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Field Guides Downloaded from fieldguides.gsapubs.org on August 1, 2011 Field Guides Fire and water: Volcanology, geomorphology, and hydrogeology of the Cascade Range, central Oregon Katharine V. Cashman, Natalia I. Deligne, Marshall W. Gannett, Gordon E. Grant and Anne Jefferson Field Guides 2009;15;539-582 doi: 10.1130/2009.fld015(26) Email alerting services click www.gsapubs.org/cgi/alerts to receive free e-mail alerts when new articles cite this article Subscribe click www.gsapubs.org/subscriptions/ to subscribe to Field Guides Permission request click http://www.geosociety.org/pubs/copyrt.htm#gsa to contact GSA Copyright not claimed on content prepared wholly by U.S. government employees within scope of their employment. Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in subsequent works and to make unlimited copies of items in GSA's journals for noncommercial use in classrooms to further education and science. This file may not be posted to any Web site, but authors may post the abstracts only of their articles on their own or their organization's Web site providing the posting includes a reference to the article's full citation. GSA provides this and other forums for the presentation of diverse opinions and positions by scientists worldwide, regardless of their race, citizenship, gender, religion, or political viewpoint. Opinions presented in this publication do not reflect official positions of the Society. Notes © 2009 Geological Society of America Downloaded from fieldguides.gsapubs.org on August 1, 2011 The Geological Society of America Field Guide 15 2009 Fire and water: Volcanology, geomorphology, and hydrogeology of the Cascade Range, central Oregon Katharine V. Cashman Natalia I. Deligne Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403, USA Marshall W. Gannett U.S. Geological Survey, Oregon Water Science Center, Portland, Oregon 97201, USA Gordon E. Grant Pacifi c Northwest Research Station, U.S. Department of Agriculture (USDA), Forest Service, Corvallis, Oregon 97331, USA Anne Jefferson Department of Geography and Earth Sciences, University of North Carolina at Charlotte, Charlotte, North Carolina 28223, USA ABSTRACT This fi eld trip guide explores the interactions among the geologic evolution, hydrology, and fl uvial geomorphology of the central Oregon Cascade Range. Key topics include the geologic control of hydrologic regimes on both the wet and dry sides of the Cascade Range crest, groundwater dynamics and interaction between surface and groundwater in young volcanic arcs, and interactions between rivers and lava fl ows. As we trace the Willamette and McKenzie Rivers back to source springs high in the young volcanic rocks of the Cascade Range, there is abundant evidence for the large permeability of young lava fl ows, as manifested in streams that dewater into lava fl ows, lava-dammed lakes in closed basins, and rivers that emerge from single springs. These dynamics contrast sharply with the older, lower permeability Western Cascades terrane and associated runoff-dominated fl uvial systems. On the east side of the Cascades we encounter similar hydrologic characteristics resulting in complex interactions between surface water and groundwater as we follow the Deschutes River downstream to its confl uence with the Crooked River. Here, deep canyons have cut through most of the permeable part of the geologic section, have been invaded by multiple large intracanyon lava fl ows, and are the locus of substan- tial regional groundwater discharge. The groundwater and surface-water interaction in the Deschutes Basin is further complicated by surface-water diversions and an extensive network of leaking irrigation canals. Our west-to-east transect offers an unparalleled opportunity to examine the co-evolution of the geology and hydrology of an active volcanic arc. Cashman, K.V., Deligne, N.I., Gannett, M.W., Grant, G.E., and Jefferson, A., 2009, Fire and water: Volcanology, geomorphology, and hydrogeology of the Cascade Range, central Oregon, in O’Connor, J.E., Dorsey, R.J., and Madin, I.P., eds., Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacifi c Northwest: Geological Society of America Field Guide 15, p. 539–582, doi: 10.1130/2009.fl d015(26). For permission to copy, contact editing@geosociety. org. ©2009 The Geological Society of America. All rights reserved. 