Graduations – Sujoy Mukhopadhyay

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UC Davis

Congratulations Dr. Williams!

Dr. Curtis Williams is set to become the new NSF program director for EAR. He will be leaving for DC in September 2020.

Congratulations Dr. Williams!sujoy2021-08-09T03:53:50-07:00

Congratulations Dr. Middleton!

Jennifer Middleton defended her PhD on Elemental fluxes to the seafloor: Pleistocene climate and submarine hydrothermal activity. She will go to Lamont Doherty on the prestigious Lamont prize postdoctoral fellowship.

Congratulations Dr. Middleton!sujoy2021-08-14T00:44:09-07:00

Congratulations Dr. Tucker!

Jonathan Tucker defended his Ph.D. on "A Portrait of Terrestrial Volatile Evolution from Mantle Noble Gases." He will go to the Department of Terrestrial Magnetism on a prize DCO Postdoctoral Fellowship.

Congratulations Dr. Tucker!sujoy2021-08-14T00:43:14-07:00

Reproducibility of Neon Isotopic Ratios

Reproducibility (standard deviation) of Ne isotopic ratios based on repeat analysis of 1.6 × 10^-14 moles of Ne in Air standards. The neon isotopes were measured simultaneously on 3 multipliers and with doubly charged ⁴⁰Ar⁺⁺ resolved from ²⁰Ne⁺. The analysis lasts 20 minutes.

	1σ = 0.008
²⁰Ne/²²Ne: Reproducibility = 0.8 permil
	1σ = 0.00010
²¹Ne/²²Ne: Reproducibility = 3.6 permil

Reproducibility (standard deviation) of Ne isotopic ratios using similar procedures as the standards above but based on repeat analysis of 1.4 × 10^-15 moles of Ne in Air standards .

	1σ = 0.011
²⁰Ne/²²Ne: Reproducibility = 1.1 permil
	1σ = 0.00023
²¹Ne/²²Ne: Reproducibility = 7.8 permil

Reproducibility of Xenon Isotopic Ratios on the Six Multiplier System

Reproducibility of Xe isotopic ratios based on repeat analyses of only 7.6 x 10^-17 moles of Xe in Air standards. Each analysis, which measured all nine xenon isotopes, had two steps and lasted less than 25 minutes. Significant improvements in the precision of the measurement of rare xenon isotopes are observed compared to analyses made with a single, three, or five multiplier instrument. The average ¹²⁴Xe counts in the Air standards were 2.1 cps.


¹²⁴Xe/¹³⁰Xe: Reproducibility = 1.6 percent	¹²⁶Xe/¹³⁰Xe: Reproducibility = 1.7 percent

¹²⁸Xe/¹³⁰Xe: Reproducibility = 5.9 permil	¹²⁹Xe/¹³⁰Xe: Reproducibility = 3.4 permil

¹³⁶Xe/¹³⁰Xe: Reproducibility = 4 permil	¹²⁹Xe/¹³²Xe: Reproducibility = 1.4 permil

¹³⁶Xe/¹³²Xe: Reproducibility = 2.3 permil

Reproducibility of Xenon Isotopic Ratios on the Five Multiplier System

Reproducibility of Xe isotopic ratios based on repeat analyses of 1.4 x 10^-16 moles of Xe in Air standards. Each analysis, which measured all nine xenon isotopes, had three steps. Excellent reproducibility is observed for the isotopic ratios although the reproducibility of the rare isotopes are comparable to the six multiplier system even with twice as large an Air shot. The average ¹²⁴Xe counts in the Air standards were 4 cps.


¹²⁴Xe/¹³⁰Xe: Reproducibility = 1.8 percent	¹²⁶Xe/¹³⁰Xe: Reproducibility = 1.7 percent

¹²⁸Xe/¹³⁰Xe: Reproducibility = 3.8 permil	¹²⁹Xe/¹³⁰Xe: Reproducibility = 2.4 permil

¹³⁶Xe/¹³⁰Xe: Reproducibility = 2.6 permil	¹²⁹Xe/¹³²Xe: Reproducibility = 1.5 permil

¹³⁶Xe/¹³²Xe: Reproducibility = 1.4 permil

Reproducibility of Krypton Isotopic Ratios on the Five Multiplier System

Reproducibility of Kr isotopic ratios based on repeat analyses of 1.9 x 10^-15 moles of Kr in Air standards over a 3 week period. Isotopic ratios were measured using five multipliers simultaneously.


