National Centre for Earth Science Studies

In Peer Reviewed Journals:

1. Petrological, geochemical and geochronological evolution of massif type charnockite from the Eastern Ghats Province, India: Implications on the regional tectonics of the Rayner-Eastern Ghats orogeny. AK Mondal, S Bose, JA Dev, JK Tomson, N Sorcar, S Mukherjee (2023) Precambrian Research 387; https://doi.org/10.1016/j.precamres.2023.106994
2. Petrography, geochemistry and detrital zircon geochronology of the Srisailam Quartzite Formation, Cuddapah Basin, India: Implications for depositional age, correlation and provenance. S Mukherjee, P Das, G Ghosh, S Bose, JA Dev, K Das, JK Tomson (2023) Precambrian Research 387; https://doi.org/10.1016/j.precamres.2023.106978
3. Neoproterozoic Mafic Magmatism in Nagercoil Block, Southern India and Its Implications on the Gondwana Collisional Orogeny. S Sajna, JK Tomson, JA Dev, N Sorcar, TV Kumar (2023) Minerals ; https://doi.org/10.3390/min12121509
4. Phase equilibrium modelling and zircon-monazite geochronology of HT-UHT granulites from Kambam ultrahigh-temperature belt, south India. J Amal Dev, N Sorcar, S Mukherjee, JK Tomson (2022) International Geology Review; https://doi.org/10.1080/00206814.2022.2091671
5. Timing of UHT metamorphism and cooling in south Indian granulites: New PTt results from a sapphirine granulite. JA Dev, JK Tomson, N Sorcar, KA Francis (2022) Precambrian Research 371; https://doi.org/10.1016/j.precamres.2022.106582
6. Combined U-Pb/Hf isotopic studies and phase equilibrium modelling of HT-UHT metapelites from Kambam ultrahigh-temperature belt, south India: Constraints on tectonothermal history of the terrane. JA Dev, JK Tomson, N Sorcar, V Nandakumar (2021) Lithos; https://doi.org/10.1016/j.lithos.2021.106531
7. Characterization of multiple episodes of melt generation from lower crust during Archaean using amphibole composition. KB Joshi, N Sorcar, NC Pant, V Nandakumar, T Ahmad, JK Tomson (2021) Episodes Journal of International Geoscience 44 (4), 443-466
8. Mantle deformation beneath the Western Ghats, India: Insights from core-refracted shear wave splitting analysis C Sribin, BP Rao, MR Kumar, JK Tomson (2021) Journal of Asian Earth Sciences; https://doi.org/10.1016/j.jseaes.2021.104848
9. Geochemical and isotopic studies of potassic granite from the western Dharwar Craton, southern India: Implications for crustal reworking in the Neoarchean. S Sebastian, R Bhutani, S Balakrishnan, JK Tomson, AD Shukla (2021) Geological Journal; https://doi.org/10.1002/gj.4085
10. Corrigendum to “Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt, India”[Geosci. Front. 11 (2020), 597-611] N Sorcar, KB Joshi, EP Oliveira, JK Tomson, V Nandakumar, Geoscience Frontiers 12 (2), 693-694
11. Detection of soil pipes through remote sensing and electrical resistivity method: Insight from southern Western Ghats, India. M Joshi, PR Prasobh, S Rajappan, BP Rao, A Gond, A Misra, K Eldhose, V Nandakumar, JK Tomson (2021) Quaternary International; https://doi.org/10.1016/j.quaint.2020.08.021
