Footwall drainage evolution and scarp retreat in response to increasing fault displacement: Loreto fault, Baja California Sur, Mexico

Abstract

Research Article| July 01, 2007 Footwall drainage evolution and scarp retreat in response to increasing fault displacement: Loreto fault, Baja California Sur, Mexico Estelle Mortimer; Estelle Mortimer 1Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 25, Potsdam D-14476, Germany Search for other works by this author on: GSW Google Scholar Barbara Carrapa Barbara Carrapa 1Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 25, Potsdam D-14476, Germany Search for other works by this author on: GSW Google Scholar Geology (2007) 35 (7): 651–654. https://doi.org/10.1130/G23690A.1 Article history received: 25 Jan 2007 rev-recd: 28 Feb 2007 accepted: 04 Mar 2007 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Estelle Mortimer, Barbara Carrapa; Footwall drainage evolution and scarp retreat in response to increasing fault displacement: Loreto fault, Baja California Sur, Mexico. Geology 2007;; 35 (7): 651–654. doi: https://doi.org/10.1130/G23690A.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 SocietyGeology Search Advanced Search Abstract The displacement rate history of the Loreto fault, Gulf of California, is well documented; it is characterized by episodically accelerating displacement (10 k.y. frequency) superimposed upon a period of 200 k.y. of increasing fault displacement rate. A detailed conglomerate provenance analysis in the Loreto basin records the footwall unroofing history, which has been profoundly affected by increased fault displacement rate. Clast count data capture an immediate drainage response to a significant increase in slip rate, along with the occurrence and systematic increase in abundance of a new source rock type. Our data record an increase in the rate of incision and catchment expansion associated with this increase in displacement rate. A provenance signal from a shorter-term (100 k.y.) displacement rate increase has a 30–40 k.y. lag time. No change in provenance is recorded for high-frequency (10 k.y.) variations, which are filtered out by the system. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.