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Research works

I am jotting down my research works done in reverse chronological order. The top most one is the recent most research work that I have published/ going to publish.

Reconstruction and evolution of cratons

To understand the evolution of cratons we develop time dependent mantle convection models in CitcomS. Very few studies have attempted such time-dependent approach in a 3-D spherical models to quantify stability of cratons. Yoshida (2010, 2012) had approached such time-dependent forward mantle convection models in restricted spherical domain. Also the location of their continental lithosphere was hypothetical. Our study ( Paul et al. 2020 ) is the first study to model the evolution of cratons for last 410 Ma using realistic location of cratons and reconstructed veolocity boundary condition.
We use a reconstruction model given by Methews et al. 2016 and reconstructed back the location of cratons till 409 Ma. Using the reconstructed locations we develop mantle convection models using reconstructed plate veolocities as prescribed boundary condition.

In our study we use cratons and asthenosphere of different viscosity and investigate which viscosity combination can help in stability of cratons.

Figure from Paul and Ghosh 2020, EPSL
Related Publications
4. J. Paul, A. Ghosh, 2020. Evolution of cratons through the ages: A time-dependent study, Earth and Planetary Science Letters [Online Version]
Related conference presenations
12. J. Paul, A. Ghosh, 2020. On survival of cratonic lithosphere. 36th International Geological Congress, Delhi.
11. J. Paul, A. Ghosh, 2019. Evolution of cratons in time-dependent mantle convection models. AGU Fall Meeting, San Francisco [Online version]
9. J. Paul, A. Ghosh, 2019. Time dependent 3-D numerical modeling of the cratonic evolution. Ada Lovelace Workshop, Siena, Italy. [Online version] [Poster]
8. J. Paul, A. Ghosh , 2019, Evolution and survival potential of cratons: A numerical study. IUGG General Assembly, Montreal. [Online version]
7. J. Paul , A. Ghosh, 2018, Stability of cratons since early Phanerozoic. AGU Fall Meeting, Washington DC. [Online version] [Poster]

Global stress and strain-rates at the base of lithosphere

This study has developed numerical model of the intensity of present-day deformation at the base of the lithosphere using a 3-D spherical mantle convection code CitcomS. Here lithosphere thickness is obtained from the model of Conrad and Lithgow-Bertelloni (2006) and tractions have been calculated at the variable base of the lithosphere. Traction is the resistive force generated as a response to convective stresses exerted by the mantle.

Our model incorporates lateral viscosity variation to specify high viscosity thick cratons and weak plate boundaries. We predict because of high thickness and viscosity deformation under cratons is very low. Such low intensity of deformation helps cratons to survive for billions of years.

Figures from Paul et al. 2019, GJI
Related Publications
2. J. Paul, A. Ghosh, C.P. Conrad, 2019. Traction and strain-rate at the base of the lithosphere: An insight into cratonic survival. Geophysical Journal International. [Online version] [Erratum]
Related conference presenations
8. J. Paul, A. Ghosh , 2019, Evolution and survival potential of cratons: A numerical study. IUGG General Assembly, Montreal. [Online version]
6. A. Ghosh, J. Paul , C.P. Conrad, 2018, The Relation Between Tractions and Strain Rate at the Base of the Lithosphere: Key to Understanding Cratonic Stability. AGU Fall Meeting, Washington DC. [Online version] [Poster]
5. J. Paul , A. Ghosh, 2018, Variation of traction and strain rate with lithospheric thickness: An insight into understanding cratonic stability. EGU General Assembly, Vienna. [Online Version] [Poster]

Layered structure of hydrothermal ore complex and Geostatistics

This work is part of a project investigating the style of hydrothermal mineralisation and ore formation in and around Delhi-Aravalli fold belt. I have worked on the geochemical and geostatistical nalysis of amphibole originated from the hydrothermal processes. We detected three generations of amphiboles. The last stage of amphibole formation (A3) is probably associated with IOCG type mineralisation of this area.

Related Publications
1. A.S. Baidya, J. Paul, D.C. Pal, and D. Upadhyay, 2017. Mode of occurrence and geochemistry of amphibole in the Kolihan-Chandmari copper deposits, Rajasthan, India: Insight into the ore-forming process. Ore Geology Reviews.
Related conference presenations
4. J. Paul, A.S. Baidya, and D.C. Pal, 2015, Origin of alternate amphibole and quartz rich bands in amphibole bearing quartzite from North Khetri Copper Belt, Rajasthan, India, AGU Fall Meeting, San Francisco, V23B-3161
3. A.S. Baidya , J. Paul, and Pal D. C., 2014, Multiple stages of amphibole formation in the Chandmari Cu-deposit, Khetri copper belt, Rajasthan: implications for changing fluid composition vis-à-vis sulfide mineralization, National Conference on Making of the Indian Continent, Presidency University, Kolkata. [RG pdf]bility. EGU General Assembly, Vienna.

Abiological factors in crab ecology

will update soon