12. Geochemistry of NW-SE trending Palaeoproterozoic mafic dyke intrusions in the Bundelkhand Craton, India and subcontinental lithospheric mantle processes. T Radhakrishna, JK Tomson, R Chandra, C Ramakrishna (2020) Precambrian Research; https://doi.org/10.1016/j.precamres.2020.105956
13. Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt, India. N Sorcar, KB Joshi, EP Oliveira, JK Tomson, V Nandakumar (2020) Geoscience Frontiers; https://doi.org/10.1016/j.gsf.2019.05.013
14. Zircon U-Pb ages and Hf isotopic systematics of charnockite gneisses from the Ediacaran–Cambrian high-grade metamorphic terranes, southern India:Constraints on crust formation, recycling, and Gondwana correlations.” T. Vijaya Kumar, Y.J. Bhaskar Rao, Diana Plavsa, Alan Collins, J.K. Tomson, B. Vijaya Gopal, EVSSK Babu (2017) GSA Bulletin; May/June 2017; v. 129; no. 5/6; p. 625–648;
15. “Geochemistry and Neodymium model ages of Precambrian charnockites, Southern Granulite Terrain, south India: constraints on terrain assembly.” J.K. Tomson, Y.J. Bhaskar Rao, T. Vijaya Kumar, and A. K. Choudhary (2013), Precambrian Research, 227, pp-295-315.
16. “The LAM-MC-ICPMS National Facility at the National Geophysical Research Institute (NGRI), Council of Scientific and Industrial Research, Hyderabad.” Y.J. Bhaskar Rao, B.Vijaya Gopal, EVSSK Babu, N.P.Sukumaran, T.Vijaya Kumar, J.K.Tomson, KVSS Krishna DST News Letter, August 2009, pp.11-13.
17. J.K. Tomson, Y.J. Bhaskar Rao, T. Vijaya Kumar and J. Mallikharjuna Rao (2006), Charnockite genesis across the Archaean – Proterozoic Terrane boundary in the South Indian Granulite Terrain: constraints from major-trace element geochemistry and Sr-Nd isotopic systematics, Gondwana Research, 10, pp-115-127.
18. Y.J. Bhaskar Rao, T. Vijaya Kumar, K.V.S.S.Krishna, J.K.Tomson (2008),The emerging pattern of crust-formation and recycling history in the Precambrian Dharwar Craton and the Southern Granulite Terrain, southern India: Constraints from recent geochronological and isotopic results. Geol.Soc.India, 74, 147-168.
19. J.K. Tomson, Y.J. Bhaskar Rao, T. Vijaya Kumar, A.K. Choudhary (2009) Widespread intracrustal melting and the generation of charnockites in the Neoproterozoic Maduarai Block, South India., Geochimica et Cosmochimica Acta, 73, A1339.
20. T. Vijayakumar, Y.J.Bhaskar Rao, J.K. Tomson, A.K. Choudhary (2009), Role of deep crustal contamination in the genesis of Perinthatta anorthosite massif, South India. Geochimica et Cosmochimica Acta, 73, A1383.
21. J.K. Tomson, Y.J. Bhaskar Rao, T. Vijaya Kumar, A.K. Choudhary (2008)  Geochemistry and Sr-Nd isotopic systematics of Archaean and Neoproterozoic charnockites from the Southern Granulite Terrain, South India: Magma genesis and tectonics.  Geochimica et Cosmochimica Acta, 72, 2S-A951
22. Vijayakumar, Y.J.Bhaskar Rao, J.K. Tomson, A.K. Choudhary (2008), A Mesoproterozoic Sm-Nd age for the Oddanchatram anorthosite massif, South India: Evidence for ancient crustal contamination and significance to the regional terrane assembly. Geochimica et Cosmochimica Acta, 72, 2S- A984.

