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| The Narryer Gneiss Complex is verifiably the oldest portion of the ] on Earth. A ] from the Narryer Gneiss has been dated at 4.4Ga, although the majority of zircon crystals are about 3.9Ga. | The Narryer Gneiss Complex is verifiably the oldest portion of the ] on Earth. A ] from the Narryer Gneiss has been dated at 4.4Ga, although the majority of zircon crystals are about 3.9Ga. | ||
| The gneiss itself is generally a leucocratic ] |
The gneiss itself is generally a leucocratic ] of ] grade, with severe polyphase deformation which makes interpretation of its ] essentially impossible. | ||
| ==Reference== | ==Reference== | ||
Revision as of 12:59, 16 December 2005
The Narryer Gneiss Complex is verifiably the oldest portion of the crust on Earth. A zircon from the Narryer Gneiss has been dated at 4.4Ga, although the majority of zircon crystals are about 3.9Ga.
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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