Environmental magnetic studies on some Quaternary sediments of varied depositional settings in the Indian sub-continent

摘要: Abstract The efficacy and limitations of routine environmental magnetic approaches to characterize compare the Quaternary sediments varied depositional settings (fluvial, fluvio-lacustrine marine) from Indian sub-continent are discussed. various studied profiles fall under tropical wet dry, subtropical humid, cold arid alpine climatic zones at altitudes varying ∼2000 m below sea level ∼4500 msl. mineral assemblages characterized by susceptibility, high field hysteresis parameters their ratios bivariate plots. Besides applying conventional models, we produced new multi-parametric models for finer discrimination (MMA) amongst these deposits. In similar hinterland setup climate zones, independent MMA characteristics shown Late frontal Himalayan basins: Ganga basin, intermontane Pinjor Dun folded Siwalik sequence. Such variations attributed diverse energy conditions due basin morphology, source sink proximity. Contrasting channel overbank relations discernible during glacial interglacial periods within Basin. notably restricted antiferromagnetic region plots indicating formation stability iron oxides warm humid conditions. post-Siwalik show steep gradients in domain a short distance proximal distal fan regime. Peninsular region, ‘source sink’ relation is marked Deccan Trap province (source) Bengal submarine (sink) least since Last Glacial Maxima (LGM) Middle region. MMAs lacustrine deposits foothills as well Higher Himalaya indicate detrital governed fluvial dynamics This demands more detail catchment studies each explore tele-connections altitudinal regions. Overall, this study indicates strong control on transporting media that turn controlled regional tectonics fluctuations. absence suitable unmixing diamond attempted here helpful describing modes its comparison other basins.