What is it about?
First integrated magnetism and grain size study of the fluvio-lacustrine deposits from Dhapasi section situated north of Ring Road and NW of Maharajgunj in Kathmandu valley.
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Why is it important?
The valley-fill deposits of Kathmandu comprise alternating layers of black mud, silt, sand and gravel deposits but the thickness of individual layer varies greatly with distance. Therefore, layer-to-layer tracing these deposits and correlating them is almost impossible. This also explains why the seismic response of valley-fill sediments varies by location and simplistic models are not adequate in physical modelling. This study reports a part of results of grain size and magneti susceptibility measurements attempted in several sections of the valley sediments along the E-W and N- transects.
Perspectives
Magnetic polarity dating of the younger stage deposits (Gokarna, Thimi, Patan) Formation exposed in the northern part of the Kathmandu valley is not straight forward due to several factors: very weak natural remanence; loose nature of the sediments making the application of thermal demagnetization almost impossible; presence of hard magnetic minerals such as hematite and goethite along with very soft coercivity magnetite; occurrence of very few reversals within the expected age bracket (<50 kyr); and discontinuous nature of sedimentation. moreover, lack of horizons with precise absolute dating. This study anc accompanying resource present the remanence, magnetic susceptibility, grain size and pollen-derived information, which we believe will be of value to researchers carrying multidisciplinary studies in the valley sediments.
Dr. Pitambar Gautam
Hokkaido Daigaku
Read the Original
This page is a summary of: Magnetism and granulometry of Pleistocene sediments of Dhapasi section, Kathmandu (Nepal): implications for depositional age and paleoenvironment, Bulletin of the Department of Geology, September 2009, Nepal Journals Online (NepJOL),
DOI: 10.3126/bdg.v12i0.2247.
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