Anomalous granulite crust of South India — signatures from converted teleseismic waves |
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| Authors: | D S Ramesh D Srinagesh S S RAI K S PRAKASAM |
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| Institution: | 1. National Geophysical Research Institute, Uppal Road, 500 007, Hyderabad, India
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| Abstract: | Analysis of teleseismic waves usingS-P converted phases, travel time-terms and residual travel times point to the presence of an anomalous thick (4—5 km thicker)
low velocity (−3%) crust beneath Kodaikanal (KOD) on granulites characterized by an oriented inhomogeneity inferred as possibly
due to Mylonites in contrast to the nature of crust beneath the adjoining precambrian granite-gneiss terrain. The observed
seismic signatures in the South India granulites (represented by KOD) offer an opportunity to discriminate between the competing
hypotheses of tectonic thickening and magmatic underplating to explain the origin of the granulites of South India. This analysis
lends support to the hypothesis of a continent-continent collision origin for the granulites in the study region. |
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| Keywords: | Anisotropy collision tectonics converted phases granulites |
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