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

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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. - PowerPoint PPT Presentation

Text of ESCI 536 - Rocky Mountains FT Precambrian-Cambrian Stratigraphy & Paleogeography: North American...

  • ESCI 536 - Rocky Mountains FT

    Precambrian-Cambrian Stratigraphy & Paleogeography:North American CordilleraFebruary 3, 2010J. Morgan

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

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

  • 2400-1500 m.y.1500-900m.y.(Stewart & Suczec, 1977)900-800m.y.650-540m.y.540-500m.y.Shallow water carbonatesShallow water terrigenous sedimentsLocal diamictite, volcanics & moreProterozoic basementBelt supergroup (correlative)

  • StratigraphyPC: Crystalline rocksUPC: Discontinuous, locally up to 3000 m of diamictite, mudstone, sandstone, cgl, & mafic volcanicsUPC-LC: Westward thickening wedge, locally > 6000 m, of terrigenous detrital rocksMC-UC: Predominantly shallow water carbonates, up to 2000 m thickBelt Supergroup (N Cordielleran)

  • Precambrian & Cambrian Stratigraphy(Stewart & Suczec, 1977)

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

  • StratigraphyPC: Crystalline rocksUPC: Discontinuous, locally up to 3000 m of diamictite, mudstone, sandstone, cgl, & mafic volcanicsUPC-LC: Westward thickening wedge, locally > 6000 m, of terrigenous detrital rocksMC-UC: Predominantly shallow water carbonates, up to 2000 m thickCratonDeposition in local rift valleys

    Rapid erosion of uplifted rift marginsAccumulation on subsided shallow-water shelf

  • Lower Paleozoic Rifted Margin

  • Laramide Reactivation of Basement Structures

  • Inherited Structural TrendsCotton-woodCanyon