2011 GSA Annual Meeting in Minneapolis (912 October 2011)
433 Wednesday, 12 October 2011
5:00 PM-5:05 PM, Minneapolis Convention Center: Ballroom A Foyer, 2nd Ave. Entrance

The North Shore Volcanic Group: A 9-Km Thick Plateau Lava Sequence in the Mesoproterozoic Midcontinent Rift System **CANCELLED**

Primary Leader: John C. Green
Leader(s): Terrence J. Boerboom, Thomas J. Fitz, Susanne T. Schmidt
Field Trip Description: The 1.1 Ga North Shore Volcanic Group is a major, well preserved, minimally-deformed plateau lava sequence with a wide range from primitive olivine tholeiite flood basalts to ferroandesites to very large, high-temperature rhyolites. The sequence experienced a hydrothermal zeolite to beginning greenschist facies overprint. This trip will visit examples of the major geochemical types and volcanic features, along with a few of the hypabyssal intrusions that intrude them. as well as some typical features of the hydrothermal alteration event.
Field Trip will span: 3 days
Sponsor(s):

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