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GSA 2014. Field Trip on Canadian Cascade Volcanism
From: Graham Andrews <
gandrews1@xxxxxxxx>
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Fieldtrip 408 (pre-meeting; 10/16 - 10/18) Canadian Cascade Volcanism: Subglacial to Explosive Eruptions along the Sea to Sky Corridor, British Columbia
The
field trip has two somewhat diverse goals. The trip proceeds along the
Whistler corridor from Squamish to Pemberton and focuses on Quaternary
glaciovolcanic deposits. Interactions between volcanoes and ice in the
GVB have been common during the past two million years. This style of
volcanism has created a diverse array of landforms including subglacial
domes, tuyas, impounded lava masses, and esker-shaped lavas that
exploited within-ice drainage systems. The second part of the trip
follows logging roads northwest of Pemberton, British Columbia and
explores deposits resulting from the 2360 BP volcanic eruption of the
Mount Meager volcanic complex (MMVC). This eruption began Plinian-style,
generating pyroclastic fall and flow deposits; it ended with the
production of block and ash pyroclastic flows by explosive (Vulcanian)
collapse of lava domes (e.g., Soufriere Hills). What connects these two
separate days of field trips is that many of the characteristics of
these deposits are shaped by the style of eruption, in conjunction with
the nature of the surrounding landscape. In this regard, the trip
provides a spectacular window into the nature and hazards of effusive
and explosive volcanism occurring in mountainous terrains and the role
of water—both liquid and solid. Cost US$372.Those interested in this trip may also be interested in session T216:Cenozoic Magmatism and Volcanism in the North American Cordillera which has already been announced on the listserv.
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