Portal de Periódicos da CAPES

Geometry, timing, and continuity of the Rock Springs uplift, Wyoming, and Douglas Creek arch, Colorado: Implications for uplift mechanisms in the Rocky Mountain foreland, U.S.A.

2005; University of Wyoming; Volume: 40; Issue: 2 Linguagem: Inglês

10.2113/40.2.167

0010-7980

S. Mederos,

Geological formations and processes

Research Article| January 01, 2005 Geometry, timing, and continuity of the Rock Springs uplift, Wyoming, and Douglas Creek arch, Colorado : Implications for uplift mechanisms in the Rocky Mountain foreland, U.S.A. Selena Mederos; Selena Mederos 1Department of Geology and Geophysics, University of Wisconsin – Madison, 1215 W. Dayton St., Madison, WI 53706 U.S.A.3Present address: BP America Inc, P.O. Box 3092, 501 WestLake Park Blvd, Houston Texas 77079, U.S.A. Search for other works by this author on: GSW Google Scholar Basil Tikoff; Basil Tikoff * 1Department of Geology and Geophysics, University of Wisconsin – Madison, 1215 W. Dayton St., Madison, WI 53706 U.S.A. *Correspondence should be addressed to: basil@geology.wisc.edu Search for other works by this author on: GSW Google Scholar Viki Bankey Viki Bankey 2United States Geological Survey, MS 964, Denver Federal Center, Denver, CO 80225, U.S.A. Search for other works by this author on: GSW Google Scholar Rocky Mountain Geology (2005) 40 (2): 167–191. https://doi.org/10.2113/40.2.167 Article history received: 23 Mar 2005 rev-recd: 27 Sep 2005 accepted: 14 Oct 2005 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 Selena Mederos, Basil Tikoff, Viki Bankey; Geometry, timing, and continuity of the Rock Springs uplift, Wyoming, and Douglas Creek arch, Colorado : Implications for uplift mechanisms in the Rocky Mountain foreland, U.S.A.. Rocky Mountain Geology 2005;; 40 (2): 167–191. doi: https://doi.org/10.2113/40.2.167 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyRocky Mountain Geology Search Advanced Search Abstract The Rock Springs uplift of Wyoming and the Douglas Creek arch of Colorado are intrabasinal, Laramide-age basement uplifts within the Rocky Mountain foreland, and are currently separated by the east–west-trending Uinta Mountains. The geometry, timing, and progressive development of these uplifts were investigated using a combined geophysical and geological approach. New gravity surveys were combined with existing regional data to provide a regional Bouguer gravity anomaly map of these two uplifts and the intervening Uinta uplift. The gravity data show a distinct and continuous north–south-striking gravity high along the trend of the two uplifts that crosses the east–west-trending Uinta uplift. The relatively constant amplitude (∼40 mGal) of the gravity anomaly indicates that the inferred basement relief is similar for both arches (∼4 km). Sedimentation patterns indicate that the Rock Springs uplift and Douglas Creek arch formed simultaneously in the Late Cretaceous.The intrabasinal setting of the uplifts records aspects of foreland deformation that are overprinted or obscured in better-developed uplifts. On the local scale, neither the Rock Springs or Douglas Creek uplift apparently reactivates a pre-existing structure. On a regional scale, there is no change in structural style or timing of the two uplifts, despite their formation in different crustal provinces. The Rock Springs uplift occurs within the Archean Wyoming province north of the Cheyenne belt, whereas the Douglas Creek arch occurs in Proterozoic crust south of this boundary. Timing relations, available from the basinal stratigraphy, indicate the uplifts were initiated as broad arches in the Late Cretaceous before developing into more concentrated uplifts. Thus, large-scale folding, and not reactivation of pre-existing structures, may be the primary control on the initial pattern of north- to northwest-trending foreland deformation. You do not currently have access to this article.