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TitleCharacter and metallogeny of Permian, Jurassic and Cretaceous plutons in the southern Yukon-Tanana Terrane
AuthorLiverton, T; Mortensen, J K; Roots, C F
SourceYukon Exploration and Geology 2004; by Emond, D S (ed.); Lewis, L L (ed.); Bradshaw, G D (ed.); Yukon Geology Program, Yukon Exploration and Geology 2004, 2004 p. 147-165
Alt SeriesEarth Sciences Sector, Contribution Series 2004286
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia; Yukon
NTS104I; 104J; 104O; 104P; 105A; 105B; 105C; 105D; 105E; 105F; 105G; 105H
AreaWhitehorse; Cassier Fault
Lat/Long WENS-136.0000 -128.0000 62.0000 58.0000
Subjectsminerals; granites; ultramafic rocks; intrusions; plutons; continental margins; granodiorites; gabbros; strontium; titanium; magmatic arcs; peraluminous rocks; orogenies; hydrothermal systems; Swift River; Nisutlin River; Dorsey Complex; Ram Stock; Cassiar Platform; mineral geology; geochronology; isotopic dating; Permian; Jurassic; Cretaceous
Illustrationslocation maps; graphs; tables; Concordia diagrams
ProgramAncient Pacific Margin NATMAP Project
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
LinksOnline - En ligne
AbstractBetween the Swift and Nisutlin rivers, unmetamorphosed granite to ultramafic intrusions of four ages (from Permian through Cretaceous) span the amalgamation of Cassiar Platform with Yukon-Tanana and Cache Creek terranes. The mid-Permian granitic Ram Stock and two plutons cutting the Sylvester Allochthon lie at the edge of the Dorsey Complex, a remnant of an ancient passive margin succession that underlies the volcanic arcs of Yukon-Tanana Terrane. Middle Jurassic, locally foliated granodiorite to gabbro intrusions are etaluminous, and high in Sr and low in Ti compared to the Cretaceous suite. These 'I-type' volcanic arc plutons may be the remnants of an overlapping arc correlative with the Quesnel Terrane. The Cretaceous (113 to 98 Ma) meta- to peraluminous granites are late orogenic incipient 'A-type' plutons from highly fractionated F- and Cl-rich magmas. These generated extensive hydrothermal systems that produced tin, tungsten, molybdenum and beryl occurrences.