Geological Field Trip--Eastern Isle Royale, Michigan, June 17-23, 2019
See the island in a geological light! No Geological background needed to enjoy this trip, but we will talk about some parts of Earth History in detail--A geological title (only for geologists!): Middle Proterozoic Continental Tholeiitic Flood Basalts of the 1.1 Ba Keweenaw Rift (Rodinia)
Geologic Features:
Magma Oceans---Very large lava flows, (volumes > 1000 km3 and with millennia-long solidification times)
Tilted sequence of multiple mafic lavas ponded in the Midcontinent rift valley with many preserved solidification features.
Spectacular landscapes
Wave-washed shoreline lava exposures,
Big Lava flows,
Variety of columnar jointing features,
Mafic dolerites and pegmatites, segregation cylinders
Beautiful minerals