Bibliographische Detailangaben
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Personen und Körperschaften:
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Drayson, D (VerfasserIn); Camacho, A (VerfasserIn); Sanborn-Barrie, M (VerfasserIn); Regis, D (VerfasserIn); Larson, K (VerfasserIn); Osinchuk, A (VerfasserIn); DuFrane, S A (VerfasserIn) |
| Format: |
Elektronische Zeitschrift
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| Sprache: |
English
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| veröffentlicht: |
Canadian Science Publishing, 2022 |
| Gesamtaufnahme: |
GEM2: Geo-mapping for Energy and Minerals
, Canadian Journal of Earth Sciences 2022 p. 1-22, Natural Resources Canada, Contribution Series
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| Schlagwörter: |
Shear Zones;
Deformation;
Nunavut;
Sanagak Lake;
Boothia Peninsula;
Zeitschrift;
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| Quelle: |
GEOSCAN
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| Zusammenfassung: |
The recently recognized Sanagak Lake shear zone (SLsz) is a 165 km long, so...
The recently recognized Sanagak Lake shear zone (SLsz) is a 165 km long, southwest striking corridor of high-strain rocks that transects the southern portion of Boothia Peninsula, Nunavut. This zone records pervasive deformation (DSL1) at conditions of 0.52 ± 0.03 GPa and ~700°C, and localized deformation (DSL2) at 300-500°C and = 0.5 GPa that preserve left lateral and right lateral senses of movement, respectively. Neocrystallized DSL1 titanite in a hornblende-bearing granodiorite yield an age of 1805 ± 6 Ma, interpreted to be the timing of DSL1. The timing of DSL2 is loosely bracketed by 40Ar/39Ar hornblende (1814 ± 3 Ma) and biotite (1743 ± 1 Ma) cooling ages since the deformation temperature falls between the estimated closure temperature of these minerals. Deformation and metamorphism at ca. 1.81 Ga on mainland Boothia and in the Committee Bay Belt has been attributed to the Superior Province colliding the with southeastern margin of the Rae craton; therefore, it is reasonable to suggest that the SLsz formed in response to far field stresses derived from this collision. The absence of ca. 1.81 Ga tectonic fabrics north of the shear zone, while present to the south, indicates that the SLsz marks the northwestern extent of mid-crustal, Trans-Hudson related tectonometamorphism. Currently it is unclear why strain is localized along this corridor. The emplacement of high-temperature granitic melts south of the shear zone between ca. 1840 and1820 Ma may have favored strain localization in this area; however, it is more likely that the SLsz is an extension of a regional structure that can be extrapolated southwest towards the boundary between the Sherman Basin and the Queen Maud granitoids.
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