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From: Lisa Morgan <lmorgan@xxxxxxxx>
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Dear colleagues,
Below is a brief description of a pre-meeting field trip for the national
GSA meeting this fall that Ken Pierce and I will be leading in October. We
invite you to consider participating in this field trip.
Track of the Yellowstone hotspot: Young and ongoing geologic processes
from the Snake Rive Plain to Yellowstone
October 23-27, 2007
Field trip leaders: Lisa A. Morgan, and Kenneth L. Pierce, U.S.
Geological Survey; contacts: <mailto:lmorgan@xxxxxxxx>lmorgan@xxxxxxxx,
<mailto:kpierce@xxxxxxxx>kpierce@xxxxxxxx
The 16-Ma Yellowstone hotspot track is one of the few places
on Earth where: 1) a time-transgressive suite of processes on continental
crust can be seen in the volcanic, faulting, and uplift record, and
2) this occurs over the last 10 Ma at the rate and direction as predicted
by plate motion. Recent interest in young and possibly renewed volcanism
at Yellowstone coupled with new discoveries and previous synthesis for
Yellowstone (from new tomographic, deformation, bathymetric, seismic
surveys) has renewed the discussion as to its possible plume origin.
This field trip will highlight various stages in the evolution
of the Snake River Plain-Yellowstone Plateau bimodal volcanic province,
also known as the track of the Yellowstone hot spot. Field trip stops will
include the young basaltic Craters of the Moon, exposures of 4-12-Ma
rhyolites and edges of their collapsed calderas on the Snake River Plain,
faulting progressing with the volcanic fields, and Yellowstone National
Park where the last major caldera-forming event occurred 640,000 years ago
and is now host to the world's largest hydrothermal field. This is a 5-day
trip that starts at the GSA national meeting site in Denver. We will drive
from Denver to Pocatello where for the next 3 days, we will present a quick
but intensive overview into volcanism and tectonism in this dynamically
active region. We will discuss origin models and examine features which may
be reflective of a tilted thermal plume indicated in recent tomographic
studies. Our drive home will pass through Grand Teton National Park where
major activity on the Teton fault has resulted in the down-dropping of
Jackson Hole against the Teton Range in response to the passage of the
North American plate over the Yellowstone hot spot. We will return to
Denver from the Tetons arriving late Saturday, October 27, 2007.
Additional meeting information is available at:
http://www.geosociety.org/meetings/2007/
Any questions about this session should be sent to Lisa Morgan
(lmorgan@xxxxxxxx) or Ken Pierce (kpierce@xxxxxxxx).
thanks,
Lisa
Lisa A. Morgan U.S. Geological Survey
Research Geologist Denver Federal Center,
Box 25046, MS 966
lmorgan@xxxxxxxx Denver, CO 80225-004
phone: 303-273-8646
fax: 303-273-8600
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