Continental rift-setting and evolution of Neoproterozoic Sindreth Basin in NW-India |
| |
| Authors: | Stefan Schöbel Kamal K Sharma Thorsten Hörbrand Theresa Böhm Ines Donhauser Helga de Wall |
| |
| Institution: | 1.Geozentrum Nordbayern,Universit?t Erlangen-Nürnberg,?Erlangen,Germany;2.Department of Geology,Government Postgraduate College,Sirohi,India;3.Geozentrum Hannover,German Federal Institute for Geosciences and Natural Resources,Hannover,Germany |
| |
| Abstract: | The Neoproterozoic Sindreth Basin, NW India, and its surrounding area represent a half graben structure situated between the undeformed Malani Igneous Suite (MIS) in the west and a corridor of coeval Cryogenian ductile deformation, anatexis and granite intrusion in the east. The main lithologies observed in the basin are conglomerate, fanglomerate, debris flow and lake deposits derived from a nearby continental provenance, intercalated with concurrent mafic and felsic lava flows. Based on geological traverses across the strike of the basin, we propose a three-fold classification comprising Lower Clastic Unit and an Upper Clastic Unit and a Bimodal (basalt–rhyolite) Volcanic Unit separating the two. Tilting due to basin inversion and faulting has been observed; however, the rocks are unmetamorphosed and show undisturbed primary sedimentary features. The stratigraphic record of the basin is characteristic for deposition and magmatism in a fault-related continental setting. Implications of the findings have been discussed in the context of Neoproterozoic crustal dynamics in NW India. This study provides conclusive evidence for a continental setting for Sindreth Basin evolution and contests the recent models of active subduction setting (either back-arc basin or accretionary sediments over a subduction zone). |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
