Quaternary deformation in south-western Luni-Sukri basin, Rajasthan, India

The deformation in the Late Quaternary sediments and development of Holocene tectonic landforms in the river basin are attributed to recent tectonic activities. The Geomorphic indices as tectonic indicators were used in the Luni-Sukri basin of south-western Rajasthan, traversed by faults and lineaments. Tectonically induced geomorphology and abnormal Relative Index of Tectonics (Iat) are present along the Marginal Fault (MF1), Neotectonic Faults (NeoF1 & NeoF2) and Minor Lineament 1 (ML1). The block tectonics in the basin is represented by Graben filled with more than 300m of Quaternary sediments bounded by Marginal Faults and Neotectonic Faults. The seismically deformed soft sediment deformation structures (SSDS) are present along faults separating horst and graben in the basin. From the optical ages of the sediments the seismic event is constrained between 1.44±0.2 ka and 0.12±0.03 ka which are possibly responsible for deformation and dislocation of sediments in the area.