Indian continental subduction and slab break-off during Tertiary collision

• DOI: 10.1111/j.1365-3121.2010.00945.x
• Publication Date: 2010-05-12T07:41:29Z
• Authors: Anne Replumaz; Ana M. Negredo; Antonio Villaseñor; Stéphane Guillot
• Keywords: Slab; continental collision; Collision zone; Continental Margin; Eclogitization

Terra Nova, 22, 290–296, 2010 High wavespeed seismic anomalies in the transition zone and uppermost lower mantle beneath India-Asia collision zone, imaged by body-wave tomography, have been interpreted as subducted fragments of continental material. In this study, we focus on prominent anomaly located India between depths about 450 900 km. By combining location with palaeogeographical positions India, constrain timing subduction event probably related to anomaly. We infer that a large portion north-western margin initiated at 35 ± 5 Ma along 1500-km-long WNW–ESE striking ended progressive slab break-off process. This started most around 25 western end propagated eastwards until complete 15 Ma. study helps better amount convergence Asia absorbed subduction.