Crustal density structure across the Central Indian Shear Zone from gravity data

Publication year: 2011
Source: Journal of Asian Earth Sciences, In Press, Accepted Manuscript, Available online 13 June 2011

B., Nageswara Rao , Niraj, Kumar , A.P., Singh , M.R.K., Prabhakar Rao , D.M., Mall , …

The Central Indian Shear Zone is a distinct tectonic feature in the central part of India that separates the Central Indian Tectonic Zone from the Bastar Craton. The complete Bouguer anomaly map of the region encompassing Central Indian Shear Zone is characterized by a broad relative gravity high over Central Indian Tectonic Zone as compared to the Bastar Craton. The paired gravity anomaly across the two crustal domains signifies that the Central Indian Shear Zone is a locus of density discontinuity along which the two crustal domains accreted. Horizontal gravity gradient analysis further demonstrates the northward subduction of the Bastar…

 Highlights: ► Paired gravity anomaly indicates that the CISZ is a locus of density discontinuity. ► HGG indicates northward subduction of Bastar Craton beneath Bundelkhand Craton. ► Gravity modelling delineated Moho offset & density discontinuity across the CISZ. ► CISZ is inferred as a cryptic suture between the Bastar & Bundelkhand cratons.