Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Web of Science (1) Google Scholar Articles by Strecker, M.R. Articles by Sobel, E.R. GeoRef GeoRef Citation

Does the topographic distribution of the central Andean Puna Plateau result from climatic or geodynamic processes?

M.R. Strecker^1,*, R. Alonso², B. Bookhagen³, B. Carrapa⁴, I. Coutand^5,, M.P. Hain¹, G.E. Hilley⁵, E. Mortimer⁶, L. Schoenbohm⁷ and E.R. Sobel¹

¹ Institut für Geowissenschaften, Universität Potsdam, 14476 Potsdam, Germany
² Universidad Nacíonal de Salta, 4400 Salta, Argentina
³ Geography Department, University of California–Santa Barbara, Santa Barbara, California 93106, USA
⁴ Department of Geology, University of Wyoming, Laramie, Wyoming 82071, USA
⁵ Université des Sciences et Technologies de Lille 1, Laboratoire Géosystèmes, 59655 Villeneuve d'ascq, France
⁶ School of Earth and Environment, Leeds University, Leeds LS21 1AH, UK
⁷ School of Earth Sciences, The Ohio State University, Columbus, Ohio 43210, USA

Correspondence: *E-mail: strecker{at}geo.uni-potsdam.de.

Orogenic plateaus are extensive, high-elevation areas with low internal relief that have been attributed to deep-seated and/or climate-driven surface processes. In the latter case, models predict that lateral plateau growth results from increasing aridity along the margins as range uplift shields the orogen interior from precipitation. We analyze the spatiotemporal progression of basin isolation and filling at the eastern margin of the Puna Plateau of the Argentine Andes to determine if the topography predicted by such models is observed. We find that the timing of basin filling and reexcavation is variable, suggesting nonsystematic plateau growth. Instead, the Airy isostatically compensated component of topography constitutes the majority of the mean elevation gain between the foreland and the plateau. This indicates that deep-seated phenomena, such as changes in crustal thickness and/or lateral density, are required to produce high plateau elevations. In contrast, the frequency of the uncompensated topography within the plateau and in the adjacent foreland that is interrupted by ranges appears similar, although the amplitude of this topographic component increases east of the plateau. Combined with sedimentologic observations, we infer that the low internal relief of the plateau likely results from increased aridity and sediment storage within the plateau and along its eastern margin.