Measuring vertical tectonic motion at the intersection of the Santa Cruz-Catalina Ridge and Northern Channel Islands platform, California Continental Borderland, using submerged paleoshorelines

Abstract

Research Article| July 01, 2008 Measuring vertical tectonic motion at the intersection of the Santa Cruz–Catalina Ridge and Northern Channel Islands platform, California Continental Borderland, using submerged paleoshorelines Jason D. Chaytor; Jason D. Chaytor † 1College of Oceanic and Atmospheric Sciences, Oregon State University, 104 Ocean Administration Building, Corvallis, Oregon 97331, USA §Present address: Department of Geology and Geophysics, Woods Hole Oceanographic Institution, MS 24, Woods Hole, Massachusetts 02543, USA. †E-mail: jchaytor@whoi.edu Search for other works by this author on: GSW Google Scholar Chris Goldfinger; Chris Goldfinger 1College of Oceanic and Atmospheric Sciences, Oregon State University, 104 Ocean Administration Building, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Melissa A. Meiner; Melissa A. Meiner 1College of Oceanic and Atmospheric Sciences, Oregon State University, 104 Ocean Administration Building, Corvallis, Oregon 97331, USA #Present address: Department of Geology, University of Hawaii at Hilo, 200 W. Kawili Street, Hilo, Hawaii 96720, USA. Search for other works by this author on: GSW Google Scholar Gary J. Huftile; Gary J. Huftile 2School of Natural Resource Sciences, Queensland University of Technology, 2 George Street, Brisbane, QLD 4001, Australia Search for other works by this author on: GSW Google Scholar Christopher G. Romsos; Christopher G. Romsos 3College of Oceanic and Atmospheric Sciences, Oregon State University, 104 Ocean Administration Building, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Mark R. Legg Mark R. Legg 4Legg Geophysical, Huntington Beach, California 92647, USA Search for other works by this author on: GSW Google Scholar GSA Bulletin (2008) 120 (7-8): 1053–1071. https://doi.org/10.1130/B26316.1 Article history received: 20 Aug 2007 rev-recd: 06 Feb 2008 accepted: 15 Feb 2008 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jason D. Chaytor, Chris Goldfinger, Melissa A. Meiner, Gary J. Huftile, Christopher G. Romsos, Mark R. Legg; Measuring vertical tectonic motion at the intersection of the Santa Cruz–Catalina Ridge and Northern Channel Islands platform, California Continental Borderland, using submerged paleoshorelines. GSA Bulletin 2008;; 120 (7-8): 1053–1071. doi: https://doi.org/10.1130/B26316.1 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 We used submerged paleoshorelines as strain markers to investigate Holocene and late Pleistocene vertical tectonic movement at the intersection of the offshore Santa Cruz–Catalina Ridge with the southern boundary of the Western Transverse Ranges, within the California Continental Borderland. Past submerged shoreline positions were identified using high-resolution multibeam bathymetry, side-scan sonar, submersible observations, and the presence of intertidal and subtidal invertebrate fossils. Numerous accelerator mass spectrometry (AMS) 14C ages of shells from these paleoshorelines were found to be between ~27,000 yr radiocarbon (RC) and 11,500 yr before present, indicative of shoreline colonization during and following the Last Glacial Maximum (LGM), establishing these paleoshorelines as a usable datum for measuring vertical change since this time. Removal of the nontectonic component of vertical change using an ice-volume-equivalent eustatic sea-level compilation indicates between 20 and 45 m of uplift of the eastern part of the Northern Channel Islands block since the LGM lowstand, resulting in an uplift rate of 1.50 ± 0.59 mm/yr over the last 23 k.y. This rate closely matches uplift predicted by published slip rates for the Channel Islands thrust, which underlies the Northern Channel Islands platform. Results from post-LGM shoreline features on Pilgrim Banks are somewhat more ambiguous. Submarine paleoshoreline uplift, together with the extensive upper-crustal fold-thrust style of deformation, illustrates the transpressional interaction of the Borderland and the Western Transverse Ranges blocks where the Santa Cruz–Catalina Ridge and northern Channel Islands intersect. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.