Drift velocity partitioning indicates anomalous high velocities for the
Indian plate during ~65 Ma
Abstract
A rapid northward drift of the Indian plate after 130 Ma has also
recorded significant plate rotations due to the torques resulting from
multiple vectorial forces. Magnetic anomaly, seismic tomography and
palaeomagnetic database is used here to constrain drift velocities, tilt
and lithospheric root delamination at different temporal snapshots. It
results into estimates of 263.2 to 255.7 mmyr-1
latitudinal drift, 234 to 227.3 mmyr-1 longitudinal
drift and 352.2 to 342.1 mmyr-1 diagonal drift, for
the period from ~66 to 64 Ma during the Chrons
C30n.y–C29n.y. Alternative models suggest active driving forces arising
from i) slab pull, ii) ridge push from eastern-, western
and southern plate margins, and iii) Reunion plume-push force; in
addition to delamination of the lithospheric root during approximately
65+2 Ma. Delamination amplified the buoyancy of the Indian plate in
contrast to sudden loading from Deccan basaltic pile that resulted into
complex drift dynamics expressed by hyper plate velocities within global
plate circuit.