VOLCANO: GSA Field Trip and Session

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GSA Field Trip and Session
From: Katharine Cashman cashman@xxxxxxxxxxx


This year’s national meeting of the Geological Society of America will be held in Portland Oregon on October 18-21, 2009.  In keeping with the meeting’s theme of “From Volcanoes to Vineyards”, we are organizing a number of special sessions and field trips that are at the cusp between geomorphology, volcanology, and hydrology.  The abstract deadline is August 11 and can be accessed at:  http://www.geosociety.org/meetings/2009/ . Events include:
1) Pre-meeting field trip (Oct 15-17):  Fire and Water: Volcanology, geomorphology, and hydrogeology of the Cascade Range, central Oregon.  Trip organizers:  Gordon Grant (US Forest Service/Oregon State University), Kathy Cashman and Natalia Deligne (University of Oregon), Marshall Gannett (USGS), and Anne Jefferson (UNC-Charlotte).
Description:  This trip will explore the interactions among the geology, volcanic history, hydrology, and fluvial geomorphology of the central Cascade Range in Oregon. This region offers an unparalleled opportunity to examine over 30 million years of landscape evolution in a young volcanic arc amidst spectacular natural scenery. Key topics to be examined include geologic control of hydrologic regimes on both the wet and dry side of the Cascade crest, groundwater dynamics and interaction between surface and groundwater in volcanic arcs, changing evolution of volcanic styles and products from the Miocene to the Holocene, and interactions between rivers and lava flows. We will also consider the history of and controls on channel incision. Along the way we will trace the Willamette River back to its source high in the Cascades and then follow the Deschutes River from its source downstream.
2)  Pardee Keynote Symposim (P8). The Evolution of Basaltic Landscapes: Time and the River and Lava Flowing:  Convenors: Gordon E. Grant, USDA Forest Service, Corvallis, Ore.; Katharine Cashman, University of Oregon, Eugene, Ore.; Oliver A. Chadwick, University of California, Santa Barbara, Calif.   Sun., 18 Oct., 8 a.m.–noon
This session will focus on the life and death of basaltic landscapes around the world, from lava-flow emplacement and dynamics to soil and hydrologic development, biological colonization, and channel incision and landscape evolution.  Although all talks are invited only, we are have arranged for poster submissions around this topic to be included in the poster session for Topical Session T-27 (described below).
3)  Special Topical Session (T-27):  "Hydrologic Characterization and Simulation of Neogene Volcanic Terranes".  Co-convenors:  Marshall Gannett (USGS) and Gordon Grant (US Forest Service).  Sponsor: GSA Hydrogeology Division.  Sunday, Oct. 18 (afternoon):
Description: Young volcanic terranes are commonly areas of high relief that intercept moisture from moving air masses. The resulting combination of permeable deposits and high precipitation makes these areas important sources of streamflow and ground-water recharge. But such terranes commonly have a high degree of heterogeneity, poorly characterized subsurface flow and soil properties, extreme hydrologic gradients, and uncertain hydrologic budgets, providing a particular challenge to researchers working to understand and model these systems. Hydrologic systems in young volcanic terranes are critical to many communities and regional economies, and understanding how such systems are likely to respond to development and changes in land-use and climate requires development of robust models that couple climatic, ground- and surface-water, and biologic processes. This session is intended to bring together researchers from the full range of disciplines important to understanding, quantifying, and modeling the hydrology of young volcanic terranes. In particular, researchers working on the atmospheric and biologic components of the hydrologic cycle are encouraged to submit talks.

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