*************************************************************** From: Andrew Greene <agreene@xxxxxxxxxx> *************************************************************** Hello all, We are writing to announce a field trip to Wrangellia flood basalts on Vancouver Island, British Columbia to be held following the Goldschmidt 2008 conference from July 19-22, 2008. Wrangellia flood basalts on Vancouver Island: An accreted Late Triassic oceanic plateau The Wrangellia flood basalts on Vancouver Island (Karmutsen Formation) are part of one of the best exposed accreted oceanic plateaus on Earth. The Karmutsen Formation (~20,000 km2) covers over half of Vancouver Island (460 x 130 km) and was constructed as an emergent oceanic plateau at ca. 230 Ma. The entire volcanic stratigraphy (~6 km thick) is exposed on Vancouver Island, and is bounded by marine sediments and overlies Paleozoic oceanic arc volcanic sequences 2-5 km thick. These units belong to the allochthonous Wrangellia terrane that extends northwards through the Queen Charlotte Islands into southern Alaska. The Karmutsen Formation is comprised of basal sediment-sill complexes, a lower member of pillowed and unpillowed submarine flows, a middle member of mostly pillow breccia and hyaloclastite, and an upper member of subaerial flows. Recent mapping, field work, and geochemistry are beginning to paint a clearer picture of the growth history and source and origin of magmas that constructed this enormous volcanic edifice. The goal of this field trip is to observe volcanological features and obtain a perspective of the volcanic stratigraphy and flood basalt emplacement in this oceanic plateau. The Paleozoic basement rocks will also be visited. Our hope is for participants to gain a perspective about the construction and composition of this oceanic plateau and the geology of the Wrangellia terrane on northern and central Vancouver Island. Leaders: Andrew Greene, University of BC (agreene@xxxxxxxxxx) Graham Nixon, BC Geological Survey James Scoates , University of BC Nick Massey, BC Geological Survey When: Leaving at ~10 am on July 19th (Saturday; the day after the conference) and returning by ~6 pm on July 22nd (Tuesday). Cost: $625 CAD per person More detailed information about the trip is provided at the following link: http://www.goldschmidt2008.org/fieldTrips The field trip is limited to 25 participants. To register, follow directions at the above link. We hope to see some of you at the Goldschmidt conference in Vancouver, Andrew Greene, Graham Nixon, James Scoates, Nick Massey ============================================================== To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxxx To contribute to the volcano list, send your message to: volcano@xxxxxxxx Please do not send attachments. ==============================================================
