New Structural Geological Input from the Barmer Basin, Rajasthan (India)

Abstract

This study is focused on field structures especially on different brittle structures such as P- and Y-planes, normal faults and reverse faults in the eastern, western and the northern parts of the Barmer basin, Rajasthan (India). Besides aforesaid structures, basalt dykes are mapped in the northern and in the eastern parts of the basin. Reverse faults are first time documented with top-to-NNW shear in the Malani Igneous Suite (MIS). Shear sense indicator are preserved in sandstones with top-to-NE slip. The eastern part of the Barmer basin was affected by NE–SW extension and N–S compression. The western part of the basin witnessed oblique-slip faulting with NE–SW trend and can be identified in terms of brecciated zones cemented in calcareous material at several locations. The enigmatic N–S compression in the extensional Barmer basin might be the far-field effect of the India-Eurasia collision, and deserves more studies.