Direct evidence of active deformation in the eastern Indian oceanic plate

Abstract

Research Article| February 01, 1998 Direct evidence of active deformation in the eastern Indian oceanic plate Christine Deplus; Christine Deplus 1CNRS/Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 05, France Search for other works by this author on: GSW Google Scholar Michel Diament; Michel Diament 2Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 05, France Search for other works by this author on: GSW Google Scholar Hélène Hébert; Hélène Hébert 2Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 05, France Search for other works by this author on: GSW Google Scholar Guillaume Bertrand; Guillaume Bertrand 3École Normale Supérieure, 24 rue Lhomond, 75005 Paris, France Search for other works by this author on: GSW Google Scholar Stéphane Dominguez; Stéphane Dominguez 4Laboratoire de Géophysique et Tectonique, Université de Montpellier II, Case 060, 4 place E. Bataillon, 34095 Montpellier Cedex, France Search for other works by this author on: GSW Google Scholar Jacques Dubois; Jacques Dubois 2Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 05, France Search for other works by this author on: GSW Google Scholar Jacques Malod; Jacques Malod 5CNRS/Université de Bretagne Occidentale, 6 av. LeGorgeu, B.P. 452, 29275 Brest Cedex, France Search for other works by this author on: GSW Google Scholar Philippe Patriat; Philippe Patriat 2Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 05, France Search for other works by this author on: GSW Google Scholar Bernard Pontoise; Bernard Pontoise 6ORSTOM, UR14-Laboratoire de Géodynamique sous-marine, B.P. 48, 06230 Villefranche-sur-Mer, France Search for other works by this author on: GSW Google Scholar Jean-Jacques Sibilla Jean-Jacques Sibilla 2Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 05, France Search for other works by this author on: GSW Google Scholar Author and Article Information Christine Deplus 1CNRS/Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 05, France Michel Diament 2Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 05, France Hélène Hébert 2Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 05, France Guillaume Bertrand 3École Normale Supérieure, 24 rue Lhomond, 75005 Paris, France Stéphane Dominguez 4Laboratoire de Géophysique et Tectonique, Université de Montpellier II, Case 060, 4 place E. Bataillon, 34095 Montpellier Cedex, France Jacques Dubois 2Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 05, France Jacques Malod 5CNRS/Université de Bretagne Occidentale, 6 av. LeGorgeu, B.P. 452, 29275 Brest Cedex, France Philippe Patriat 2Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 05, France Bernard Pontoise 6ORSTOM, UR14-Laboratoire de Géodynamique sous-marine, B.P. 48, 06230 Villefranche-sur-Mer, France Jean-Jacques Sibilla 2Institut de Physique du Globe de Paris, Case 89, 4 Place Jussieu, 75252 Paris Cedex 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 (1998) 26 (2): 131–134. https://doi.org/10.1130/0091-7613(1998)026<0131:DEOADI>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 Christine Deplus, Michel Diament, Hélène Hébert, Guillaume Bertrand, Stéphane Dominguez, Jacques Dubois, Jacques Malod, Philippe Patriat, Bernard Pontoise, Jean-Jacques Sibilla; Direct evidence of active deformation in the eastern Indian oceanic plate. Geology 1998;; 26 (2): 131–134. doi: https://doi.org/10.1130/0091-7613(1998)026<0131:DEOADI>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 Conventional plate tectonics theory postulates that plates only deform on their boundaries. To the contrary, there is ample evidence of intraplate deformation in the equatorial Indian Ocean, west of the Ninetyeast aseismic ridge. Prior to this study, no direct evidence of deformation east of the Ninetyeast Ridge was available. We present the results of a multipurpose geophysical cruise showing that intraplate deformation also occurs in this area. Long, at least 1000 km, left-lateral north-south strike-slip faults are active and reactivate fossil fracture zones. This style of deformation is strikingly different from the east-west folds and reverse faults that affect the region west of the Ninetyeast Ridge. Contrasting processes of convergence at the northern plate boundaries can account for the two styles of deformation. West of the Ninetyeast Ridge there is a continent-continent collision, and east of the ridge oceanic lithosphere subducts along the Sumatra trench. The Ninetyeast aseismic ridge therefore appears to be a mechanical border separating two distinct deformed areas. 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.