt to the Hadean eon, about 4.16 billion years ago. These intrusions cut through an older volcanic unit, so the surrounding rocks had to exist before the magma entered them. The visible sequence therefore turns the isotope result into a minimum age for the belt. Some geochemists remain cautious about the uncertainties and would like confirmation from additional radiometric systems.
Oldest Rock vs Oldest Material
Zircon crystals from the Jack Hills of Western Australia formed far earlier, including one dated to about 4.404 billion years. A landmark analysis of that zircon found chemistry consistent with early crust and liquid water. Those zircons are the oldest known pieces of terrestrial material, but their original host rocks were destroyed. The resilient crystals survived erosion and were later incorporated into sedimentary rocks hundreds of millions of years younger. Nuvvuagittuq offers a different archive: its ancient material remains in a coherent, mappable body, allowing geologists to examine which units touch, intrude or predate one another.
1 source
Nuvvuagittuq Greenstone Belt rocks dated to 4.16 billion years
