| Revision as of 08:31, 16 December 2005 editRolinator (talk | contribs)2,296 editsNo edit summary | Revision as of 08:31, 16 December 2005 edit undoRolinator (talk | contribs)2,296 editsmNo edit summaryNext edit → | ||
| Line 1: | Line 1: | ||
| 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 ] rock of amphibolite grade, with severe polyphase deformation which makes interpretation of its ] essentially impossible. | ||
Revision as of 08:31, 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.