Intraplate shortening in the central Indian Ocean determined from a 2100-km-long north-south deep seismic reflection profile

Research Article| November 01, 1993 Intraplate shortening in the central Indian Ocean determined from a 2100-km-long north-south deep seismic reflection profile N. Chamot-Rooke; N. Chamot-Rooke 1Laboratoire de Géologie, CNRS URA 1316, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cédex 05, France Search for other works by this author on: GSW Google Scholar F. Jestin; F. Jestin 1Laboratoire de Géologie, CNRS URA 1316, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cédex 05, France Search for other works by this author on: GSW Google Scholar B. de Voogd B. de Voogd 1Laboratoire de Géologie, CNRS URA 1316, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cédex 05, France Search for other works by this author on: GSW Google Scholar Author and Article Information N. Chamot-Rooke 1Laboratoire de Géologie, CNRS URA 1316, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cédex 05, France F. Jestin 1Laboratoire de Géologie, CNRS URA 1316, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cédex 05, France B. de Voogd 1Laboratoire de Géologie, CNRS URA 1316, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cédex 05, France Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1993) 21 (11): 1043–1046. https://doi.org/10.1130/0091-7613(1993)021<1043:ISITCI>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 Email Permissions Search Site Citation N. Chamot-Rooke, F. Jestin, B. de Voogd; Intraplate shortening in the central Indian Ocean determined from a 2100-km-long north-south deep seismic reflection profile. Geology 1993;; 21 (11): 1043–1046. doi: https://doi.org/10.1130/0091-7613(1993)021<1043:ISITCI>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 Although intraplate deformation is commonly observed on the continents, there are only a few places in the oceans where deformation is distributed over a broad area rather than being localized at a single plate boundary. The central Indian Ocean has long been recognized as a site of active widespread compressive deformation of the oceanic lithosphere, reflecting an exceptionally high stress level. However, the strain pattern, derived from indirect and incomplete observations, remains poorly known. A more complete data set was obtained during the Phèdre cruise (1991) by means of deep seismic reflection profiling. One 2100-km-long profile runs along the 81°E meridian from lat 14°S to the coast of Sri Lanka, and provides us with the first long cross section through the region of observed crustal-level faults. Fault analysis offers new estimates of the amount of shortening, which was obtained across individual faults by measuring the maximum vertical uplift of sedimentary reflectors at the base of the sedimentary cover and converting it to horizontal throw under various assumptions of the fault geometry. The contribution of the seismically resolvable faults amounts to 22-37 km of shortening or 2.5%-4.3%. This is two to three times greater than previous estimates extrapolated from local measurements on shorter seismic reflection profiles. 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.