Quaternary rate of folding of the Ventura Avenue anticline, western Transverse Ranges, southern California

Research Article| June 01, 1988 Quaternary rate of folding of the Ventura Avenue anticline, western Transverse Ranges, southern California T. K. ROCKWELL; T. K. ROCKWELL 1Department of Geological Sciences, San Diego State University, San Diego, California 92182 Search for other works by this author on: GSW Google Scholar E. A. KELLER; E. A. KELLER 2Department of Geological Sciences, University of California, Santa Barbara, California 93106 Search for other works by this author on: GSW Google Scholar G. R. DEMBROFF G. R. DEMBROFF 3U.S Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Author and Article Information T. K. ROCKWELL 1Department of Geological Sciences, San Diego State University, San Diego, California 92182 E. A. KELLER 2Department of Geological Sciences, University of California, Santa Barbara, California 93106 G. R. DEMBROFF 3U.S Geological Survey, Menlo Park, California 94025 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1988) 100 (6): 850–858. https://doi.org/10.1130/0016-7606(1988)100<0850:QROFOT>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation T. K. ROCKWELL, E. A. KELLER, G. R. DEMBROFF; Quaternary rate of folding of the Ventura Avenue anticline, western Transverse Ranges, southern California. GSA Bulletin 1988;; 100 (6): 850–858. doi: https://doi.org/10.1130/0016-7606(1988)100<0850:QROFOT>2.3.CO;2 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 SocietyGSA Bulletin Search Advanced Search Abstract Upper Quaternary terraces of the Ventura River, California, are uplifted, tilted, and folded over the Ventura Avenue anticline. Rates of uplift and tilting have decreased since inception of the structure over the past 200 ka. Assuming that the chronology, based on amino-acid racemization, 14C dates, and soils correlation, is approximately correct, then the minimum possible average rate of uplift in the axial region of the fold has decreased from ∼14 mm/yr to 2 mm/yr during the past 200 ka. Interval rates of uplift for the periods 200 ka to 80 or 105 ka, 80 or 105 ka to 30 ka, and 30 ka to present are, respectively, about 20 mm/yr, 9 mm/yr, and 5 mm/yr. The rate of tilting shows a similar trend, decreasing from ∼5.8 urad/yr, 2.5 urad/yr, and 1.2 urad/yr for the same time intervals, respectively. Based on the mechanics of flexural slip folds in stratified sedimentary rocks, these data suggest that the rootless Ventura Avenue anticline is a fold that has been shortening at a relatively constant rate of about 9 mm/yr since its inception. 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.