Palaeoseismicity in relation to basin tectonics as revealed from soft-sediment deformation structures of the Lower Triassic Panchet formation, Raniganj basin (Damodar valley), eastern India

Journal of Earth system science

Abhik Kundu1³  Bapi Goswami2²  Abhijit Chakraborty4⁴  Patrick G Eriksson3¹ 

[1] Department of Geology, University of Pretoria, Pretoria 0002, South Africa.$$;Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700 029, India.$$;Department of Geology, Asutosh College, 92, S.P. Mukherjee Road, Kolkata 700 026, India.$$;Department of Geology, Jogamaya Devi College, 92, S.P. Mukherjee Road, Kolkata 700 026, India.$$

关键词: Soft-sediment deformation structures;    seismites;    Panchet formation;    Lower Triassic.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The Raniganj basin in the Damodar valley of eastern India is located within the riftogenic Gondwana Master-Basin. The fluvio-lacustrine deposits of the Lower Triassic Panchet Formation of the Damodar valley in the study area preserve various soft-sediment deformation structures such as slump folds, convolute laminae, flame structures, dish-and-pillar structures, sandstone dykes, pseudonodules and syn-sedimentary faults. Although such soft-sediment deformation structures maybe formed by various processes, in the present area the association of these structures, their relation to the adjacent sedimentary rocks and the tectonic and depositional setting of the formation suggest that these structures are seismogenic. Movements along the basin margin and the intra-basinal faults and resultant seismicity with moderate magnitude (2–5 on Richter scale) are thought to have been responsible for the soft-sediment deformations.

【 授权许可】

Unknown