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Geology.Gsapubs.Org on December 18, 2009 Downloaded from geology.gsapubs.org on December 18, 2009 Geology The stable isotope altimeter: Do Quaternary pedogenic carbonates predict modern elevations? Gregory D. Hoke, Carmala N. Garzione, Diego C. Araneo, Claudio Latorre, Manfred R. Strecker and Kendra J. Williams Geology 2009;37;1015-1018 doi: 10.1130/G30308A.1 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 Geology 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 geology.gsapubs.org on December 18, 2009 The stable isotope altimeter: Do Quaternary pedogenic carbonates predict modern elevations? Gregory D. Hoke1,2,3*, Carmala N. Garzione1, Diego C. Araneo2, Claudio Latorre4,5, Manfred R. Strecker3, and Kendra J. Williams1 1Department or Earth and Environmental Sciences, 227 Hutchinson Hall, University of Rochester, Rochester, New York 14627, USA 2Instituto Argentino de Nivología Glaciología y Ciencias Ambientales (IANIGLA), CCT (Centro Cientifi co Tecnológico), Ruíz Leal s/n, 5500 Mendoza, Argentina 3Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 24, Haus 27, 14476, Potsdam, Germany 4Center for Advanced Studies of Ecology and Biodiversity, Departamento de Ecología, Pontifi cia Universidad Católica de Chile, Alameda 340, Santiago, Chile 5Institute of Ecology and Biodiversity, Las Palmeras 3425, Santiago, Chile δ18 ABSTRACT the Orw-elevation gradient could result from (1) evaporative effects Stable isotope altimetry is a useful tool for estimating in the surface water, (2) changes in moisture transport pathways related paleoelevation in sedimentary records. Yet questions remain to secular climatic variations, and/or (3) changes in the initial isotopic regarding how source moisture, climate, and local topography can composition of the air mass incident on the mountain front. These factors infl uence these estimates. Here we present stable isotope altimetry must be considered when applying the modern gradient for paleoelevation results on late Quaternary pedogenic carbonates of known elevation estimates (Rowley and Garzione, 2007), and have served as the focal point on both fl anks of the Andean orogen at 33°S. We measured δ18O for criticisms of paleoaltimetry studies (e.g., Ehlers and Poulsen, 2009). values of pedogenic carbonates and river water samples from small Given the potential sources of uncertainty in applying stable isotopes as an drainages at regular elevation increments within the Río Aconcagua altimeter, we test the method in a modern system with data from river water (Chile) and Río Mendoza (Argentina) catchments. The δ18O values and Quaternary pedogenic carbonates, from the same catchments, along an of river waters correlate well with elevation and show similar east-west transect across the southern central Andes (33°S). isotopic gradients between the Chilean (−3.7‰ / km) and Argentine (−4.8‰ / km) sides of the range. Uncertainties associated with scatter BACKGROUND in the river water data and assumptions about the temperature of Our study area is located in two catchments that drain the high carbonate formation indicate that elevation estimates have 1σ errors Andes at ~33°S, the Río Aconcagua and Río Mendoza basins that drain of 350–450 m. We estimate the isotopic composition of soil water from into the Pacifi c and Atlantic, respectively (Fig. 1). The area encompasses pedogenic carbonates on both sides of the range by assuming mean the Chilean Precordillera, Central Valley, Principal Cordillera, Frontal annual temperatures based the modern temperature lapse rate from meteorological station data. Combined, our data show that stable isotope altimetry produces reasonable estimates of modern elevation, with the majority of our samples (60%) within the 1σ uncertainties and 77% within 2σ. INTRODUCTION Stable isotope paleoaltimetry has emerged as a powerful tool for determining the spatiotemporal evolution of topography in mountain belts (e.g., Chamberlain et al., 1999; Garzione et al., 2000; Rowley et al., 2001; Mulch et al., 2006; Poage and Chamberlain, 2002;). Paleoelevation is a key parameter necessary for testing different geodynamic models of orogenesis (Molnar and England 1990) and potentially for testing the geomorphic response