HR: 16:45h
AN: T34A-02    [Abstracts]
TI: India-Madagascar Conjugate Margins: Spatiospectral Localization of Isostatic Coherence Estimation
AU: * Nair, R R
EM: rajeshnair.iitkgp@gmail.com
AF: Indian Institute of Technology, Kharagpur, India, Kharagpur, WB 721302, India
AB: The two-dimensional (2D) nature of the coherence between Bouguer gravity anomalies and bathymetry on the Western Continental margin of India (WCMI) and Eastern Continental margin of Madagascar (ECMM) and their conjugate nature is examined. We estimated the variation of effective elastic thickness (Te) of the lithosphere for the two margins through cross-spectral analysis of gravity and bathymetry data. The results show that Te values at both margins are comparable, despite WCMI having been traversed along strike by a hotspot trace. We also compared Transitional Coherence wavelength (which is equivalent to lithospheric thickness) which are also comparable, varying from 94 km to 127 km for WCMI and 95 km to 102 km for ECMM. These results indicate that these two margins formed by the symmetrical rifting mechanism and also indicate that despite the presence of a hot spot trace along WCMI, the two margins have comparable isostatic compensation mechanism with low Te values.
DE: 0920 Gravity methods (1219)
DE: 1219 Gravity anomalies and Earth structure (0920, 7205, 7240)
DE: 7218 Lithosphere (1236)
DE: 8160 Rheology: general (1236, 8032)
SC: Tectonophysics [T]
MN: 2009 Joint Assembly