PhD. : 2022. Cochin University of Science and Technology.

Thesis : "Petrochronological constraints on the tectonothermal evolution of Kambam ultrahigh-temperature belt and its implications for the Precambrian crustal evolution of south India".

M.Sc : 2016. Geology, University of Kerala.

B.Sc : 2014. Geology, University of Kerala.

• 2024 - Present Scientist B, SERG, National Centre for Earth Science Studies.
• 2022 - 2024 Project Scientist-I, SERG, National Centre for Earth Science Studies.
• 2017 - 2022 DST INSPIRE Fellow, SERG, National Centre for Earth Science Studies.

My research focuses on developing and applying advanced in-situ petrochronological techniques to investigate fundamental solid Earth processes. This involves the integration of accessory mineral geochronology, trace element geochemistry, phase equilibria modeling, and both traditional and non-traditional isotope systems. My primary research interests and technical expertise include:

• In-situ geochronology of accessory minerals to constrain the timing of magmatic and metamorphic events, elucidate source characteristics, and trace the growth, evolution, and differentiation of the continental crust.
• Pressure-temperature-time-deformation evolution of high to ultrahigh-temperature/pressure metamorphic complexes, through the integration of phase equilibrium modeling and texturally controlled in-situ geochronology.
• Detrital geochronology for understanding crustal evolution, basin development, and sedimentary provenance.
• Carbonate geochronology to constrain the timing of faulting, mineralization, fossilization, fluid flow, and deformation.
• In-situ analyses of non-traditional isotopes in accessory minerals to investigate early continental crust formation, fluid-rock interaction, metasomatism, and elemental cycling.
• Analytical specialization in high-vacuum mass spectrometry (single- and multi-collector) coupled with laser ablation systems for high-resolution isotopic and geochemical analysis, including the development of analytical protocols and matrix-matched reference materials.

1. DST-INSPIRE Research Fellowship, 2018.
2. KSCSTE Junior Research Fellowship, 2017.
3. First Rank for M.Sc. Geology, University of Kerala, 2016.
4. First Rank for B.Sc. Geology, University of Kerala, 2014.
5. GATE (Graduate Aptitude Test in Engineering) qualified, 2017.

• Dev, J.A., and Tomson. Tectonic Evolution of the Southern Granulite Terrane, India: Insights from zircon U-Pb and Hf isotopes. Goldschmidt, July 2025.
• Sahu, M., Banerjee, A., Prabhakar, N., Dev, J.A., Ghosh, S., Sheth, H., and Tomson, J.K. Polyphase deformation history of the Gyangarh-Anjana batholith in the Sandmata Complex (Aravalli Craton, NW India): Structures, zircon- monazite ages, and tectonic significance. Workshop organized by International Association for Structural Geology & Tectonics (IASGT) at IIT Kharagpur, February 2024.
• Deepchand, V., Rajesh, V. J., Dev, J. A., Sorcar, N., Tomson, J. K., & Kumar, R. B. Origin and Tectonothermal Evolution of Lodestones in the Layered Ultramafic Intrusions of Coorg Block: Insights from Textural, Chemical, and Geothermometric Constraints: International Association for Gondwana Research (IAGR) Convention and 20th International Conference on Gondwana to Asia, 2023.
• Dev, J.A., and Tomson. LA-ICPMS zircon-monazite- titanite-rutile-apatite chronology: A robust tool to understand t-T evolution of long-lived orogens: North American Workshop on Laser ablation, June 2023.
• Dev, J.A., and Tomson, J.K. U-Pb baddeleyite and zircon ages from Kambam Carbonatite, south India, and implications on regional tectonics: Goldschmidt, July 2022.
• Tomson, J.K., and Dev, J.A. Crustal evolution of south Indian granulites: Insights from zircon Hf isotopes: Goldschmidt, July 2022.
• Dev, J.A., Tomson, J.K., and Sorcar, N. Unravelling the cooling history of HT-UHT rocks from South India: New evidences from LA-ICPMS analysis of rutiles: Goldschmidt, July 2021.
• Dev, J.A., Tomson, J.K., S. Sajna, Nilanjana Sorcar and V Nandakumar. Decoding Rodinia events in South India: Evidences from late-Tonian ages within granulites: American Geophysical Union Conference, December 2020.
• Dev, J.A., J.K. Tomson., Francis, K.A., Sorcar, N., and Nandakumar, V. Timing of high-grade metamorphism in Madurai Block, S. India: Insights from new U-Pb zircon & monazite ages: Goldschmidt, June 2020.
• Sajna S., Dev, J.A., Sorcar, N., Tomson, J.K., and Nandakumar V. Age & Petrogenesis of Granulites from Nagercoil Block, South India: Goldschmidt, June 2020.

