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Article: U-Pb geochronology and geologic significance of the two oldest known mafic dyke swarms on earth: 3659. (Geological Association of Canada 2000 Annual Technical Meeting Newfoundland Section).
- Article from:
- Atlantic Geology
- Article date:
- July 1, 2000
- Author:
CopyrightCOPYRIGHT 2000 Atlantic Geoscience Society. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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U-Pb geochronology and geologic significance of the two oldest known mafic dyke swarms on earth: 3659 Ma Inaluk dykes and 3490 Ma Tarssartoq dykes, southern west Greenland
Mafic dyke swarms are valuable time markers in the Archean craton of southern west Greenland. The Ameralik dykes in the Godthabsfjord region are particularly useful for differentiating early Archean rocks and tectonic events from late Archean rocks and events. The only age constraint on these dykes in their type locality (outer Godthabsfjord) is that they intruded between suites of rocks formed at 3.6 Ga and 3.0 Ga. In outer Godthabsfjord, the dykes were strongly deformed and metamorphosed in ...