Research Associate Earth Sciences
I study noble gas compositions in meteorites and Earth rocks to understand evolution of early solar system, Mars and Moon and Earth. Currently, I am working on following projects at SUNGIRL, Syracuse in collaboration with collogues at The New York Center for Astrobiology. This work is funded by NASA Astrobiology Institute.
(a) Recyling of atmospheric noble gases: Present day atmosphere of Earth is a result of geologic processes that occurred on Earth since the beginning. Understanding the recycling of atmospheric gases on Earth provides clues to understand the evolution of Earth as a planet. By using noble gas isotopic composition as a tracer of atmopsheric gases, I investigate minerals from variety of rocks that have crystallized under different geological settings.
(b) Evolution of Lunar Regolith: The surface of Moon is exposed to highly energetic particles and ions that originates from Sun and other galactic sources. The long term effect of such exposure can be understood by studying cosmogenic noble gas isotopes in fine grained lunar regolith grains. I do the combined study of determining crystallization ages as well as cosmic ray exposure duration for these grains provide clues to the evolution of lunar regolith in general.
Das J. P., Baldwin S. L., and J. W. Delano (2016) 40Ar/39Ar and cosmic ray exposure ages of plagioclase-rich lithic fragments from Apollo 17 regolith, 78461 Earth, Planets and Space, 68:11 doi:10.1186/s40623-016-0381-9
Baldwin S. L., and Das J. P. (2015) Atmospheric Ne and Ar returned from mental depths to the Earth's surface by forearc recyling Proceedings of the National Academy of Sciences doi: 10.1073/pnas.1424122112
Das J. P., Goswami J. N., Pravdivtseva O., Meshik A., and Hohenberg C. (2012) Cosmogenic neon in grains separated from individual chondrules: Evidence of precompaction exposure in chondrules. Meteoritics & Planetary Science, 47, 1869-1883.
Das J. P. and Murty S. V. S. (2009) Trapped nitrogen in individual chondrules: Nature of chondrule precursors and clues to formation mechanisms J. Geophys. Res. (Planets) 114, E01008, doi:10.1029/2008JE003232.
Das J. P. and Murty S. V. S. (2009) Cosmogenic and trapped noble gases in individual chondrules: Clues to chondrule formation. Meteoritics & Planetary Science, 44, 1797-1818.