1. Member, Geochemical Society.
2. Member, American Geophysical Union.
3. Member, International Association for Structural Geology and Tectonics.
4. Member, Geological Society of India.

• 0000-0001-9625-0204

• 540211

• Hands-on training in LA-ICP-MS (Agilent 7800 coupled with Teledyne 213 nm Nd:YAG laser) and MC-ICP-MS (Nu Plasma 3), conducted on-site at the National Centre for Earth Science Studies by Agilent Technologies, Teledyne Technologies, and Nu Instruments.
• Convener for session 03d - "From Magmatism to Extreme Metamorphism: Formation, Evolution and Geochronology of the Continental Lower Crust" at Goldschmidt 2025 in Prague, Czech Republic.
• Joint convener, National Conference on "Magmatism, Metamorphism and Metallogeny: Focus on the Indian cratons and Mobile belts" conducted by National Centre for Earth Science Studies, February 16-18, 2025.
• Session Chair for the theme 4dP2 - "The role of Pan-African and Cadomian orogenies in crustal recycling and metamorphism during Cambrian supercontinent assembly" in Goldschmidt 2022, Hawaii, USA.
• Organising committee member, National Workshop on Geodynamic Evolution of South India-Eastern Ghats-Antarctica: Current perspectives and future prospects, conducted by National Centre for Earth Science Studies, September 11-12, 2023.
• Member, Magmatism, Metamorphism, and Metallogeny (MCube) study group, India.
• 2-day Workshop on Geochronology conducted by Inter University Accelerator Centre, New Delhi, November 16-17, 2017.
• 1-day International Workshop on "How to get published in an international high-impact journal" conducted by Elsevier and co-sponsored by the International Association for Gondwana Research & the University of Kerala, November 17, 2016.
• 5-day National workshop on "REE, Zr & Ti Resources from Beach Placer Deposits of India" organized by Atomic Minerals Directorate for Exploration and Research with Geological Society of India, November 7-11, 2016.
• 2-day National workshop on "Mohr Circle and Modern Method of Fabric Analysis in Deformed Rocks" organized during National Seminar on Developments in Geosciences in the Past Decade-Emerging Trends for the Future & Impact on Society along with Annual General Meeting of the Geological Society of India, supported by IUGS-TecTask, October 21-23, 2016.

