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Spatial and temporal variations in denudation of the Wasatch Mountains, Utah, USA

¹DIVISION OF RESOURCES MANAGEMENT AND SCIENCE, YOSEMITE NATIONAL PARK, EL PORTAL, CALIFORNIA 95318, USA
²SCHOOL OF EARTH AND ATMOSPHERIC SCIENCES, GEORGIA INSTITUTE OF TECHNOLOGY, ATLANTA, GEORGIA 30332–0340, USA
³DEPARTMENT OF GEOLOGICAL SCIENCES, UNIVERSITY OF MICHIGAN, ANN ARBOR, MICHIGAN 48109–1005, USA
⁴WILLIAM LETTIS AND ASSOCIATES, INC., AUGUSTA, GEORGIA 30901–0851, USA
⁵DEPARTMENT OF EARTH AND PLANETARY SCIENCES, UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA 94720–4767, USA, AND CENTRE EUROPÉEN DE RECHERCHE ET D'ENSELIGNEMENT DES GÉOSCIENCES DE L'ENVIRONNEMENT (CEREGE), 13545 AIX EN PROVENCE, FRANCE

View larger version (96K): [in this window] [in a new window]   Figure 1. Salt Lake City and Weber segments of Wasatch fault zone and adjacent Wasatch Mountains showing 10Be sample locations (this study), thermochronometer samples (Armstrong et al., 2003, 2004), and paleoseismic study sites (Machette et al., 1992; McCalpin and Nishenko, 1996; Nelson and Personius, 1993). Sampled catchments are colored according to their denudation rate. Tick marks on faults are located on the hanging wall. Horizontal, white, dashed line delineates boundary between Weber and Salt Lake City segments of Wasatch fault zone. Faults are from U.S. Geological Survey Quaternary Fault and Fold Database (http://earthquake.usgs.gov/regional/qfaults/). WS—Weber segment of the Wasatch fault zone, SLCS—Salt Lake City segment of the Wasatch fault zone; KC—Kays Creek North, HCN—Holmes Creek North, HC—Holmes Creek, SC—Shepards Creek, StC—Steed Creek, FC—Ford Canyon, CC—Centerville Canyon, HoC—Holbrook Creek, SG—Stairs Gulch, LF—Lisa Falls, TG—Tanner Gulch, CG—Coalpit Gulch, RC—Rocky Mouth Creek, BC—Bear Creek.

View larger version (32K): [in this window] [in a new window]   Figure 2. Spatial variation in catchment denudation, rock exhumation, and vertical fault displacement rates as a function of distance from the range front Wasatch fault. AHe-based exhumation rates, shown by white (Weber segment) and light gray (Salt Lake City segment) boxes, are from Armstrong et al. (2003, 2004) and Ehlers et al. (2003). Vertical fault displacement rates (dark gray box) are from Machette et al. (1992) and Friedrich et al. (2003).

View larger version (18K): [in this window] [in a new window]   Figure 3. Catchment-wide denudation rates derived from cosmogenic 10Be as a function of (A) catchment area, (B) mean elevation, (C) catchment relief, and (D) mean hillslope angle. Horizontal error bars represent 2 uncertainty in digital elevation model (DEM) analyses (Frankel and Pazzaglia, 2005); vertical error bars represent propagated 1 analytical uncertainty in 10Be-based denudation rates; where not shown, error bars are smaller than marker symbols.