Some Reflections on the Mesoproterozoic Belt- Purcell Basin

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Presentation transcript:

Some Reflections on the Mesoproterozoic Belt- Purcell Basin David Mogk, Montana State University Paul Mueller, University of Florida Carol Frost, University of Wyoming

Current Tectonostratigraphic Configuration of the Belt Supergroup from Sears et al., 2007

Lydon (2007) Geology and metallogeny of the Belt-Purcell Basin

From Vuke et al., 2009

Pre-Belt Basement Sample Localities and Primary Ages does not include xenocrysts ages Clearwater & related (1.86 & 2.6 Ga) Great Falls tectonic zone Little Belt gneisses (1.79-1.86 Ga), Medicine Hat (2.6-2.7 Ga) Montana Metasedimentary Terrane (3.2-3.4 Ga with 2.45 & 1.77 Ga overprint) Pioneer gneiss (1.86 Ga) Biltmore gneiss (1.89 Ga) Beartooth Mountains (2.75-2.85 Ga) Armstead gneiss (2.73 Ga) Medicine Lodge Creek (2.45 Ga) Bloody Dick Creek (1.9 Ga)

Neihart Quartzite: Little Belt Mountains Rests unconformably on GFTZ basement KDE plot f GFTZ Youngest zircon is 1.71 Ga 207Pb/206Pb Age (Ma)

Conglomerate Matrix, Jefferson Canyon LaHood Formation Conglomerate Matrix, Jefferson Canyon 207Pb/206Pb Age (Ma) f

LaHood Formation 207Pb/206Pb Age (Ma) Siltstone from Golden Sunlight Mine Mode shifts from 3.5-3.6 Ga to 3.2-3.4 Ga 2.7 and 1.8 Ga appear f Youngest zircon measured in the LaHood is 1.78 Ga Armstead/Gravelly 207Pb/206Pb Age (Ma)

LaHood Siltstone f 207Pb/206Pb Age (Ma) Horseshoe Hills Spanish Peaks Mode continues at 3.2-3.4, BBMZ appears GFTZ zircons persist 3.5-3.6 Ga persists, but diminished f Great Falls/Big Sky Beartooth Bighorn 3.58 Ga 207Pb/206Pb Age (Ma) Note: Only 3 grains > 10% discordant

Western conjugate of the Belt Basin? Siberia? SWEAT or No SWEAT?

Questions About the Belt Basin What is the provenance of the sediments? What is the tectonic and depositional environments of deposition? Are the lower Belt units actually Pre-Belt? What is the western conjugate of the Belt Basin? Siberia? SWEAT? What is basement to the Belt basin, and how did this influence the geometry of the Basin? Control of younger Sevier-style structures? How did the Belt Basin accommodate 20 km of deposition? What controls metallogenesis in the Belt Basin: