Evidence for post-early Miocene initiation of movement on the Garlock fault from offset of the Cudahy Camp Formation, east-central California

Abstract

Research Article| March 01, 1997 Evidence for post-early Miocene initiation of movement on the Garlock fault from offset of the Cudahy Camp Formation, east-central California F. C. Monastero; F. C. Monastero 1Geothermal Program Office, Naval Air Weapons Station, China Lake, California 93555-6001 Search for other works by this author on: GSW Google Scholar A. E. Sabin; A. E. Sabin 1Geothermal Program Office, Naval Air Weapons Station, China Lake, California 93555-6001 Search for other works by this author on: GSW Google Scholar J. D. Walker J. D. Walker 2Geology Department, University of Kansas, Lawrence, Kansas 66045-2124 Search for other works by this author on: GSW Google Scholar Geology (1997) 25 (3): 247–250. https://doi.org/10.1130/0091-7613(1997)025<0247:EFPEMI>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation F. C. Monastero, A. E. Sabin, J. D. Walker; Evidence for post-early Miocene initiation of movement on the Garlock fault from offset of the Cudahy Camp Formation, east-central California. Geology 1997;; 25 (3): 247–250. doi: https://doi.org/10.1130/0091-7613(1997)025<0247:EFPEMI>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 SocietyGeology Search Advanced Search Abstract The Cudahy Camp Formation, located in the El Paso basin, east-central California, consists of a 350-m-thick volcanic and sedimentary sequence of early Miocene age. Previous investigators determined from paleocurrent indicators that the source for these rocks was to the south and southeast, but failed to suggest a specific location for that source. Restoration of 64 km of left slip on the Garlock fault places Cudahy Camp rocks north and northwest of the early Miocene Eagle Crags volcanic field. The unique geochemical nature of basalts found in both locations, coincident ages of volcanic rocks, identical clast content of volcanic tuffs, and identical stratigraphic sequence indicate that the source for the Cudahy Camp Formation was the Eagle Crags volcanic field. This is the first documented occurrence of Miocene rocks offset by the Garlock fault. Because the Cudahy Camp rocks and their sources appear to be offset by the full displacement on the Garlock fault, we conclude that movement on the Garlock started after earliest middle Miocene time. Further constraining initiation of movement on the Garlock fault adds significantly to fully understanding the evolution of the western North American plate boundary in the middle to late Cenozoic. 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.