Timing and extent of Neogene tectonic rotation in the western Transverse Ranges, California

Research Article| December 01, 1986 Timing and extent of Neogene tectonic rotation in the western Transverse Ranges, California J. SCOTT HORNAFIUS; J. SCOTT HORNAFIUS 1Department of Geological Sciences, University of California, Santa Barbara, California 93106 Search for other works by this author on: GSW Google Scholar BRUCE P. LUYENDYK; BRUCE P. LUYENDYK 1Department of Geological Sciences, University of California, Santa Barbara, California 93106 Search for other works by this author on: GSW Google Scholar R. R. TERRES; R. R. TERRES 1Department of Geological Sciences, University of California, Santa Barbara, California 93106 Search for other works by this author on: GSW Google Scholar M. J. KAMERLING M. J. KAMERLING 1Department of Geological Sciences, University of California, Santa Barbara, California 93106 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1986) 97 (12): 1476–1487. https://doi.org/10.1130/0016-7606(1986)97<1476:TAEONT>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation J. SCOTT HORNAFIUS, BRUCE P. LUYENDYK, R. R. TERRES, M. J. KAMERLING; Timing and extent of Neogene tectonic rotation in the western Transverse Ranges, California. GSA Bulletin 1986;; 97 (12): 1476–1487. doi: https://doi.org/10.1130/0016-7606(1986)97<1476:TAEONT>2.0.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 Paleomagnetic data collected from lower Miocene rocks throughout the western Transverse Ranges Province have consistently clockwise-deflected magnetic declinations, which suggests that the entire province has experienced clockwise tectonic rotation during Neogene time. Paleomagnetic declinations in lower Miocene rocks increase westward from 33.5C ± 11° in the San Gabriel block to 91.7° ± 7° in the western Santa Ynez Range, suggesting a westward increase in the net amount of clockwise tectonic rotation. Paleomagnetic data that constrain the tuning of rotation suggest that the entire western Transverse Ranges rotated uniformly 50°–60° clockwise during the middle Miocene. This implies a minimum of 200 km of distributed dextral shear along the California coast and offshore during middle Miocene time. Little tectonic rotation appears to have occurred in the western Transverse Ranges during late Miocene time. Since Miocene time, continued clockwise rotation in the western Santa Ynez Range (31.3°), combined with counterclockwise rotation in the San Gabriel block (−16°), has: oroclinally bent the Transverse Ranges to the west of the San Andreas fault. The Pliocene-Pleistocene clockwise rotation implies an additional 30–60 km of distributed dextral shear across the southern California Coast Ranges during post-Miocene time. 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.