Reproducibility = 3.4 permil	Reproducibility = 2.3 permil


Reproducibility = 0.9 permil	Reproducibility = 0.7 permil	Reproducibility = 0.5 permil

More data coming soon.

Remotely controlled power supplies for bakeout

Automated bakeout system for the in-vacuo crushers and the UHV line controlled by the cRIO system. The bakeout system consists of Sorenson’s remote controlled power supplies (pictured above) interfaced with several T-type thermocouples.

cRIO system

National Instrument’s cRIO system that interfaces with the valves, pumps, pressure gauges, thermocouples, power supplies and the quadrupole mass spectrometer on the UHV line.

Origin of volatiles and early Earth

Mars interior accreted chondritic volatiles in the presence of the solar nebula. Péron S. and Mukhopadhyay S., in review.

Deep mantle krypton reveals Earth’s early accretion of carbonaceous matter. Péron S., Mukhopadhyay S., Kurz M. D., Graham D.W., in review.

Incompatibility of argon during magma ocean crystallization. Jackson C. R. M., Williams C. D., Du Z., Bennett N. R., Mukhopadhyay S., Fei Y., Earth Planet Sci Lett 553, 116598, 2021.

Capture of nebular gases during Earth’s accretion. Williams C. D. and Mukhopadhyay S., Nature 565, 78-81, 2019.

Atmospheric impact losses. Schlichting H. and Mukhopadhyay. Space Science Reviews 214, doi:10.1007/s11214-018-0417-z, 2018.

Preservation of Earth-forming events in the tungsten isotopic composition of modern flood basalts. Rizo, H., Walker, R. J., Carlson, R. W., Horan, M. F., Mukhopadhyay, S. , Manthos, V., Francis, D. and Jackson, M. G. Science 352, 809-812, doi:10.1126/science.aad8563, 2016.

Evidence for multiple magma ocean outgassing and atmospheric loss episodes from mantle noble gases. Tucker, J. M. and Mukhopadhyay, S. Earth and Planetary Science Letters 393, 254-265, doi:10.1016/j.epsl.2014.02.050, 2014.

How did early Earth become our modern world? Carlson, R.W., Garnero, E., Harrison, T.M., Li, J., Manga, M., McDonough, W.F., Mukhopadhyay, S., Romanowicz, B., Rubie, D., Williams, Q. and Zhong, S. Annual Review of Earth and Planetary Sciences 42, 51-178, doi:10.1146/annurev-earth-060313-055016, 2014.

Heterogeneities from the first 100 million years recorded in deep mantle noble gases from the Northern Lau Back-arc Basin. Pető, M., S. Mukhopadhyay, and K. A. Kelley. Earth and Planetary Science Letters 369-370, 13-23, doi:10.1016/j.epsl.2013.02.012, 2013.

Early differentiation and volatile accretion recorded in deep mantle neon and xenon. Mukhopadhyay, S., Nature, 486, 101-104, doi:10.1038/nature11141, 2012.

Isotopic compositions of cometary matter returned by Stardust. McKeegan K.D, et al. Science 314, 1724-1728, doi:10.1126/science.1135992, 2006.

Interstellar chemistry recorded in organic matter from primitive meteorites. Busemann H., A. F. Young, C. M. O. Alexander, P. Hoppe, S. Mukhopadhyay, and L. R. Nittler, Science 312, 727-730, doi:10.1126/science.1123878, 2006.

Earth's interior evolution

Heavy noble gas signatures of the North Atlantic popping rock 2PD43: Implications for mantle noble gas heterogeneity. Parai R. and Mukhopadhyay S., Geochim Cosmochim Acta 294, 89-105, 2021.

The emerging portrait of an ancient, heterogeneous and continuously evolving mantle plume source. Parai R., Mukhopadhyay S., Tucker J. M., and Peto M.K., Lithos 346-347, doi:doi.org10.1016/lithos.2091.105133, 2019.

Primitive helium in oceanic basalts originate from seismically slow regions at the core-mantle boundary. Williams C. D., Mukhopadhyay S., Rudoplp M. L., and Romanowicz B. Geochemistry, Geophsics, Geosystems, doi:10.1029/2019GC008437, 2019.

