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TitlePotential heat production from the Seagull and Teslin plutonic suites, southern Yukon: geochemistry, geochronology, rock physical properties, and 3-D geophysical inversion of Bouguer gravity data
AuthorColpron, M; Hayward, NORCID logo; Crowley, J L
SourceYukon Geological Survey, Yukon Exploration and Geology 2020 p. 47-72
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20200585
PublisherYukon Geological Survey
Mediaon-line; digital
File formatpdf
NTS105B/03; 105B/04; 105B/05; 105B/06; 105C/01; 105C/08
AreaTeslin-Wolf Lake
Lat/Long WENS-132.6667 -131.0000 60.6667 60.0000
Subjectsgeochemistry; geochronology; Science and Technology; granites; plutons; Teslin Plutonic Suite; Cretaceous
Illustrationslocation maps; photomicrographs; tables; Concordia diagrams; plots; geochemical plots; ternary diagrams; gravity profiles
ProgramGEM-GeoNorth: Geo-mapping for Energy and Minerals
Released2021 01 01
AbstractCretaceous granitoid plutons of the Seagull and Teslin plutonic suites, east of Teslin, are evaluated for their potential radiogenic heat production. The Seagull suite comprises ultra-fractionated, A-type granites dated at ca. 103-101 Ma that have anomalous average heat production values (A) of 7.9 to 9.9 uW/m3. The Teslin suite is older (ca. 121-109 Ma) and characterized by more intermediate granodiorite compositions that mostly have average A values of 2.0 uW/m3, closer to global averages. Locally, anomalous A values of 4.5 to 11.4 uW/m3 are associated with younger (ca. 110-108 Ma), more evolved granitic phases of the Teslin suite. The 3D inversion of Bouguer gravity data provides models that constrain the subsurface density character and extents of the Hake and Seagull batholiths, and estimated volumes of ~4624 and 2744 km3, respectively. The combination of these results suggests that potential heat energy of ~36.5 MWt may be contained in the Hake batholith, and as much as 27.2 MWt in the Seagull batholith.
Summary(Plain Language Summary, not published)
A comprehensive analysis of the geological character of Cretaceous aged granite plutons in southernmost Yukon is used to evaluate their potential as a source of geothermal energy. New data on the composition, age, and heat potential, from the decay of radioactive elements, are reported. The rocks are shown to have high concentrations of radioactive elements. The volume of the granite plutons, below ground, is modeled using regional gravity data, aided by new measurements of the density of rocks sampled from the plutons. The volume of granite rock, combined with their measured quantity of radioactive elements, enables an estimation of the total output of heat from the plutons, suggesting that they may be a source of geothermal energy.

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