Some ‘Apparent' Space-Time Mismatches (Puzzles) over the Indian Subcontinent and ‘Channeling'
Authors
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2-1-19/C St. 11, Surya Nagar Colony, Uppal, Hyderabad – 500 039
U. Raval -
CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007
K. Veeraswamy
DOI:
https://doi.org/10.1007/s12594-019-1116-xAbstract
Since the Mesozoic the Indian lithosphere has been subjected to significantly large number of high intensity geodynamical events. This gave rise to a few ‘apparent' space-time mismatches between the observed effects and their causes (or sources). For example, the Rajahmundry basaltic traps near the eastern margin (Baksi and Brahmam, 1985) and the Salma dyke in the Raniganj basin (Paul, 2005); both have almost the same age as that of the Deccan volcanism which is presumed to have been caused by the outburst of the Reunion mantle plume near the west coast; but both these formations are located nearly 1000-1400 km away from the epicenter of the plume outburst. Another issue arises from the fact that a ~90 my old volcanism which exists all along the eastern margin of the Madagascar (Mahoney et al., 1991) and is attributed to the Marion plume (Storey, 1995a); but around the same time (~88-90 Ma) the causative Marion plume was situated near the southern end of Madagascar that is ~ 1500 km away from its northern end.
These long separations between the cause and effects seem mismatch or puzzle. Present study suggests that a deep seated ‘channeling' of thermomagmatic flux – from a mantle plume head – along facilitating corridors could: (a) resolve the issue of large separation, (b) reconcile differing views about the origin of the Rajahmundry traps, and (c) explain a number of midplate geophysical, tectonic and geological observations. The ‘Channeling process' thus appears an important unifying concept.
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