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Earth History GEOL 2110

Earth History GEOL 2110. The Cryptozoic (Precambrian) SuperEon Part 2: The Paleoproterozoic Era. Major Concepts.

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Earth History GEOL 2110

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  1. Earth History GEOL 2110 The Cryptozoic (Precambrian) SuperEon Part 2: The Paleoproterozoic Era

  2. Major Concepts • After the formation of the Archean continental landmass (Kenoraland), Minnesota lay at a passive margin where sedimentary rocks accumulated including Snowball Earth tillites and the great Lake Superior banded iron formations. • These sedimentary rocks were deformed ~1.85 Ga by the collision of volcanic arc terrane with Kenoraland, an event called the Penokeanorogeny. This event sutured several Archean terrains together to form a larger continent called Laurentia. • Laurentia continued grow in the Paleoproterozic by adding more terrains to the south at 1.7Ga (Yavapiorogen) and 1.6Ga (Mazatzalorogen).

  3. Kenoraland Today’s Lecture

  4. Paleoproterozoic Rocks of Minnesota Sedimentary rock accumulated in the Animikie Sea then deformed in the PenokeanOrogeny

  5. Creating the Animikie Basin by Continental Rifting

  6. Paleoproterozoic Sedimentary Rocks of the Lake Superior Region Animikie Group Menominee Group Huronian Supergroup Archean

  7. HuronianSupergroup Sedimentary Rocks TILLITES U-bearing Matinenda Fm Carbonates of the Espanola Fm Ramsey Lake Fm Gowganda Fm Bruce Fm

  8. Limestone Paul Hoffman Tillite

  9. MESABI-TYPE IRON FORMATION Geologic Marker of a Major Evolutionary Event

  10. STROMATOLITES (Fossilized Algal Mats) Evidence of Early Life

  11. The 1.85 Ga Sudbury Impact The First Major Extinction Event ??

  12. Paleoproterozoic Iron Ranges of the Lake Superior Region Hibbing, MN Ishpeming, MI

  13. Rocheleau Pit Dunka Pit Peter Mitchell Pit

  14. Progressive Deformation across the PenokeanOrogen Eveleth – Flat-lying Biwabik Fe-Fm Jay Cooke Park – Deformed Thomson Fm St. Cloud – Granite intrusions

  15. St. Cloud Eveleth Jay Cooke

  16. Continental Shelf Suture –Niagara Fault Volcanic Arc

  17. DENUDATION OF A MOUNTAIN BELT

  18. SIOUX QUARTZITE ~1.7 Ga Mature Sandstone Blue Mounds State Park Flambeau Rib Mtn Baraboo Sioux Pipestone National Monument

  19. More Paleoproterzoic Mountain-building Events Yavapai Orogeny: 1770-1730 Ma MazatzalOrogeny: 1650-1600 Ma Holm et al., 2007

  20. Summary of Paleoproterozoic Tectonic Events in the Upper Midwest Holm et al., 2007

  21. PALEOPROTEROZOIC ACCRETED TERRANES Creation and Growth of LAURENTIA

  22. Next Lecture Early Evolution of Life Chapter 9 Guest Lecturer : Sebastian!

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