2019 GSA Cordilleran Section

115th Annual Meeting

15–17 May 2019 | Portland, Oregon USA

Oregon Convention Center

FIELD TRIPS

Trip registration will open in February 2019. For additional information, please contact the Field Trip Chair.

401. Flood Basalts, Rhyolites, and Pre- to Postdating Volcanism of the Columbia River Province in Eastern Oregon.
Sat.-Tues., 11-14 May.
Cost: US$481 (includes all lunches, hotels, van transportation, handouts, possibly one dinner). Maximum number of participants: 23.
Martin J. Streck, Portland State Univ.; Mark L Ferns, Eastern Oregon Univ.; Emily Cahoon, Portland State Univ.

This field trip will explore volcanism of mid-Miocene silicic centers and nearby lavas of the Columbia River Basalt as well as volcanism pre- and postdating flood basalts. Recent work on abundant rhyolites of eastern Oregon and neighboring states led to the recognition that the Columbia River Basalt province is strongly bi-modal in character, contrary to traditional views.

402. The Columbia River Basalt in the western Columbia Basin and Columbia River Gorge. (Canceled)
Mon–Tues., 13–14 May.

403. Volcanism, Sedimentation, and Tectonics in the Hood River Graben: A Pliocene to Quaternary Intra-Arc Half Graben in the Northern Oregon Cascade Range.
Mon.–Tues., 13–14 May.
Cost: US$278 (includes two lunches, overnight stay at the historic Balch Hotel in Dufur, Oregon, van transportation, handouts). Maximum number of participants: 16.
Jason D. McClaughry and Clark Niewendorp, Oregon DOGAMI; Joshua Hackett, Oregon Water Res. Dept., and Richard M. Conrey, Hamilton College.

This field trip will visit the Hood River graben, a late Pliocene–Quaternary intra-arc graben situated across the High Cascade Range of northern Oregon. Field sites will focus on the stratigraphic-geochemical-structural details of late Miocene and younger volcanics and their intimate relationship with development of the graben.

404. Landslides in the Columbia River Gorge.
Tues., 14 May.
Cost: US$117 (includes lunch, snacks, bus transportation, handouts). Maximum number of participants: 50.
William J. Burns and Nancy Calhoun, Oregon DOGAMI; Trevor Contreras, Kara Jacobacci, Kate Mickelson, and Will Gallin, Washington Geol. Survey.

Landslides are widespread in the Columbia River Gorge. This field trip will visit recently burned, active debris flow fans, giant deep-seated landslides, and rock fall sites. New mapping in Washington and Oregon expand our understanding of the landslide hazard and risk to infrastructure along the Columbia River.

405. Columbia River Basalt Hydrology and Management Solutions in the Mosier Basin, Oregon.
Sat., 18 May.
Cost: US$76 (includes lunch, van transportation, handouts). Maximum number of participants: 30.
Kenneth E. Lite Jr., Oregon Water Res. Dept.; Robert B. Perkins, Portland State Univ.; Erik A. Thomasser, Jonathan L. LaMarche, and Aurora C. Bouchier, Oregon Water Res. Dept.

Explore the structure, flood basalt depositional environments, and landscape development that formed a groundwater flow system in the eastern Columbia River Gorge, where past well construction practices and overuse have severely depleted parts of the system. Learn about hydrogeologic and management techniques being used to address aquifer depletion.

406. Mount St. Helens—Its 1980 Eruption and 39 Years of Post-Eruption Recovery.
Sat., 18 May.
Cost: US$141 (includes lunch, snacks, bus transportation, and entry fee to Johnston Ridge Observatory, rental fee for Coldwater Science and Learning Center, handouts). Maximum number of participants: 50.
Jon Major, USGS.

On this trip, we will visit the Toutle River valley, which bore the brunt of the Mount St. Helens 1980 eruption. We will discuss the volcanic processes and impacts of the eruption, and the hydrologic, geomorphic, and ecologic responses to those eruptive impacts.

407. Terroir of Wine: Relationship of Wine to Soils, Geology, and Climate.
Sat., 18 May.
Cost: US$141 (includes lunch, snacks, minibus transportation, tasting fees, handouts). Maximum number of participants: 26.
Scott Burns, Portland State Univ.

This trip will visit three wineries to taste the differences in terroir of the Willamette Valley. Terroir is the relationship between grapes, soil, geology, climate, soil biota, water-holding capacity, and elevation/slope orientation. We will talk about the impact of wine makers and vineyard managers on the terroir. The Willamette Valley has three major soil types, which create different flavors in the pinot noir and Riesling wines of the valley: basalt soils (Jory Series), marine sediment soils (Willakenzie Series), and basalt soils with pisolites from the weathering of loess (Laurelwood Series). The Willamette Valley is the best place in the world to taste different flavors of terroir, all because of the three different parent materials.

408. Rice Museum of Rocks and Minerals. (Canceled)
Sat., 18 May.

409. Active Tectonics and Bedrock Geology of the North American Plate at the Latitude of the Columbia River: A Field Trip to Recognize the Contributions of Ray Wells and Rick Blakely— the Dynamic Duo of Pacific Northwest Geology and Geophysics.
Fri.–Sun., 17–19 May.
Cost: US$455 (includes all lunches, handouts, hotel, van transportation). Maximum number of participants: 27.
Andrew Meigs, Oregon State Univ.; Ray E. Wells, USGS; Richard Blakely, USGS; Joanna Redwine, USBR; Scott Bennett, USGS.

This field trip honors the careers of Ray Wells and Rick Blakely. To showcase the breadth and impact of their work, the field trip explores the crustal structure, bedrock geology, basins, and active faults from the coast across the northern Oregon Coast Range to the Tualatin Valley.