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Dr. K.S. Krishna becomes a Fellow of the National Academy of Sciences, India
Dr. Kolluru Sree Krishna, Scientist G, National Institute of Oceanography, Dona Paula, Goa has become a Fellow of the National Academy of Sciences, India. Dr. K.S. Krishna has pioneered in the field of Marine Geophysics, particularly in understanding the Earth’s interior and tectonics of the Indian Ocean.
He has made significant science advancement in three complex geological aspects of the Indian Ocean:
continental rift initiation and evolution between India and Antarctica,
lithospheric deformation in the central Indian Ocean in response to the rapid uplift of Himalayas, and
investigation of fixity of primary hotspots of the global oceans and mantle circulation.
The proposed theories have superseded the earlier concepts and provide most reasoning propositions for the evolution of the oceanic lithosphere beneath margins and basins, and aseismic ridges.
New tectonic constraints determined from conjugate regions of Bay of Bengal and Enderby Basin, East Antarctica revealed that present day eastern margin of India evolved in two rifting phases: initially at 130 millions of years before present (Ma) India drifted from East Antarctica and later at 120 Ma a piece of continent, called Elan Bank and a kin to Eastern Ghats detached from the present-day margin and located close to Antarctica. Investigations of the central Indian Ocean lithosphere led to hypothesize that the lithosphere began to deform and fracture since 15.4 Ma in multiphase; this impacts our understanding of uplift of Himalayas and development of diffuse plate boundary in the Indian Ocean.
Radiometric ages of the Ninetyeast Ridge suggested that the ridge age is decreasing towards south with an excellent linearity at a rate of 118+5 km/Myr. The discrepancies in lengths of the Ninetyeast Ridge track and adjacent oceanic crust evolved within the same time-frame reference (77-43 Ma) is quiet remarkable and indicating that the ridge was formed at a rate of almost a factor-of-two acceleration (118+5 km/Myr) in comparison to the rate of relative plate motion (50 – 58 km/Myr). With the consideration of ages of the Ninetyeast Ridge, spreading records of the contiguous oceanic basins, and global plate motions, an approximate estimate of 42 mm/yr hotspot drift was made. Although the hotspot was moving rapidly towards south, series of southward ridge jumps have allowed the hotspot to be positioned on the Indian plate until 38 Ma. In the Pacific Ocean, an estimation of over 40 mm/yr of southward motion of the Hawaiian hotspot plume was made during the formation of the Emperor Seamounts chain from 81 to 47 Ma. The estimated motions of both the Kerguelen and Hawaiian primary hotspots seems to be rapid and cohesive ranging from 40 to 42 mm/yr towards south, revealing approximately similar behavior of past mantle circulation during those timings.
Before joining the National Institute of Oceanography, Goa in 1984 Dr. Krishna had briefly worked for American oil prospecting company for the exploration of Hydrocarbons in Krishna-Godavari and Cauveri basins. Since then at NIO he took-up various positions and presently rose to Scientist G. For his scientific works Dr. Krishna has been earlier honoured with M.S. Krishnan Medal, S.S. Bhatnagar Prize and Fellowships of the Indian Academy of Sciences and Indian Geophysical Union.
for other details about Dr. Krishna.
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