Abstract Views :214 |
PDF Views:1
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33, GMS Road, Dehradun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 4 (2010), Pagination: 322-330
Abstract
Anisotropy of Magnetic Susceptibility (AMS) and seismic wave velocity studies of some paramagnetic Himalayan granitoids show good correlation between magnetic fabric anisotropy and P wave velocity (Vp). Vp shows strong positive correlation with magnetic lineation (L) and degree of magnetic anisotropy (P') having correlation coefficient (r) values of 0.93 and 0.89 respectively. Both Vp and Vs show positive correlation with the SiO2 content of Proterozoic and Paleozoic granitoids. Velocity of S wave (Vs) shows negative correlation with mean magnetic susceptibility (Km) having 'r' value of 0.86. The correlation between Vs-Km, Vp-P', Vp-L also shows >95% probability in Spearman's rank correlation. Based on the results from the present sample size it is suggested that, in paramagnetic granites, Vp is proportional to intensity of deformation and preferred orientation of minerals as well as the mineralogy. On the other hand, Vs is more dependent on the mineralogy alone.
Keywords
Paramagnetic Granites, AMS, Primary Wave, Secondary Wave, Deformation, XRF, NW Himalaya.
