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Collisional Snowbird tectonic zone resurrected: Growth of Laurentia during the 1.9 Ga accretionary phase of the Hudsonian orogeny.
- Source :
-
Geology . Oct2007, Vol. 35 Issue 10, p911-914. 4p. 1 Diagram, 1 Chart, 1 Map. - Publication Year :
- 2007
-
Abstract
- The ∼2800-km-long Snowbird tectonic zone is one of the most controversial tectonic features of the Canadian shield. Metamorphic and in situ geochronologic data reported here reveal that a 1.9 Ga medium- to high-pressure belt extends along most of this tectonic zone. In contrast to recent interpretations, a collisional origin is indicated by the length of this metamorphic belt, tectonic thickening documented in parts of it, geological contrasts across it, and subduction-type microdiamonds within it. This collisional event marks a pre—1.865 Ga phase of the Hudsonian orogeny involving microcontinent accretion that was fundamental to the growth of Laurentia. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00917613
- Volume :
- 35
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Geology
- Publication Type :
- Academic Journal
- Accession number :
- 26746995
- Full Text :
- https://doi.org/10.1130/G23771A.1