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MMEW 2014 Field trips

MMEW 2014 Field trips. Trip 1, June 18 Trip 2, June 19 Minnesota River Valley. Precambrian Terranes of Minnesota. The Minnesota River Valley Gneiss Terrane 3.6-3.1 Ga. THE MINNESOTA RIVER VALLEY. Actually it’s 3,485,000,000 years ±10,000,000 but hey, close enough.

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MMEW 2014 Field trips

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  1. MMEW 2014 Field trips Trip 1, June 18 Trip 2, June 19 Minnesota River Valley

  2. Precambrian Terranes of Minnesota

  3. The Minnesota River Valley Gneiss Terrane 3.6-3.1 Ga

  4. THE MINNESOTA RIVER VALLEY Actually it’s 3,485,000,000 years ±10,000,000 but hey, close enough

  5. Amphibolite (oceanic crust?) GRANITIC(= continental)GNEISS(= high grade metamorphic)

  6. Geologic Structure of Southwestern Minnesota SMOG map superimposed gravity (color) on aeromagnetics (grayscale)

  7. Yellow Medicine Shear Zone A suture zone between the Morton and Montevideo Blocks? Composed of garnet mafic gneiss and amphibolite (ocean crust in suture zone?)

  8. You are here.

  9. From Pat Colgan

  10. tillglacial stream sedimentglacial lake sedimentmodern stream sediment

  11. 780,000 years ago Blue spikes represent glacial periods 1.66 million years ago 2.58 million years ago Lisiecki and Raymo, 2005

  12. Series of old tills on Yellow Medicine River cut

  13. Talk by former student and TA, Andy Breckenridge …and it’s potential impact on global climate

  14. Scour surfaces flanking main channel

  15. You are here. Low relief till plains and ice lobe troughs Make the most of it!

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