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Detrital zircons with ages greater than 4 billion years old have been found in these rocks, and a 4,404 ± 8 million year old zircon was found at Erawandoo Hill; this is the oldest dated material originating on Earth; the date is in the Cryptic era of the Hadean eon.
Feb 23, 2014 · Trace elements in the oldest zircons from Australia's Jack Hills range suggest they came from water-rich, granite-like rocks such as granodiorite or tonalite, other studies have reported.
Sep 24, 2018 · For the test, they collected zircons just older than 4 billion years—each about 100 microns across or roughly the width of a human hair—from the Jack Hills region of Western Australia.
While the Jack Hills detrital zircons tell us that rocks were definitely around at 4.404 Ga, actual rocks that old have not yet been found. In fact, some controversy exists in the scientific community as to the oldest rocks discovered to date.
Mar 6, 2023 · Our results reveal that although some Jack Hills zircons may be derived from trondhjemite-tonalite-granodiorite series rocks, which were common during the Archean (4–2.5 Ga), most (as high as...
Feb 24, 2014 · The new study, published in the journal Nature Geoscience, shows that zircon crystals from Western Australia’s Jack Hills region crystallized 4.4 billion years ago, strengthening the theory of a ‘cool early Earth,’ where temperatures were low enough for liquid water, oceans and a hydrosphere not long after the planet’s crust ...
The bits and pieces of rocks that make up the Jack Hills rock formation are ancient—over 3 billion years old. Individual crystals of zircon within the rocks are 4.4 billion years old, only 150 million years or so younger than the age of the Earth itself.