time to surface uplift. Topographic reconstruction by stable isotope paleoaltimetry relies on pedogenic or biogenic minerals as proxies for the composition of meteoric water. Stable O or H isotopes in pedogenic carbonate, pedogenic clays, biogenic apatite, biogenic carbonates, and plant organic matter are all potential paleoaltimeters. Stable isotope–based paleoaltimetry studies also δ18 δ18 use the modern gradient in O values of meteoric water ( Omw) and δ18 elevation, as well as past differences in the modeled Omw-altitude gradient (Rowley and Garzione, 2007). The isotopic composition of river water δ18 ( Orw)-elevation gradient is constrained by elevation transects of river water sampled from small subbasins of large catchments (e.g., Garzione δ18 et al., 2000). The resulting Orw is used as a proxy for constraining an Figure 1. Shaded relief map of South American continent between δ18 20° and 40°S. Vapor transport directions calculated at 850 hPa from empirical relationship for Omw versus altitude. This relationship is used to calculate elevation from surface water compositions derived National Centers for Environmental Prediction (NCEP 1) reanalysis data for period 1968–1996 for austral winter (blue) and summer (red). from carbonates, clays, and/or organic matter. Major sources of error in Río Aconcagua and Río Mendoza watersheds are indicated with thin black line and yellow shading, respectively. Cross section in *Current address: Department of Earth Sciences, 204 Heroy Geology Labora- Figure 2 is taken from area within dashed box. tory, Syracuse University, Syracuse, NY 13244, USA; E-mail: [email protected]. © 2009 Geological Society of America. For permission to copy, contact Copyright Permissions, GSA, or [email protected]. GEOLOGY,Geology, November November 2009; 2009 v. 37; no. 11; p. 1015–1018; doi: 10.1130/G30308A.1; 3 fi gures; Data Repository item 2009256. 1015 Downloaded from geology.gsapubs.org on December 18, 2009 Cordillera, and Argentine Precordillera morphotectonic provinces. The DATA AND RESULTS Argentine Precordillera has an average crest elevation of 2.5 km, and We collected stage I pedogenic carbonates from the undersides the Principal and Frontal Cordilleras have maximum average elevations of conglomerate clasts in incipient soil exposures along with water of 4.2 km (Fig. 2). The western slope is a much steeper, narrower front samples from the adjacent Río Mendoza (Argentina) and Río Aconcagua compared to the eastern slope. There is no evidence for signifi cant (Chile) watersheds (Fig. 1). The isotopic composition of all samples was Quaternary elevation change in the high Andes. determined at the University of Rochester’s SIREAL (Stable Isotope The Andes constitute an orographic barrier to atmospheric Ratios in the Environment Analytical Laboratory; also see the Data and circulation, which directly infl uences the isotopic composition of Analytical Methods section of the GSA Data Repository1) precipitation. Atmospheric circulation and precipitation are dominated Tributary water samples with drainage areas ≤100 km2 were collected by the westerlies in austral winter and by the subtropical high-pressure in ~100 m vertical increments along the trunk river. The 12 Río Aconcagua belt in austral summer (Bluestein, 1993). The central part of Chile is samples were collected in early April of 2007 and the principal suite (n = semiarid (~400 mm/a; Falvey and Garreaud, 2007), whereas in central- 17) from the Río Mendoza’s tributaries was sampled in January 2007. In western Argentina, climate conditions progress from arid (<200 mm/a) September 2007 two sites from the initial Río Mendoza sampling were in the northwest to semiarid in the southeast (200–300 mm/a) resampled and one new site added (Fig. 2). δ18 δ18 (Hoffmann, 1992). We assume that Orw refl ects an annual integration of Omw across During austral winter, the subtropical Pacifi c anticyclone weakens the entire relief of the sampled catchments, which is best represented by and is displaced northward, enhancing westerly fl ow across the Andes, the average elevation of each catchment. Using river networks extracted producing a precipitation maximum over the western slopes (Saavedra and from
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