National Centre for Earth Science Studies

A new research by NCESS unveils coastal evolution & paleoclimatic conditions of the Late Quaternary period through three drilled cores. This study offers invaluable insights into the historical processes that have shaped our coastal landscapes over the years.

Bibliographic Info: Prasenjit Das, D. Padmalal, K.P.N. Kumaran, Ruta B. Limaye, S. Vishnu Mohan, Upasana S. Banerji, Ravi Bhushan. (2024).  
https://doi.org/10.1016/j.qsa.2024.100197.

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Accurate estimation of Moho topography plays a crucial role in understanding Earth’s structure, geodynamic processes, and resource exploration. This study presents a novel approach that utilizes conditional Generative Adversarial Networks (cGAN) to reveal Moho topography based on observed gravity anomalies. Synthetic training datasets of Moho topography were generated using the FFT filtering method due to the scarcity of true datasets. Spherical prism-based forward gravity modeling was employed to evaluate the resulting gravity anomalies.

Bibliographic Info: Arka Roy, Rajat Kumar Sharma, Dharmadas Jash, B. Padma Rao, J. Amal Dev,J.K. Tomson. (2024).  
https://doi.org/10.1016/j.jseaes.2024.106093.

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A new research by National Centre for Earth Science Studies Kerala unveils the cooling history of the Southern Granulite Terrane in south India. New U-Pb rutile ages suggest a 35-million-year cooling period postdating regional metamorphism.

Bibliographic Info: J. Amal Dev, J.K. Tomson. (2024).  
https://doi.org/10.1016/j.precamres.2024.107408.

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Detailed petrology, geochemistry, phase equilibrium modelling and geochronology of metapelites and mafic granulites from Madurai and Nagercoil blocks of South India were carried out to understand their petrogenesis and tectonic setting. The results demonstrate that mafic granulites from Nagercoil block had formed by the partial melting of a subduction- modified enriched mantle source that got emplaced during the late Neoproterozoic with magma generation from a reworked melting sources involving Proterozoic components. Metapelites from Madurai block record high to ultrahigh-temperature metamorphic conditions along a clockwise Paleoproterozoic record and a late Neoproterozoic high-grade metamorphic record. The results from these litho-units are interpreted as the signatures of collisional orogeny prevalent in the region during the final stages of the Gondwana assembly.

Bibliographic Info: Amal Dev, J., Tomson, J. K., Vijaya Kumar, T., Nilanjana Sorcar (2023). Age and petrogenesis of mafic granulites from central Madurai block, south India: implications on regional tectonics. Geological Magazine, Vol. 160 (5), pp. 955-971. https://doi.org/10.1017/S0016756823000079.

Amal Dev, J., Nilanjana Sorcar., Sneha Mukherjee., Tomson, J. K. (2022). Phase equilibrium modelling and zircon-monazite geochronology of HT-UHT granulites from Kambam ultrahigh-temperature belt, south India. International Geology Review, 1-19
https://doi.org/10.1080/00206814.2022.2091671.

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Combined geochronology, geochemical signatures, and Nd isotopic compositions allow us to draw the following conclusions on the evolution of the Archaean granitoids of the Bundelkhand craton: (1) The TTGs of the craton had formed as a result of partial melting of juvenile mafic crust at different depths with contributions from newly formed felsic crust in the Paleoarchaean and older felsic crust in the Neoarchean; (2) The 2.5 Ga high-K granitoids of the craton had formed at convergent subduction settings by partial melting of the mantle wedge and pre-existing crust. Sanukitoids and hybrid granitoids originated in the mantle, the latter showing stronger crustal contributions, whereas abundant anatectic granitoids were the results of the melting of the continental crust.

Bibliographic Info: Kumar Batuk Joshi, Singh, S. K., Halla, J., Ahmad, T., Rai, V. K. (2022). Neodymium isotope constraints on the origin of TTGs and high-K granitoids in the Bundelkhand Craton, Central India Implications for Archaean crustal evolution. Lithosphere, Vol. 2022 (Special 8), Art. 6956845. https://doi.org/10.2113/2022/6956845.

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