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Cenozoic tectonics of the Nicaraguan depression, Nicaragua, and Median Trough, El Salvador, based on seismic-reflection profiling and remote-sensing data

2009; Geological Society of America; Volume: 121; Issue: 11-12 Linguagem: Inglês

10.1130/b26428.1

1943-2674

Justin Funk, Paul Mann, K. D. McIntosh, Jason Henry Stephens,

Geological and Geochemical Analysis

Research Article| November 01, 2009 Cenozoic tectonics of the Nicaraguan depression, Nicaragua, and Median Trough, El Salvador, based on seismic-reflection profiling and remote-sensing data Justin Funk; Justin Funk 1Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, USA *Current address: Devon Energy Corporation, 1200 Smith St., Houston, Texas 77002, USA. E-mail: justin.funk@dvn.com Search for other works by this author on: GSW Google Scholar Paul Mann; Paul Mann † 1Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, USA †E-mail: paulm@utig.ig.utexas.edu Search for other works by this author on: GSW Google Scholar Kirk McIntosh; Kirk McIntosh § 1Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, USA §E-mail: kirk@utig.ig.utexas.edu Search for other works by this author on: GSW Google Scholar Jason Stephens Jason Stephens # 1Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, USA #E-mail: jhstephens@mail.utexas.edu Search for other works by this author on: GSW Google Scholar Author and Article Information Justin Funk *Current address: Devon Energy Corporation, 1200 Smith St., Houston, Texas 77002, USA. E-mail: justin.funk@dvn.com 1Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, USA Paul Mann † 1Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, USA Kirk McIntosh § 1Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, USA Jason Stephens # 1Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, USA †E-mail: paulm@utig.ig.utexas.edu §E-mail: kirk@utig.ig.utexas.edu #E-mail: jhstephens@mail.utexas.edu Publisher: Geological Society of America Received: 09 Mar 2008 Revision Received: 21 Aug 2008 Accepted: 25 Aug 2008 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2009 Geological Society of America GSA Bulletin (2009) 121 (11-12): 1491–1521. https://doi.org/10.1130/B26428.1 Article history Received: 09 Mar 2008 Revision Received: 21 Aug 2008 Accepted: 25 Aug 2008 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Justin Funk, Paul Mann, Kirk McIntosh, Jason Stephens; Cenozoic tectonics of the Nicaraguan depression, Nicaragua, and Median Trough, El Salvador, based on seismic-reflection profiling and remote-sensing data. GSA Bulletin 2009;; 121 (11-12): 1491–1521. doi: https://doi.org/10.1130/B26428.1 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 Lakes Nicaragua and Managua are the two largest lakes in Central America, and they cover a combined area of ~9000 km2 of the presently active Nicaraguan depression and Central America volcanic front. As part of the Subduction Factory focus area of the U.S. National Science "Margins" program, ~1925 km of shallow geophysical data were acquired over Lakes Nicaragua and Managua in May 2006 to establish their late Quaternary structural and stratigraphic history and to better constrain regional models for active tectonics in western Nicaragua, the Gulf of Fonseca, and the Median Trough in El Salvador. In order to investigate regional, upper-crustal deformation resulting from forearc sliver transport and/or slab rollback of the Cocos plate, these new data were integrated with: relocated earthquake epicenters, earthquake focal mechanisms, high-resolution digital topography from the National Aeronautics and Space Administration (NASA) Shuttle Radar Topography Mission (SRTM), published global positioning system (GPS) vectors, onland geologic maps, previous maps of lake bathymetry and bottom sediment types, a previously unpublished regional aeromagnetic data set, and multichannel seismic-reflection profiles from the Gulf of Fonseca and Pacific Ocean. These new data sets have improved bathymetric, bottom sediment, and recent fault maps for both Nicaraguan lakes and can be used as new constraints on the regional geology and tectonics. Three regional structural cross sections across the Nicaraguan depression indicate that the basin is a highly asymmetrical half-graben bounded to the southwest by northeast-dipping, oblique-slip normal faults. Late Oligocene to Holocene extension resulted in footwall uplift along the elevated and folded area of the Nicaraguan Isthmus, and the area of greatest subsidence occurs on the footwall block underlying Lake Nicaragua in the southeast. A similar but younger pattern of footwall uplift adjacent to the down-thrown footwall block is present to the northeast beneath Lake Managua and the Gulf of Fonseca. We interpret this structural pattern as a time-transgressive rift opening, where the oldest extension (late Oligocene–early Miocene) began in the southeast and migrated to the northwest. GPS data indicate that this earlier phase of intra-arc normal rifting is presently being superimposed by arc-parallel, right-lateral shear related to the northwestward transport of the Central America forearc sliver. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.