539 Downloaded from fieldguides.gsapubs.org on August 1, 2011 540 Cashman et al. INTRODUCTION AND TRIP OVERVIEW (left), one can see the foothills of the Western Cascades, and, if the day is clear, an occasional glimpse of the large stratovolcanoes The Cascade Range of Oregon is the result of ~40 million along the crest of the High Cascades. Along the way, we will cross years of evolution of an active volcanic arc located on the leading several large rivers draining the Coast and Cascade Ranges. edge of a continental plate downwind of an enormous source of At Eugene, we will turn east and follow the McKenzie River, moisture—the Pacifi c Ocean. The focus of our trip will be the a major tributary of the Willamette River. The McKenzie River interplay among these factors, particularly as expressed in the and its tributaries, Lost Creek and White Branch, will lead us to recent (Quaternary) history and styles of volcanism associated the crest of the Cascade Range at McKenzie Pass. The stops on with the convergent plate margin just offshore, the fl ow paths and Day 1 are intended to display aspects of the regional geology, volumes of groundwater systems located within the range, and climatology, and landscape history, including the striking con- the geomorphic evolution of rivers that have developed on both trast between the Western and High Cascades geology, topogra- sides of the Cascade Range crest. phy and dissection patterns, features and styles of Holocene lava This is very much a “West- and East-side story.” The north- fl ows, westside Cascade Range spring systems, and various ero- trending Cascade Range is perpendicular to the path of the pre- sional processes, including glacial erosion and mass movements. vailing westerly winds, creating a strong orographic lift and rain We will spend the night at the H.J. Andrews Experimental Forest, shadow effect. Precipitation on the windward western slopes of a National Science Foundation (NSF)–funded Long-Term Eco- the Cascades ranges from 2000 to over 4000 mm per year. On the logical Research site, which is surrounded by magnifi cent old- leeward east side, precipitation drops tenfold to around 300 mm growth forest. per year, resulting in one of the steepest precipitation gradients On the morning of the second day, we will continue along the in the United States. The topography, hydrogeology, vegetation, McKenzie River to its source at Clear Lake, stopping to observe and landscape evolution refl ect this sharp contrast in precipitation spectacular waterfalls, lava-fi lled canyons, and dry riverbeds. At and provide a unique natural laboratory for examining both geo- Clear Lake, which owes its origin to a lava fl ow that dammed the logic and climatic controls on landscape development. river, we will board rowboats for the short crossing to the Great Our trip will begin in Portland and proceed south through the Spring, a high-volume cold spring emanating from the base of Willamette Valley toward the headwaters of the Willamette River a late Holocene lava fl ow, and discuss different river and lava (Fig. 1). As we travel south on Interstate 5, to the west (right) across fl ow interactions. We will then drive over Santiam Pass, stopping the broad valley fl oor rises the Oregon Coast Range, an uplifted to observe a range of young volcanic structures and styles and and dissected continental shelf of early Tertiary age. To the east another very large spring and river system, the Metolius River. 124°0'W 123°40'W 123°20'W 123°0'W 122°40'W 122°20'W 122°0'W 121°40'W 121°20'W 121°0'W 45°0'N 45°0'N 22 Salem 26 97 22 44°40'N 44°40'N Madras 20 Legend 97 Day 1 126 26 20 20 44°20'N 44°20'N Day 2 Redmond 126 126 Day 3 Sisters 126 242 20 97 126 Bend Eugene 44°0'N 126 44°0'N 20 58 km 0420 080 97 124°0'W 123°40'W 123°20'W 123°0'W 122°40'W 122°20'W 122°0'W 121°40'W 121°20'W 121°0'W Figure 1. Map of northwestern Oregon showing fi eld trip route and locations of individual stops for each day, plus areas cov- ered by more detailed maps for each day of the fi eld trip. Downloaded from fieldguides.gsapubs.org on August 1, 2011 Volcanology, geomorphology, and hydrogeology of the Cascade Range 541 We will end the day at Bull Flat and Tumalo Dam, with an intro- been locally altered by hydrothermal processes, particularly in duction to the east side story. Overnight will be in Bend, Oregon. the contact aureoles surrounding granitic stocks. The landscape The third and fi nal day of our trip will begin with a focus on has been covered repeatedly by montane glaciers, dissected by lava and river interactions in the vicinity of Lava Butte, a Holo- rivers, and is prone to frequent mass wasting by landslides, debris cene cinder cone that was the source of lava fl ows that encroached fl ows, and earthfl ows. Consequently, the topography is extremely on, and temporarily dammed, the Deschutes River. We will then rugged, ranging in elevation from 200 to 1800 m, with sharp dis- travel north along the Deschutes River from Bend, where the river sected ridges, and steep slopes of 30° or more.
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