A preliminary assessment of low pressure, amphibolite-facies metamorphism in the upper Hyland River area (NTS 105H), southeast Yukon
The regional metamorphic grade in southeast Yukon is low, but amphibolite-facies metamorphism has affected regions adjacent to numerous mid-Cretaceous intrusions. In the upper Hyland River area, contact aureoles approximately 300 m wide are developed around the Hyland and Boundary plutons, which are members of the 97-94 Ma Tungsten plutonic suite. Andalusite + cordierite + biotite-bearing assemblages in the aureole of the Hyland pluton imply emplacement at ~2.5-3 kbar, equivalent to a depth of 9 to 11 km. Cordierite + biotite assemblages in the aureole of the adjacent Boundary pluton suggest emplacement at shallower levels (<~2.5 kbar or <9 km). Metamorphism associated with these intrusions took place after most regional deformation. In contrast, rocks adjacent to the older (ca. 106 Ma) Mount Billings batholith were metamorphosed syn-kinematically. Staurolite ± andalusite ± sillimanite-bearing assemblages in metapelites east of the Mount Billings batholith indicate metamorphism at deeper levels (~4 kbar, or 15 km depth), coincident with the formation of structures oblique to the regional trend.
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Additional Info
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| Last Updated | October 20, 2025, 02:22 (UTC) |
| Created | October 20, 2025, 02:22 (UTC) |
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Domain / Topic
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Title
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A preliminary assessment of low pressure, amphibolite-facies metamorphism in the upper Hyland River area (NTS 105H), southeast Yukon |
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Description
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The regional metamorphic grade in southeast Yukon is low, but amphibolite-facies metamorphism has affected regions adjacent to numerous mid-Cretaceous intrusions. In the upper Hyland River area, contact aureoles approximately 300 m wide are developed around the Hyland and Boundary plutons, which are members of the 97-94 Ma Tungsten plutonic suite. Andalusite + cordierite + biotite-bearing assemblages in the aureole of the Hyland pluton imply emplacement at ~2.5-3 kbar, equivalent to a depth of 9 to 11 km. Cordierite + biotite assemblages in the aureole of the adjacent Boundary pluton suggest emplacement at shallower levels (<~2.5 kbar or <9 km). Metamorphism associated with these intrusions took place after most regional deformation. In contrast, rocks adjacent to the older (ca. 106 Ma) Mount Billings batholith were metamorphosed syn-kinematically. Staurolite ± andalusite ± sillimanite-bearing assemblages in metapelites east of the Mount Billings batholith indicate metamorphism at deeper levels (~4 kbar, or 15 km depth), coincident with the formation of structures oblique to the regional trend. |
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2013-02-25 |
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Open Government Licence - Yukon |
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https://open.canada.ca/data/en/dataset/58dd5e6f-512f-43f1-be6b-b2f702406ef6 |
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Government of Yukon | Gouvernement du Yukon |
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Yukon Geological Survey |
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[email protected] |
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None |
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None |
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