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In 1999, the oldest known rock on Earth was dated to 4.031 ±0.003 billion years, and is part of the Acasta Gneiss of the Slave Craton in northwestern Canada. [1]
In 2001, geologists found the oldest known rocks on Earth, the Nuvvuagittuq Greenstone Belt, on the coast of the Hudson Bay in northern Quebec. Geologists dated the oldest parts of the rockbed to about 4.28 billion years ago, using ancient volcanic deposits, which they call “faux amphibolite”.
Some of these rocks have Sm/Nd ages in excess of 4.0 Ga and may be the oldest rocks on Earth. From: NASA in the Public Domain. The NGB is bounded by a felsic intrusive rock known as a tonalite (see map below).
At about 4.3 billion years old, bedrock in northeastern Canada currently holds the title of oldest known rock on Earth (SN: 4/15/17, p. 8). In Western Australia, scientists have found...
Canadian bedrock more than 4 billion years old may be the oldest known section of the Earth's early crust. Scientists at the Carnegie Institution of Washington and McGill University in Montreal used geochemical methods to obtain an age of 4.28 billion years for samples of the rock, making it 250 million years more ancient than any previously ...
Jonathan O'Neil, who leads the competing team at the University of Ottawa, argues that the Nuvvuagittuq rocks formed as long as 4.4 billion years ago. That would make them by far the oldest...
As their boots sank into the marshy tundra and mosquitoes buzzed in their ears, the scientists were driven by a singular mission: to collect the oldest rocks on Earth. Earth was formed over 4.5...