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| The Narryer Gneiss |
The '''Narryer Gneiss Terrane''' complex is verifiably the oldest known portion of the ] on Earth. Samples of ] from the ] portion of the Narryer Gneiss have been ] dated at 4.4 Ga, although the majority of zircon crystals are about 3.9 Ga. | ||
| The gneiss itself is generally a leucocratic ] of ] grade, with severe polyphase deformation which makes interpretation of its ] essentially impossible. | The ] itself is generally a leucocratic ] of ] grade, with severe polyphase deformation which makes interpretation of its ] essentially impossible. | ||
| ==Reference== | ==Reference== | ||
Revision as of 02:37, 16 February 2006
The Narryer Gneiss Terrane complex is verifiably the oldest known portion of the crust on Earth. Samples of zircon from the Jack Hills portion of the Narryer Gneiss have been radiometrically dated at 4.4 Ga, although the majority of zircon crystals are about 3.9 Ga.
The gneiss itself is generally a leucocratic metamorphic rock of amphibolite grade, with severe polyphase deformation which makes interpretation of its protolith essentially impossible.
Reference
Geochronological analysis of Narryer Gneiss zircons
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