Bibliographische Detailangaben
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Personen und Körperschaften:
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Berman, R G (VerfasserIn); Davis, W J (VerfasserIn); Corrigan, D (VerfasserIn); Nadeau, L (VerfasserIn) |
| Format: |
E-Artikel
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| Sprache: |
English
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| veröffentlicht: |
Natural Resources Canada, 2015 |
| Gesamtaufnahme: |
GEM2: Geo-mapping for Energy and Minerals
Insights into the tectonothermal history of Melville Peninsula, Nunavut, provided by in situ SHRIMP geochronology and thermobarometry; Geological Survey of Canada
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| Schlagwörter: |
Thermobarometry;
Metamorphic Rocks;
Garnet;
Deformation;
Foliation;
Metamorphism;
Metamorphic Facies;
Granulite Facies;
Structural Features;
Archean;
Shrimp;
Nunavut;
Melville Island;
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| Quelle: |
GEOSCAN
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| Zusammenfassung: |
Thermobarometric and in situ SHRIMP monazite geochronology indicate that tw...
Thermobarometric and in situ SHRIMP monazite geochronology indicate that two distinct metamorphic and deformational events affected Melville Peninsula. Monazite inclusions in garnet from two samples yielded ages of 2546 ± 7 Ma and 2539 ± 8 Ma. Textural features suggest they date an early deformation event in the development the Arrowsmith Orogen. Four samples from southern Melville Peninsula record monazite growth between ca. 1860 Ma and ca. 1820 Ma. Textures suggest that 1863 ± 6 Ma metamorphism initiated prior to pervasive regional deformation. Monazite growth is interpreted to date syntectonic garnet growth at ca. 1840 Ma and syntectonic, peak metamorphism at 1829 ± 4 Ma to 1825 ± 4 Ma. Petrological calculations define a clockwise P-T-t path consistent with crustal thickening that is attributed to ca. 1870 Ma collision of the Rae Craton with Meta Incognita microcontinent. Samples on northern Melville Peninsula record younger (ca. 1815-1767 Ma) monazite ages, potentially related to east-west compression that affected much of the central Rae Craton at this time.
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