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Preliminary geology of the Pool Creek map area (95C/5), southeastern Yukon
Fieldwork in the northwest corner of Pool Creek map area (NTS 95C/5) during the summer of 2000 distinguished North and South areas with distinct stratigraphies and deformation histories. The South area is underlain mainly by siliciclastic sedimentary rocks (1100 m total thickness in three units) of uncertain age (Proterozoic?). North area stratigraphy (1800 m total thickness in seven units) ranges in age from Ordovician to Mississippian and consists of an interbedded succession of carbonates,sandstones, siltstones,and shales.Major shale units in the succession are correlated with Road River and Earn groups. Strata in both areas have been intruded by a north-trending, unfoliated, Eocene (?) syenite. The syenite has a thin contact metamorphic aureole consisting of skarn, gossan, and biotite hornfels. Deformation in the South area is characterized by broad, northeast-trending, subhorizontal folds, which are likely coeval with syenite intrusion. Units in the North area are deformed into tight, overturned, north-plunging, east-verging folds with a well developed, axial planar, slaty cleavage in the hinge zones. North area deformation probably predates syenite intrusion. Our fieldwork confirmed previously reported U-Th-REE prospects associated with the syenite and favourable stratigraphy for sedimentary-exhalative targets in the North area.
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연관 데이터
Geological map of Pool Creek (NTS 95C/5), southeastern Yukon (1:50 000 scale)
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Includes geological cross sections, possible stratigraphic correlations, fossil occurrences and mineral occurrences.
Geological map of the Pool Creek area (NTS 95C/5), southeast Yukon
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not_specified
Geological map of part of Waters Creek and Fire Lake map areas (part of NTS 105G/1,2), southeastern Yukon
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not_specified
Preliminary geological map of part of the Money Creek area (105H/5), southeastern Yukon
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Preliminary geological map includes mineral occurrences and fossil localities.
Preliminary geological map of the Quill Creek area (parts of NTS 115G/5, 6, 12), southwest Yukon (1:50 000 scale)
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not_specified
Geological map of Clear Creek area, western Selwyn Basin, Yukon
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Geological map (1:50,000 scale) of Clear Creek area, central Yukon (NTS 115P/14) including geological cross sections, mineral occurrences, structural relationships and U-Pb age determinations.
Geology of Thirty-seven Mile Creek map area (105D/13), southern Yukon (1:50 000 scale)
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Geology including geological cross sections and mineral occurrences.
Geological map of Michie Creek (NTS 105D/9) and parts of Tagish (NTS 105D/8) areas
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not_specified
Geology of Gravel Creek (105B/10) and Irvine Lake (105B/11) Map Areas, Southeastern Yukon
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The Irvine Lake and Gravel lake map-areas (NTS 105B/10,11) lie within the northern Omineca Belt, west of the Tintina-Northern Rocky Mountain Trench (NRMT) fault. The eastern part of the area is underlain by Proterozoic to early Paleozoic metasedimentary rocks of Cassiar terrane, a fragment of the North American miogeocline which has been displaced northward on the Tintina-NRTM fault. The western part of the area is underlain by basaltic metavolcanics, serpentinized ultramafic rocks, metagabbro, and cherty and calcareous metasediments of the Slide Mountain terrane. Unfoliated to weakly foliated granitic intrusives (Marker Lake and Cassiar batholiths and Cabin Creek and Gravel Creek stocks) occur throughout the area intruding both the Cassiar and Slide Mountain terranes. Slide Mountain and Cassiar terranes are juxtaposed by an east-verging thrust referred to in this area as the Zak fault. Southwest of Irvine Lake, the thrust places serpentine, basaltic meta-volcanics, and an undeformed dioritic intrusion onto a footwall consisting of the Proterozoic Tsaydiz Formation and older units. Northwest of Irvine Lake, near Shootamook Creek, the thrust places cherty metasediments of the allochthon onto marble and quartzite inferred to be lower Cambrian Rosella and Boya Formations, respectively. The northern end of the Cassiar batholith extends into the southwestern corner of Irvine Lake map area. Its northeastern contact with rocks of Slide Mountain terrane is a subvertical, northwest-southeast trending mylonite zone several tens of metres wide. Mesoscopic structures including S-C fabrics and shear bands prove dextral displacement parallel to a variably plunging, but commonly sub-horizontal stretching lineation. The mylonite zone lies along a pronounced topographic lineamnet which extends from the trace of the Cassiar fault south of the Alaska Highway northwestwardly into the Irvine Lake map-area rather than veering to the west as previously mapped. Mineral occurrences in this area are primarily near the contact of granitic intrusions and carbonate rocks. Carbonate rocks hosting the deposits belong to the upper Proterozoic Ingenika Group (Swannell, Tsaydiz and Espee formations) rather than the Lower Cambrian Atan Group as has been inferred for nearby deposits in the Rancheria district. Other, non-carbonate-hosted mineral occurrences include a porphyry Mo prospect and Ag, Pb, Zn veins.
Geological Map of Thirty-seven Mile Creek Area, Southern Yukon (105D/13)
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not_specified
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