A record of Earth’s evolution and mantle dynamics. Mukhopadhyay S. and Parai R., Annual Review of Earth and Planetary Sciences 47, 389-417, 2019.

Reconstructing mantle carbon and noble gas contents from degassed mid-ocean ridge basalts. Tucker J. M., Mukhopadhyay S., and Gonnermann H. Earth and Planetary Science Letters 496, 108-119, 2018.

The evolution of MORB and plume mantle volatile budgets: Constraints from fission Xe isotopes in Southwest Indian Ridge basalts. Parai, R. and Mukhopadhyay, S. Geochemistry, Geophysics, Geosystems 16, 719-735, doi:10.1002/2014GC005566, 2015.

¹⁴⁷Sm-¹⁴³Nd systematics of Earth are inconsistent with a superchondritic Sm/Nd ratio. Huang, S., S. B. Jacobsen, S. Mukhopadhyay, Proceedings of the National Academy of Sciences 110, 4919-4934, doi:10.1073/pnas.1222252110, 2013.

Early differentiation and volatile accretion recorded in deep mantle neon and xenon. Mukhopadhyay, S., Nature, 486, 101-104, doi:10.1038/nature11141, 2012.

Heterogeneous upper mantle Ne, Ar and Xe isotopic compositions and a possible Dupal noble gas signature recorded in basalts from the Southwest Indian Ridge. Parai, R., S. Mukhopadhyay, and J. Standish, Earth and Planetary Science Letters 359-360, 227-239, doi:10.1016/j.epsl.2012.10.017, 2012.

The heavy noble gas composition of the depleted MORB mantle (DMM) and its implications for the preservation of heterogeneities in the mantle. Tucker, J. M., S. Mukhopadhyay, and J.-G. Schilling, Earth and Planetary Science Letters 355-356, 244-254, doi:10.1016/j.epsl.2012.08.025, 2012.

Preserving high concentrations of noble gases in a convecting mantle. Gonnermann, H. M., and S. Mukhopadhyay, Nature 459, 560-563, doi:10.1038/nature08018, 2009.

New constraints on the HIMU mantle source from Helium and Neon Isotopic composition of basalts from the Cook-Austral Islands. Parai, R., S. Mukhopadhyay, and J. C. Lassiter, Earth and Planetary Science Letters 277, 253-261, doi:10.1016/j.epsl.2008.10.014, 2009.

Non-equilibrium degassing and a primordial source for helium in ocean-island volcanism. Gonnermann, H. M., and S. Mukhopadhyay, Nature 449, 1037-1040, doi:10.1038/nature06240, 2007.

Earth's surface interior interactions

Linked convective cycling of water, chlorine and noble gases through Earth’s mantle, Tucker J. M., Mukhopadhyay S., Huh M., Langmuir C. H., Hauri E. H., in review.

Xenon isotopic constraints on the history of volatile recycling into the mantle. Parai R. and Mukhopadhyay S., Nature 560, 223-227, 2018.

Hydrothermal deposition on the Jua de Fuca Ridge over multiple glacial-interglacial cycles. Costa K. M., McManus J. F., Middleton J. L., Lanmuir C. L., Huybers P., Winckler G., and Mukhopadhyay S. Earth and Planetary Science Letters 479, 120-132, 2017.

Hydrothermal iron flux variability following rapid sea level changes.Middleton, J. L., Langmuir, C. H., Mukhopadhyay, S. , McManus, J. F., and Mitrovica, J. X. Geophysical Research Letters 43, doi:10.1002/2016GL068408, 2016.

Covariation of climate and long-term erosion rates across a steep rainfall gradient on the Hawaiian island of Kaua’i. Ferrier, K. L., Perron, J. T., Mukhopadhyay, S., Rosener, M., Stock, J. D., Huppert, K. L. and Slosberg, M. GSA Bulletin 125, 1146-1163, doi:10.1130/B30726.1, 2013.

How large is the subducted water flux? New constraints on mantle regassing rates. Parai, R., and S. Mukhopadhyay, Earth and Planetary Science Letters, 317-318, 396-406, doi:10.1016/j.epsl.2011.11.024, 2012.

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