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Isle Royale

Isle Royale. Pahoehoe. Flow direction. Columnar basalt. Amygdaloidal Basalt. zeolites. The zeolite “Thompsonite”. Basalt + felsic intrusives = bimodal magmatism. Copper Harbor Conglomerate. SE. NW. SE Dip direction. Dip direction. dip. Keweenaw Peninsula. dip.

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Isle Royale

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  1. Isle Royale

  2. Pahoehoe Flow direction

  3. Columnar basalt

  4. Amygdaloidal Basalt

  5. zeolites

  6. The zeolite “Thompsonite”

  7. Basalt + felsic intrusives = bimodal magmatism

  8. Copper Harbor Conglomerate

  9. SE NW SE Dip direction

  10. Dip direction

  11. dip Keweenaw Peninsula

  12. dip Copper Harbor Conglomerate Portage Lake Volcanics

  13. Dip direction

  14. Pre-Grenville structure

  15. What tectonic situation do these rocks and structures imply?

  16. Stage B – Hot Spot Rifting

  17. Pre-Grenville structure

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