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- Title
Anomalous Magnetic Fabric in Apparently Undeformed Lacustrine Deposits: A Case Study from NW Trans-Himalaya, Ladakh, India.
- Authors
Phartiyal, Binita; Sen, Koushik; Meena, Narendra K.
- Abstract
In the present study, an integrated approach of field observations and magnetic analysis has been used to study the Khalsar palaeolake deposits of the Trans-Himalayan region with the objectives of correlating its magnetic fabric with the mesoscopic features. Any signature of deformation in a lake deposit can be deciphered by visible strain markers like the seismites, micro folds and faults; however, in areas where this visible deformation is absent, it is challenging to carry out strain quantification. Thus a proxy like low-field magnetic susceptibility can be useful for fabric quantification in these sediments. The fluvio-lacustrine deposit at Khalsar is characterized by seismites in its middle part while the upper part is devoid of any such features. The magnetic anisotropy indicates presence of tectonic fabric and E-W trending vertical to subvertical foliation in the entire section with magnetite being the major magnetic mineral contributing to laboratory-induced isothermal remanence in these sediments. This vertical to subvertical magnetic fabric is anomalous with respect to the horizontal bedding planes present within this lake deposit. It is envisaged that the vertical magnetic foliation has developed due to migration and deposition of magnetic minerals along the vertical cracks present within the Khalsar lake deposits. This mechanism is similar to formation of 'pressure solution cleavage' in mudrocks, in which re-orientation and/or authigenic growth of magnetite can take place leading to the development of an anomalous magnetic fabric.
- Subjects
LADAKH (India); INDIA; LAKE hydrology; TEXTILE testing; LAKE sediments; SEDIMENTS; TRANS-Himalayas
- Publication
Earth Science India, 2012, Vol 5, Issue 3, p92
- ISSN
0974-8350
- Publication type
Case Study