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Seismic boundaries of the eastern Central Atlantic Mesozoic crust from multichannel seismic data

1992; Geological Society of America; Volume: 104; Issue: 10 Linguagem: Inglês

10.1130/0016-7606(1992)104 2.3.co;2

1943-2674

E. Banda, César R. Ranero, J. J. Da�obeitia, A. Rivero,

Geological and Geophysical Studies

Research Article| October 01, 1992 Seismic boundaries of the eastern Central Atlantic Mesozoic crust from multichannel seismic data E. BANDA; E. BANDA 1Institute of Earth Sciences "Jaume Almera," CSIC Martí i Franqués s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar C. R. RANERO; C. R. RANERO 1Institute of Earth Sciences "Jaume Almera," CSIC Martí i Franqués s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar J. J. DAÑOBEITIA; J. J. DAÑOBEITIA 1Institute of Earth Sciences "Jaume Almera," CSIC Martí i Franqués s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar A. RIVERO A. RIVERO 2Instituto Geográfico Nacional, General Ibañez de Ibero 3, 28003 Madrid, Spain Search for other works by this author on: GSW Google Scholar Author and Article Information E. BANDA 1Institute of Earth Sciences "Jaume Almera," CSIC Martí i Franqués s/n, 08028 Barcelona, Spain C. R. RANERO 1Institute of Earth Sciences "Jaume Almera," CSIC Martí i Franqués s/n, 08028 Barcelona, Spain J. J. DAÑOBEITIA 1Institute of Earth Sciences "Jaume Almera," CSIC Martí i Franqués s/n, 08028 Barcelona, Spain A. RIVERO 2Instituto Geográfico Nacional, General Ibañez de Ibero 3, 28003 Madrid, Spain Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1992) 104 (10): 1340–1349. https://doi.org/10.1130/0016-7606(1992)104 2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation E. BANDA, C. R. RANERO, J. J. DAÑOBEITIA, A. RIVERO; Seismic boundaries of the eastern Central Atlantic Mesozoic crust from multichannel seismic data. GSA Bulletin 1992;; 104 (10): 1340–1349. doi: https://doi.org/10.1130/0016-7606(1992)104 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 SocietyGSA Bulletin Search Advanced Search Abstract We report the results of a multichannel seismic study on eastern Central Atlantic oceanic crust. Unmigrated and migrated sections have been used to identify the main seismic boundaries within the crust. The upper crust generally is seismically transparent except for a 20-km-long continuous reflection, which we interpret as associated with a long-lived normal fault in the basement and with hydrothermal circulation. Short and discontinuous reflections in the upper crust have also been observed. The lower crust is either transparent or variably reflective in form of subhorizontal layered reflection packages and/or dipping reflections. The reflectivity patterns are interpreted as magmatic in origin except for the dipping reflections that affect the whole crust, which are interpreted as expressions of extensional faults. The reflections dipping ridgeward are thought to have acted as detachment surfaces where plate separation took place. The Moho has been identified along most of the length of the seismic profiles either as the base of the reflective lower crust or as a sharp single reflection. The igneous crust shows large variations in thickness sometimes associated with fracture zones in the Cretaceous crust. Fracture zones in the Jurassic crust do not show, in general, a crustal thinning. This may be due to different accretionary processes during Jurassic and Cretaceous times. 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.