Regional structure and kinematic history of the Sevier fold-and-thrust belt,central Utah:Discussion

摘要

DeCelles and Coogan (2006) summarize the structure and evolution of the Late Jurassic to Paleocene Sevier orogenic belt in central Utah,inferring at least 220 km of crustal shortening on the basis of a regional balanced cross section.Difficulties arise in an otherwise excellent synthesis in their treatment of the Sevier Desert basin,where 47 km of normal slip is interpreted on a Cenozoic detachment in spite of mounting evidence that no such structure exists (Anders and Christie-Bhck,1994;Hamilton,1994;Anders et al.,1995,1998,2001;Wills and Anders,1996,1999;Wills,2000;Hintze and Davis,2003;Wills et al.,2005;Christie-Bhck et al.,2007).