List of papers presented in conferences:

1. Crustal evolution of south Indian granulites: Insights from zircon Hf isotopes. JK Tomson, JA Dev (2022) Goldschmidt Conference
2. U-Pb baddeleyite and zircon ages from Kambam Carbonatite, south India and implications on regional tectonics. JA Dev, JK Tomson, (2022) Goldschmidt Conference
3. Unravelling the cooling history of HT-UHT rocks from South India: New evidences from LA-ICPMS analysis of rutiles JA Dev, N Sorcar, JK Tomson (2021) Goldschmidt Conference
4. Decoding Rodinia events in South India: Evidences from late-Tonian ages within granulites JK Tomson, S Sajna, N Sorcar, V Nandakumar (2020) AGU Fall Meeting
5. Mantle deformation beneath the southern part of Western Ghats. C Sribin, P Rao, JK Tomson (2020) AGU Fall Meeting
6. “Zircon U-Pb ages and Hf-isotopic compositions of Late Archean charnockites from the Biligiri Rangan, Nilgiri, Vythiri, and Coorg granulite massifs, the Southern Granulite Terrain, S. India: constraints on terrane assembly and charnockite precursors.”T. Vijaya Kumar, Y.J. Bhaskar Rao, Chris Clark, Richard Taylor, J.K. Tomson, B. Sreenivas, E.V.S.S.K. Babu and B. Vijaya Gopal (2013) in Granulites & Granulites Conference, Hyderabad.
7. “NGRI LAM-MC-ICPMS National Facility: Reproducibility of Sr, Nd and Hf isotopic measurements.” Y.J. Bhaskar Rao, B.Vijaya Gopal, EVSSK Babu, N.P.Sukumaran, T.Vijaya Kumar, KVSS Krishna, J.K.Tomson (2009), In Proceedings of 11th ISMAS-TRICON-2009, Hyderabad, pp.52-57.
8. “Sr, Nd, Hf and Pb isotopic characterization of the USGS BCR-2 Standard: Results from the NGRI MC-ICPMS Facility.” N.P.Sukumaran, T.Vijaya Kumar, J.K.Tomson, KVSS Krishna, B.Vijaya Gopal, Y.J. Bhaskar Rao, EVSSK Babu (2009), In Proceedings of 11th ISMAS-TRICON- 2009, Hyderabad, pp.518-521.
9. “Sm-Nd and Rb-Sr ages and isotopic constraints on Precambrian terrain assembly aroundCauvery shear zone system, Southern Granulite Terrain, South India.” Y.J.Bhaskar Rao, T. Vijayakumar, J.K. Tomson, A.M.Dayal (2004), In Proceedings of the International Workshop on Tectonics and Evolution of the Precambrian Southern Granulite Terrain, India and Gondwanian correlations, Feb.18-25, NGRI, Hyderabad.

Ongoing Projects:

Involved in different research programs of Crustal Processes Group, NCESS.

Co-Project Investigator of Department of Science & Technology (DST, India) sponsored project “Geochemistry, palaeomagnetism and isotopic studies of mafic bodies in the Gwalior, Bijawar and Cuddapah Bains: A synthesis of Paleoproterozoic large igneous province in India” (2013-).

Projects Completed:

Title: “Structure and Evolution of the South Indian Craton & Mobile belts from Deep Seismic profiling & other Geophysical and Geological studies.” (DST Sponsored No: ESS/16/158/2002, dtd. May, 2004) Name of PI: Dr. Y.J. BHASKAR RAO; Name of Co-PIs: Mr. T.VIJAYA KUMAR, Dr. TOMSON J.K.

Title: U-Pb zircon geochronology of the Precambrian Southern Granulite Terrain (SGT), southern India: Reconstruction of terrane assembly and resolution of crust formation and recycling events (CSIR-India sponsored).

Education:

Professional career:

1. Scientist E, NCESS (2021 - Present)
2. Scientist D, NCESS (2017-2021)
3. Scientist C, NCESS (2013-2017)
4. Scientist B, NCESS (2010-2013)
5. CSIR – Research Associate (2008-2010): at LAM-MC-ICPMS Laboratory, National Geophysical Research Institute (NGRI), Hyderabad
6. CSIR-UGC Research fellow (2002-2007): at National Geophysical Research Institute (NGRI), Hyderabad. Ph.D. awarded in Geology in 2008 from Osmania University, Hyderabad

Research Interests:

Crustal evolution and tectonics of Precambrian granulite terrains of India.

