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The Duke River fault, southwest Yukon: Preliminary examination of the relationships between Wrangellia and the Alexander terrane
The Duke River fault is a terrane-bounding structure that separates the Alexander terrane from Wrangellia in southwest Yukon. Detailed geological mapping and sampling of three key areas along the fault was completed in August 2009. In these areas, the fault juxtaposes multiply folded, pervasively foliated, greenschist facies rocks of the Alexander terrane against low-grade Wrangellian rocks that record only one phase of folding. Shear bands, fold orientations, rotated grains, lineations, mica fish and fault plane orientations indicate that the Alexander terrane has been thrust over Wrangellia. Preliminary 40Ar/39Ar ages from muscovite grains that may have been reset by motions along the Duke River fault or grown during faulting range from 90-104 Ma, suggesting that movement along the fault is at least as old as Cretaceous. Miocene felsic intrusions and Miocene to Pliocene crustal tuffs of the Wrangell lavas have been deformed by the Duke River fault, suggesting movement occurred as recently as the Pliocene
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연관 데이터
Structure and kinematic evolution of the Duke River fault, southwestern Yukon
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for a copy of this paper please contact the Yukon Geological Survey; geology@gov.yk.ca.
Timing and kinematics of the Duke River fault: insights into the evolution of the Insular Terrane, southwest Yukon
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A copy of this thesis is available at the EMR library – QE195.C633 2011. This thesis is available online at http://hdl.handle.net/2429/38156.
Bedrock geology along the Duke River fault near Silver Creek, Yukon (part of NTS 115B/16)
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not_specified
Bedrock geology along the Duke River fault near Jessie Creek, Yukon (part of NTS 115B/16)
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not_specified
Bedrock geology along the Duke River fault near Hoge Creek, Yukon (part of NTS 115G/05)
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not_specified
Bedrock geology along the Duke River fault near Squaw Creek, Yukon and British Columbia (part of NTS 115A/03 and 114P/14)
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not_specified
Bedrock geology at the boundary between Yukon-Tanana and Cassiar terranes, Truitt Creek map area (NTS 105L/1), south-central Yukon
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The Tummel fault zone, a northwest-trending belt of rocks of uncertain age and/or tectonic affinity, separates Paleozoic miogeoclinal strata of Cassiar Terrane from Yukon-Tanana Terrane metavolcanic and metasedimentary rocks. Northeast of the fault, Cassiar Terrane comprises pelitic and semipelitic rocks with rare amphibolite, which are correlated with the Kechika Group. These are overlain by carbonate correlated with the Askin Group. Southwest of the fault, in Yukon-Tanana Terrane, Devono-Mississippian siliciclastic rocks are overlain by Mississippian arc volcanic rocks. Granodiorite and diorite of the Telegraph Plutonic Suite (348-350 Ma) intrude the siliciclastic rocks. Foliated greenstone, leucogabbro intrusions, serpentinite and chert occur in the Tummel fault zone. The Early Cretaceous Glenlyon Batholith intrudes strata of Cassiar Terrane. Contact metamorphism recognized across the Tummel fault zone is interpreted to have been imposed by the Glenlyon Batholith. If correct, this interpretation requires that post-mid-Cretaceous displacement across the Tummel fault zone has been minimal (~5 km).
Bedrock geology along the Duke River fault near Bullion Creek, Yukon (part of NTS 115G/02)
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not_specified
Bedrock geology along the Duke River fault near Klutlan Glacier, Yukon (part of NTS 115F/07)
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not_specified
Geological map of the Duke River area (parts of NTS 115G/2, 3, 5, 6, 7), Yukon (1:50,000 scale)
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not_specified
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