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ESCI 536 - Rocky Mountains FT Precambrian-Cambrian Stratigraphy & Paleogeography: North American Cordillera

ESCI 536 - Rocky Mountains FT Precambrian-Cambrian Stratigraphy & Paleogeography: North American Cordillera. February 3, 2010 J. Morgan. Precambrian Crystalline Basement & Belt Supergroup. 1500-900 m.y. 2400-1500 m.y. (Stewart & Suczec, 1977). Diamictite & Volcanic Sequences. 900-800 m.y.

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ESCI 536 - Rocky Mountains FT Precambrian-Cambrian Stratigraphy & Paleogeography: North American Cordillera

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  1. ESCI 536 - Rocky Mountains FTPrecambrian-Cambrian Stratigraphy & Paleogeography:North American Cordillera February 3, 2010 J. Morgan

  2. Precambrian Crystalline Basement & Belt Supergroup 1500-900 m.y. 2400-1500 m.y. (Stewart & Suczec, 1977)

  3. Diamictite & Volcanic Sequences 900-800 m.y. (Stewart & Suczec, 1977)

  4. 540-500 m.y. Shallow water carbonates 650-540 m.y. Shallow water terrigenous sediments 900-800 m.y. Local diamictite, volcanics & more 1500-900 m.y. Belt supergroup (correlative) Proterozoic basement 2400-1500 m.y. (Stewart & Suczec, 1977)

  5. Stratigraphy Belt Supergroup (N Cordielleran) • PC: Crystalline rocks • UPC: Discontinuous, locally up to 3000 m of diamictite, mudstone, sandstone, cgl, & mafic volcanics • UPC-LC: Westward thickening wedge, locally > 6000 m, of terrigenous detrital rocks • MC-UC: Predominantly shallow water carbonates, up to 2000 m thick

  6. Precambrian & Cambrian Stratigraphy (Stewart & Suczec, 1977)

  7. Late Precambrian-Cambrian Evolution, Western NA Late Precambrian rifting (850 m.a.) (Stewart & Suczec, 1977)

  8. Stratigraphy • Craton • Deposition in local rift valleys • Rapid erosion of uplifted rift margins • Accumulation on subsided shallow-water shelf • PC: Crystalline rocks • UPC: Discontinuous, locally up to 3000 m of diamictite, mudstone, sandstone, cgl, & mafic volcanics • UPC-LC: Westward thickening wedge, locally > 6000 m, of terrigenous detrital rocks • MC-UC: Predominantly shallow water carbonates, up to 2000 m thick

  9. Lower Paleozoic Rifted Margin

  10. Laramide Reactivation of Basement Structures

  11. Inherited Structural Trends Cotton-wood Canyon

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