Late Oligocene to Present Contractional Structure in and Around the Susitna Basin, Alaska—Geophysical Evidence and Geological GEOSPHERE; V
Research Paper THEMED ISSUE: Geologic Evolution of the Alaska Range and Environs GEOSPHERE Late Oligocene to present contractional structure in and around the Susitna basin, Alaska—Geophysical evidence and geological GEOSPHERE; v. 12, no. 5 doi:10.1130/GES01279.1 implications R.W. Saltus1,*, R.G. Stanley2, P.J. Haeussler3, J.V. Jones III3, C.J. Potter4, and K.A. Lewis1 7 figures; 1 supplemental file 1U.S. Geological Survey, Denver Federal Center, Denver, Colorado 80225, USA 2U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025, USA CORRESPONDENCE: rick .saltus@ noaa .gov 3U.S. Geological Survey, 4210 University Drive, Anchorage, Alaska 99508-4626, USA 4U.S. Geological Survey, Piscataway, New Jersey 08854, USA CITATION: Saltus, R.W., Stanley, R.G., Haeussler, P.J., Jones, J.V., III, Potter, C.J., and Lewis, K.A., 2016, Late Oligocene to present contractional structure in ABSTRACT morphic rocks of the Talkeetna Mountains, and on the southeast by the Castle and around the Susitna basin, Alaska—Geophysical Mountain strike-slip fault. evidence and geological implications: Geosphere, The Cenozoic Susitna basin lies within an enigmatic lowland surrounded Existing structural information for the basin is sparse; aside from the Castle v. 12, no. 5, p. 1378–1390, doi:10.1130/GES01279.1. by the Central Alaska Range, Western Alaska Range (including the Tordrillo Mountain fault, none of the bounding structures are exposed. Subsurface data Mountains), and Talkeetna Mountains in south-central Alaska. Some previ- consist of a modest number of vintage seismic lines (e.g., Lewis et al., 2015) Received 1 October 2015 Revision received 8 June 2016 ous interpretations show normal faults as the defining structures of thebasin and a few wells, none of which drilled deep enough to reach crystalline base- Accepted 6 July 2016 (e.g., Kirschner, 1994).
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