1. Dev, J.A and Tomson, J.K. (2025). Metamorphic evolution of south Indian granulites: New insights from in-situ U-Pb dating and Nd-Hf isotope fingerprinting of zircon, titanite, monazite, and apatite. Geochemistry.
2. Bivin, G.G., Ray, J.S., Bivin, G.G., Milan, K.M., Dev, J.A., Tomson, J.K., Haripriya, J., and Alok, K. (2025). Geochronology of the Vindhyan Supergroup: implications for the closure of Proterozoic basins of India. Precambrian Research. https://doi.org/10.1016/j.precamres.2025.107790.
3. Sahu, M., Banerjee, A., Prabhakar, N., Dev, J.A., Ghosh, S., Sheth, H., and Tomson, J.K. (2025). The Gyangarh-Anjana granitoids in the Sandmata Complex (Aravalli Craton, northwestern India): syn-kinematic batholith emplacement during Late Palaeoproterozoic continental convergence. Geological Magazine. https://doi.org/10.1017/S0016756825000068.
4. Talukdar, D., Chalapathi Rao, N.V., Dev, J.A., Tomson, J.K., Alok, K., and Ashutosh, P. (2025). Palaeoproterozoic lamproite pulses from the Eastern Dharwar Craton, southern India: some geodynamic implications. Journal of Geological Society of India.
5. Dev, J.A and Tomson, J.K. (2024). U-Pb geochronology of metamorphic rutiles: Deciphering the cooling history of south Indian granulites. Precambrian Research. https://doi.org/10.1016/j.precamres.2024.107408.
6. Tomson, J.K and Dev, J.A. (2024). Detrital zircon U-Pb ages and Hf isotopes of quartzites from Southern Granulite Terrane: Implications for the Precambrian crustal evolution and paleogeography. Precambrian Research. https://doi.org/10.1016/j.precamres.2024.107348.
7. Deepchand, V., Dev, J. A., Rajesh, V. J., Sorcar, N., Tomson, J. K., & Kumar, R. B. (2024). Origin and thermal evolution of Cr-V-Ti magnetites (lodestones) from Coorg massif, South India. Geochemistry. https://doi.org/10.1016/j.chemer.2024.126142.
8. Mukherjee, S., Ghosh, G., Sorcar, N., Dev, J.A., Tomson, J.K., and Bose, S. (2024). Pre-Himalayan tectono-metamorphic impresses in the Baijnath klippe, Kumaun Himalaya, northwest India: implications on a veiled saga of Paleoproterozoic - Neoproterozoic crustal evolution and thermal history of the northern Indian cratonic margin. Geological Society of America Bulletin. https://doi.org/10.1130/B37719.1.
9. Priti, R., Borgohaina, B., George, M., Dev, J. A., and Tomson, J. K. (2024). Tale of Eastern Himalayan River captures and upper Assam uplift: The paleo Brahmaputra conundrum and migration. Gondwana Research. https://doi.org/10.1016/j.gr.2024.06.004.
10. Parvez, K., Mondal, M.E.A., Dev, J.A., Ahmad, I., Wamiq, M.K., and J. K. Tomson, J.K. (2024). Geochemistry and geochronology of 1.7-1.8 Ga peraluminous A-type granites and granite-gneiss from the Mahakoshal Basin, Central Indian Tectonic Zone (CITZ): Implications for an accretionary orogen for the evolution of CITZ. International Geology Reviews. https://doi.org/10.1080/00206814.2024. 2400694 .
11. Francis, K.A., Tomson, J.K., Dev, J.A., Anjitha, J., Sarathlala, K.P., Ajay, K.K., and Dilipkumar, P.G. (2024). Himalayan type strongly peraluminous leucogranite from the western Madurai block, Southern Granulite Terrane, India: Evidence for Tonian crustal reworking. Journal of Earth System Science. https://doi.org/10.1007/s12040-024-02405-0 .
12. Roy, A., Sharma, R.K., Jash, D., Rao, B.P., Dev, J.A., Tomson, J.K. (2024). Imaging of Moho Topography with Conditional Generative Adversarial Network from Observed Gravity Anomalies. Journal of Asian Earth Sciences. https://doi.org/10.1016/j.jseaes.2024.106093.
13. Rajak, P.K., Prabhakar, N., Banerjee, S., Dev, J. A., Bivin, G.G., Tomson, J.K. (2024): Provenance of Mesozoic sandstones in the Saurashtra Basin using heavy mineral chemistry, geochemistry, and geochronological signatures: implications for paleo-drainage pattern and paleogeographic reconstruction in western India. Marine and Petroleum Geology. https://doi.org/10.1016/j.marpetgeo.2024.106732.
