Professor of Earth Sciences
I study geological processes utilizing isotopic effects as tracers. I have worked on problems as diverse as the evolution of early earth and solar forcing of the terrestrial climate. Many studies have led to the development of innovative analytical techniques that have opened up avenues to examine old and new geochemical problems.
At the moment the following projects are being carried out in my lab: 1) flux of Ir and Os during the K-T boundary impact (with Prof. J. Moore, Univ. of New Mexico and Prof. J. Kirk Cochran, Stony Brook University), 2) Test of meteorite impact hypothesis at Younger-Dryas (we are looking at sediments as well as ice cores), 3) Anthropogenic pollution of platinum metals: a) Tagus estuary, Portugal (in collaboration with Dr. Antonio Cobello, Spain); b) during Roman times using NEEM ice-cre (in collaboration with Prof. Sungmin Hong, Korea), 4) Osmium isotope composition of Solar Wind ( with Dr. Amy Jurewicz using material recovered from NASA's Genesis Mission), 6) Transport of platinum metals during weathering in the Atacama desert ( with Ji-Hye, grad student), 7) Provenance of phosphorus in Dry Valleys of Antarctica (with Ruth Heindel, grad student and Prof. Ross Virginia), 8) Source of briny solutions, Blood Falls, Antarctica, 9) Osmium isotope composition of Deep Ocean Waters (with Prof. S.K. Singh, India). Additionally, over the past two years I have spent a substantial time researching the problem of water-rock interaction during hydraulic fracturing ("fracking"). We are looking at black shale diagenesis as well as what to do with the wastewater that results from fracking. I am working on this problem with Prof. Renock, a graduate student (Danielle Niu) and an undergraduate student (Ying-Qi Wong).
- Magma Differentiation and Source Characteristics of Continental Flood Basalts
- Early evolution of the earth: the terrestrial record of 146Sm
- Study on continental weathering using osmium isotopes
- Variations in Solar Magnetic Activity and the Sun-Climate Connection
- Geochemical and isotopic studies of cosmic dust
- Osmium and Iridium Transport through Estuarine Environments
T. Blazina and M. Sharma (2013) The impact of arc terrain weathering on the global cycles of Sr, Os and C as deduced from the North Island of New Zealand. G3 doi: 10.1002/ggge.20222
Y. Wu, M. Sharma, M. LaCompte, M. Dimitrioff (2013) The origin and provenance of magnetic sphereules at the Younger Dryas Boundary. Proceedings of the National Academy of Sciences Early Edition. www.pnas.org/cgi/doi/10.1073/pnas.1304059110
M. Sharma (2011) Applications of Osmium and Iridium as Biogeochemical Tracers in the Environment. Handbook of Environmental Isotope Geochemistry, Advances in Isotope Geochemistry (ed: M. Baskaran), DOI 10.1007/978-3-642-10637-8_11. Springer-Verlag.
R. Andreasen and M. Sharma (2009) Fractionation and mixing in a thermal ionization mass spectrometer source: implications and limitations for high-precision Nd isotope analyses. International Journal of Mass Spectrometry & Ion Processes: doi:10.1016/j.ijms.2009.04.004
C. Chen and M. Sharma (2009) High precision and high sensitivity measurements of osmium in seawater. Analytical Chemistry: doi:10.1021/ac900600e.
C. Chen, P. Sedwick, and M. Sharma (2009) Anthropogenic osmium in rain and snow reveals global-scale atmospheric contamination. Proceedings of the National Academy of Sciences: 106:7724-7728.
R. Andreasen and M. Sharma (2007) Mixing and Homogenization in the Early Solar System: clues from Sr, Ba, Nd, and Sm isotopes in meteorites. The Astrophysical J. 665: 874-883.
M. Sharma, E. R. Rosenburg, and D. A. Butterfield (2007) Search for the proverbial mantle osmium sources to the oceans: Hydrothermal alteration of mid-ocean ridge basalt. Geochim. Cosmochim. Acta, 71: 4655-4667.
C. Oze and M. Sharma (2007) Serpentinization and the Inorganic Synthesis of H2 in Planetary Surfaces. Icarus. 186: 557-561 (doi:10.1016/j.icarus.2006.09.012).
R. Andreasen and M. Sharma (2006) Solar nebula heterogeneity in p-process Sm and Nd isotopes. Science. 314: 806-809 (doi: 10.1126/science.1131708).
M. Sharma (2002) Variations in Solar Magnetic Activity during the last 200,000 years: Is there a Sun-Climate Connection? Earth Planet. Sci. Lett., 199 (3-4): 459-472.
J. Eisele, M. Sharma, J. Blichert-Toft, C. Devey, S. Galer, and A. W. Hofmann (2002) The role of sediment recycling in EM-1 inferred from Os, Pb, Hf, Nd, Sr isotope and trace element systematics of the Pitcairn hotspot. Earth Planet. Sci. Lett., 196 (3-4): 197-212.
M. Sharma, G. J. Wasserburg, A. W. Hofmann, and G. J. Chakrapani (1999) Himalayan uplift and osmium isotopes in oceans and rivers, Geochim. Cosmochim. Acta,. 63, 4005-4012.
M. Sharma (1997) Siberian Traps. In: Large Igneous Provinces: Continental, Oceanic, and Planetary Flood Volcanism. Eds. J. J. Mahoney and M. Coffin, AGU Monograph, Volume 100, p 273-295, American Geophysical Union, Washington D.C.
M. Sharma and G.J. Wasserburg (1996) The neodymium isotopic compositions and rare earth patterns in highly depleted ultramafic rocks. Geochim. Cosmochim. Acta 60, 4537-4550.