1. Skip to navigation
  2. Skip to content
  3. Skip to sidebar

Jayeshkumar Das

Research Associate Earth Sciences

Research Interests

I study noble gas compositions in chondrites as well as other meteorites to understand evolution of early solar system, Mars and Moon. 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) History of volcanism on Mars: Mars Exploration Rover (MRE) Opportunity found plagioclase in sedimentary basin of Meridiani Planum. Plagioclase is also known to exist in igneous Martian meteorites. Study of argon (Ar) in plagioclase can be critical to understand formation of present Martian surface as well as Martian climate as both were highly affected by volcanoes in the past. Argon diffusion experiments are planned to estimate kinetic parameters. Results will provide information about how much volcanic histories can be extracted from plagioclase studies. This feasibility study will ultimately used to develop sampling strategies for future sample return mission from mars.

(b) Origin of chondrules: Chondrules are abundant spherical objects (~1 mm diameter) commonly found in most chondrites (primitive meteorites). Their high population suggest that process of chondrules formation was efficient astrophysical event occurred during early stages of solar system formation. However, very little is known. Study of trapped and cosmogenic noble gases provides clues to understand nature of chondrule precursors as well as chondrule formation process. We plan to study noble gases in different mineral phases of chondrules, which can provide further constraints to the models proposed for chondrule formation. Additionally, such study will improve our understanding of noble gas distribution among different mineral phases crystallized at high temperature and lower pressure.

Images of chondrules and their textures

Images of chondrules and chondrule textures (a) Piece of Dhajala meteorite with chondrules on surface. (b) Slab of a Murchison meteorite, chondrules are visible as circles. (c) A Separated chondrule from Allende meteorite (> 1mm diameter). Back-scattered electron (BSE) images: (d) A porphyritic pyroxene (PP) chondrule from Dhajala meteorite (e) A chondrule from Parsa meteorite with single texture (f) A chondrule with rim from Chainpur meteorite (g) Barred-olivine (BO) chondrule from Murray meteorite (h) Porphyritic olivine (PO) chondrule with rim from Allende meteorite (i) Elliptical micro-crystalline chondrule with faint rim from Bjurböle meteorite.


Publications

Das J. P., Goswami J. N., Pravdivtseva O., Meshik A., and Hohenberg C. (2012) Cosmogenic neon in grains separated from individual chondrules: Evidence of pre-compaction 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.