Sackungen at the Aspen Highlands Ski Area, Pitkin County, Colorado
Abstract
Research Article| January 01, 1995 Sackungen at the Aspen Highlands Ski Area, Pitkin County, Colorado JAMES P. McCALPIN; JAMES P. McCALPIN GEO-HAZ Consulting, Inc., P. O. Box 1377, Estes Park, CO 80517 Search for other works by this author on: GSW Google Scholar JAMES R. IRVINE JAMES R. IRVINE Consulting Soil Scientist 182 County Road 24, Ridgway, CO 81432 Search for other works by this author on: GSW Google Scholar Environmental & Engineering Geoscience (1995) I (3): 277–290. https://doi.org/10.2113/gseegeosci.I.3.277 Article history first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation JAMES P. McCALPIN, JAMES R. IRVINE; Sackungen at the Aspen Highlands Ski Area, Pitkin County, Colorado. Environmental & Engineering Geoscience 1995;; I (3): 277–290. doi: https://doi.org/10.2113/gseegeosci.I.3.277 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEnvironmental & Engineering Geoscience Search Advanced Search Abstract Numerous linear geomorphic features of suspected gravitational spreading origin, collectively termed sackungen, occur at elevations of 3,475–3,775 m at the head of the Aspen Highlands Ski Area near Aspen, Colorado. Features include double-crested ridges, upslope-facing scarps, linear troughs, and downslope-facing scarps. Most features are aligned with the prominent joint set (strike N25°–45°E, dip 80°–90° NW) that parallels the flanking, 1,150-m deep U-shaped glacial valleys of Castle and Maroon creeks. A backhoe trench 6 m long and 2 m deep was excavated across an upslope-facing scarp and adjacent trough to reveal the style and age of surface deformation. Sandstone bedrock of the Maroon Formation was extensively fractured under the scarp face, with abundant dilational voids. Hillslope colluvium was truncated at the main sackung fault plane, and was overlain by up to 1.2 m of fine-grained sag pond sediments. Seven buried soils were present in the trough fill, composed of A, and E or Bw horizons; A horizons at 35 cm, 84 cm, and 98 cm below the surface yield uncorrected 14C ages of 3060+150, 6290+70, and 7910+80 14C yrs B.P., respectively. Extrapolation of deposition rates to the base of the fill indicates that the trough formed ca. 11–11.5 ka, several thousand years after glacial ice had melted from the flanking glacial valleys. Trench stratigraphy suggests that slow vertical offset across the trough has continued since 11 ka, at rates of 0.14–0.75 mm/yr, perhaps accompanied by horizontal spreading at 0.43 mm/yr in the past 3 ka. This rate of spreading is slower than the 1–5 mm/yr measured by Varnes and others (1990) across sackungen in the Sawatch Range to the east, but still constitutes a constraint on foundation design for buildings and lift towers. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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