Plutonic rocks of the Thirtymile Range, Dorsey Terrane; ultrafractionated tin granites in the Yukon

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doi: 10.1139/e94-138
Authors:Liverton, T.; Alderton, D. H. M.
Author Affiliations:Primary:
Royal Holloway and Bedford New College, Department of Geology, Egham, Surrey, United Kingdom
Volume Title:Canadian Journal of Earth Sciences Revue Canadienne des Sciences de la Terre
Source:Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre, 31(10), p.1557-1568. Publisher: National Research Council of Canada, Ottawa, ON, Canada. ISSN: 0008-4077
Publication Date:1994
Note:In English with French summary. 57 refs.; illus., incl. 2 tables, geol. sketch map
Summary:Two distinct suites, hornblende-rich granodiorite and granodiorite, make up the granitic plutonic rocks of the W part of the Dorsey terrain and form the NW and SW Thirtymile stocks, respectively. These are similar to many calc-alkaline Cordilleran intrusions and are not associated with any mineralization. Biotite granite forms the bulk of the Thirtymile stock, and displays major- and trace-element trends that correspond with those shown by the adjacent Hake and Seagull batholiths. These latter granites are interpreted as representing a single magmatic suite which is associated with F-B-rich skarn tin-tungsten mineralization. The most evolved lithofacies of the Ork and Thirtymile stocks is an alkali-feldspar-rich zinnwaldite-topaz-fluorite leucogranite with an extremely evolved chemistry (differentiation index up to 99.4 and Rb/Sr ratio >> 3000), with trace-element contents normally associated with 'A-type' granites. This is interpreted as the result of ultrafractionation of a halogen-rich residual granitic melt. [R.A.H.]
Subjects:Batholiths; Fractional crystallization; Geochemistry; Granites; Granodiorites; Igneous rocks; Intrusions; Lithogeochemistry; Magmas; Magmatic differentiation; Major elements; Metal ores; Mineralization; Plutonic rocks; Plutons; Stocks; Tin ores; Trace elements; Canada; Canadian Cordillera; North America; North American Cordillera; Western Canada; Yukon Territory; Dorsey Terrane; Hake Batholith; Ork Stock; Seagull Batholith; Thirtymile Range; Ultrafractionation
Coordinates:N603000 N603400 W1322500 W1323300
Abstract Numbers:95M/3521
Record ID:1995006705
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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