Analytical techniques involving LA-ICPMS & MC-ICPMS.

Memberships:

1. Member, Geological Society of India

2. Member, Geochemical Society

3. Member, Indian Society of Remote Sensing

4. Member, American Geophysical Union

5. Member, Geochemical Society

In peer reviewed journals:

1. Geomorphic observations from southwestern terminus of Palghat Gap, south India and their tectonic implications”, Yogendra Singh, Biju John, G P Ganapathy, Abhilash George, S Harisanth, K S Divyalakshmi and Sreekumari Kesavan, Journal of Earth System Sciences, 2016, 125, 821-839.
2. The 13th September 2002 North Andaman (Diglipur) earthquake: An analysis in the context of regional seismicity, C.P.Rajendran, Anil Earnest, Kusala Rajendran, R.Devdas and Sreekumari Kesavan, Current Science, Vol.84, No.7, 10 April 2003
3. Mild tremors near Thalasseri (November, 2003): Evidence for a seismic source in north Kerala. Rajendran, K., Rajendran, C.P. and Kesavan, S. 2004 Jour. Geol. Soc. Ind., 64, 233-235
4. “Reassessing the earthquake hazard in Kerala based on the historical and current seismicity “ C.P. Rajendran, Biju John, K. Sreekumari, and Kusala Rajendra Journal of Geological Socity of India, Vol.73, June 2009, pp-785-802
5. “Microseismic activity near the Idukki Reservoir, south India: A rare example of renewed triggered seismicity” Kusala Rajendran, C.P. Rajendran, N. Thulasiraman and K. Sreekumari submitted to Engineering Geology, Volume 153, 8 February 2013, Pages 45-52
6. “Recent microtremors near the Idukki Reservoir, Kerala, South India”, Dr. Kusala Rajendran, Dr. C.P. Rajendran, Sreekumari Kesavan, and R Naveen Current Science, Vol. 102, No. 10, 25 May 2012

Reports:

1. Upgradation and operation of broadband/seismological observatories in the peninisular shield of India :-
   Report on Peechi seismic staion , Submitted to Department of Science and Technology, Government of India. Principal Investigator Dr. Kusala. Rajendran, Co-investigators Dr, C.P Rajendran, K.R. Unnikrishnanan, Sreekumari Kesavan, Dr. Jose Kallarakkal
2. Technical report on the tremors near Wadakkancherry in Thrissur district from 20-26 December 2006 submitted to Kerala State council for Science and Technology forwarded to Department of revenue, Government of Kerala. Principal Investigator Dr. C.P. Rajendran, Co-investigators Dr, Kusala Rajendran, Sreekumari Kesavan, Anu.R
3. Report on the tremor near Kodakara on 13th January 2011” John Mathai, SreekumariKesavan, Binumon Appukkuttan
4. “Report on the slight earthquake at Kottamala near Idukki-Kottayam border on July 26th 2011”, John Mathai, SreekumariKesavan, Binumon Appukkuttan
5. “Report on the Earthquakes in Upputhara Village, Idukki District on November 18th 2011” John Mathai, SreekumariKesavan, Binumon Appukkuttan

Programs Associated:

1. Monitoring Indian Shield Seismicity with 10 BBS to understand Seismotectonics of the region using Vsat connectivity- funded by MOES, PI
2. Continued operation of the Seismic Station , Peechi ( as co- investigator, PI: – K.R. Unnikrishnan) MOES05
3. Monitoring of soil moisture under bare and cropped conditions of tapioca and pineapple in the Western Ghats areas”, (as co- investigator, PI:  Dr.P.V.S.S.K Vinayak) Plg-11
4. Climatological features of Kerala- a ready reckoner,(as co- investigator, PI:  Dr.P.V.S.S.K Vinayak) Plan -281