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Abstract Submission No. | ABS-2022-13-0426 |
Title of Abstract | Sediment thickness variations and effective elastic thickness beneath the Arabian Basin, north-west Indian Ocean |
Authors | SHRAVAN KUMAR*, Dr. Uma Shankar, Dr. A K Chaubey |
Organisation | BANARAS HINDU UNIVERSITY, VARANASI |
Address | Room No: 76, Dr. CPR Aiyer Hostel, Banaras Hindu University VARANASI, Uttar Pradesh, India Pincode: 221005 Mobile: 8948069634 E-mail: shravan.kumar10@bhu.ac.in |
Country | India |
Presentation | Poster |
Abstract | In the present study, spatial extent of sediment as well as effective elastic thickness below Arabian Basin are estimated. Although it is considered as a normal oceanic crust, evolutionary history of the basin has been very complex. Ship-borne as well as satellite altimetry derived bathymetry and gravity data with available seismic and DSDP data have been used to investigate sediment thickness distributions using gravity data modelling. It shows that northwestern region of the Arabian Basin is carpeted with thick Indus Fan sediments (~3.5 km), whereas northeastern flank of the Carlsberg Ridge is covered with a thin veneer of sediments (~500 m). As it is known that the effective elastic thickness (Te) of the oceanic lithosphere is a proxy for mechanical strength and can be used to constrain lithospheric rheology and its relation to deep Earth processes. Here, we map Te variations over the Arabian Basin from the inversion of the admittance between free-air gravity anomaly and bathymetry data calculated using a continuous wavelet transform, taking both surface and subsurface loads into account. The basin lithosphere shows Te ranging between 0 and 50 km with a mean of 15.8 km and a standard deviation of 15.4 km. Most of the oceanic plateaus and seamounts present in basin show Te nearly 10 km, with the lowest values (<10 km) around the flank of the Carlsberg Ridge. The highest Te estimates (>30 km) are found in areas near Indus Fan and its surroundings. |