14. Anjaneyulu, D., Rao, Y. B., Kumar, T. V., Rajesham, T., Dev, J. A., Tomson, J. K.& Babu, E. V. S. S. K. (2024). Geochemistry of granitoids along the eastern margin of Eastern Dharwar Craton, southern India and their tectonic setting. Journal of Applied Geochemistry, 26(3), 162-174.
15. Tomson, J.K and Dev, J.A. (2023). Tracing the crustal evolution of Precambrian Southern Granulite Terrane in East Gondwana: New insights from zircon U-Pb/Hf geochronology. Geological Society of America Bulletin. https://doi.org/10.1130/B36777.1.
16. Dev, J.A., Tomson, J.K., Vijayakumar, T., & Sorcar, N. (2023). Age and petrogenesis of mafic granulites from central Madurai block, south India: Implications on regional tectonics. Geological Magazine. https://doi.org/10.1017/S0016756823000079.
17. Sorcar, N., Dev, J.A., Mukherjee, S., Joshi, K.B., and Rao, B.P (2023). Metamorphic evolution of granulites from Grovnes peninsula of Larsemann Hills, East Antarctica: Constraints from phase equilibrium modeling and geochronology. Polar Science. https://doi.org/10.1016/j.polar.2023.100982.
18. Mukherjee, S., Das, P., Ghosh, G., Bose, S., Dev, J.A., Das, K., & Tomson, J.K. (2023). Reply to Comments on "Petrography, geochemistry and detrital zircon geochronology of the Srisailam Quartzite Formation, Cuddapah Basin, India: Implications for depositional age, correlation and provenance" of Mukherjee et al. (2023). Precambrian Research. https://doi.org/10.1016/j.precamres.2023.107237.
19. Mukherjee, S., Das, P., Ghosh, G., Bose, S., Dev, J.A., Das, K., & Tomson, J.K. (2023). Detrital zircon geochronology and geochemistry of the Srisailam Formation, Cuddapah Basin, India: implications on sedimentation, provenance, Haedean crustal components, and stratigraphy. Precambrian Research. https://doi.org/10.1016/j.precamres.2023.106978.
20. Mondal, A.K., Bose, S., Dev, J.A., Tomson, J.K., Sorcar, N and Mukherjee, S. (2023). 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. Precambrian Research. https://doi.org/10.1016/j.precamres.2023.106994.
21. Sajna, S., Tomson, J.K., Dev, J.A., and Sorcar, N. (2023): Timing of garnet growth in granulites from southern India: Insights from zircon-monazite-garnet REE partition modeling. Journal of Geological Society of India. https://doi.org/10.1007/s12594-023-2457-z.
22. Dev, J.A, Sorcar, N, Mukherjee, S., & Tomson, J.K. (2022b). Phase equilibrium modelling and zircon-monazite geochronology of HT-UHT granulites from Kambam ultrahigh-temperature belt, south Indian. International Geology Reviews, 1-19. https://doi.org/10.1080/00206814.2022.2091671.
23. Dev, J.A., Tomson, J.K., Sorcar, N., & Francis, K.A. (2022a). Timing of UHT metamorphism and cooling in south Indian granulites: New P-T-t results from a sapphirine granulite. Precambrian Research, 371, 106582. https://doi.org/10.1016/j.precamres.2022.106582.
24. Sajna, S., Tomson, J.K., Dev, J.A., Sorcar, N and Vijaya Kumar, T. (2022): Petrogenesis and tectonic significance of mafic rocks from Nagercoil block, southern India. Minerals. https://doi.org/10.3390/min12121509.
25. Dev, J.A., Tomson, J.K., Sorcar, N., & Nandakumar, V. (2021). 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. Lithos, 406, 106531. https://doi.org/10.1016/j.lithos.2021.106531.
26. Sorcar, N., Mukherjee, S., Pant, N.C., Dev, J.A., & Nishanth, N. (2021). Chemical dating of monazite: Testing of analytical protocol for U-Th-total Pb using CAMECA SXFive tatics EPMA at the National Centre for Earth Science Studies, Thiruvananthapuram, India. Journal of Earth System Science, 130(4), 1-11. https://doi.org/10.1007/s12040-021-01738-4.