My research interests are link through sedimentary and aqueous geochemistry. I am interested in understanding the geochemistry of sedimentary basins and how their geochemistry can be used to reconstruct paleo-environments. I am particularly keen on the reconstruction of ocean conditions across the Permian-Triassic Boundary (PTB) to understand the tempo, mechanisms, and severity of the largest mass extinction in Earth’s history.
Additionally, I am equally intrigued by modern weathering impacts on black shales and how it can lead to change in the geochemical cycles within the local watershed to the global ocean. I approach this research focus by linking my expertise in stable isotope and redox-sensitive trace element geochemistry to understand the deposition and lithification of anoxic muds, and how conditions favorable for their deposition are influenced by climate forcing and local environmental impacts.
Lastly, the successful development of unconventional oil and gas resources and its importance in the US energy portfolio has led me to study the depositional and deformational conditions responsible for shale play areas. I approach this problem by utilizing geochemical techniques in understanding how the paleo-environment and post-deposition process create these resources.
Much of my research is lab-based using a wide-array of lab instrumentation:
Major and minor elements: Energy Dispersive X-ray Fluorescence (ED-XRF)
Trace and rare earth elements: Inductively Coupled Plasma Mass Spectrometer (ICP-MS)
Carbon, nitrogen, and sulfur and stable isotopes: Elemental Analyzer (EA) and Isotope Ratio Mass Spectrometer (IRMS)
Ph.D. Environmental Science, University of Massachusetts Boston, 2014, M.S. Environmental Science, University of Massachusetts Boston, 2011, B.S. Marine and Environmental Science, Hampton University, 2008
Brookfield, M.E., Stebbins, A., Williams, J., Wolbach, W., Hannigan, R., Bhat, G.M. Little change in elemental geochemistry across the marine Permian-Triassic boundary section, Guryul ravine (Kashmir, India). Depositional Record
Williams, J.C., Simone, D. M., Buchanan, B., Boulanger, M.T., Bebber, M.R., Eren, M.I. Demonstration of continuous human selectivity of highest quality stone throughout the North American Holocene. Antiquity, (accepted)
Stebbins, A., Hannigan, R., Williams, J., Brookfield, M.E., Nye, S. 2019. Euxinic Intervals during the Upper Permian in the southern Neo-Tethys (Spiti Valley, India). In press. Palaeogeography, Palaeoclimatatoly, Palaeoecology
Stebbins, A., Algeo, T.J., Krystyn, L., Rowe, H., Brookfield, M., Williams, J., Nye, S., Hannigan, R. 2019. The early Triassic marine sulfur cycle provides evidence of upwelling and eutrophic stresses during cooling stages. In press. Earth-Science Reviews
Awatar, R., Tewari, R., Gautam, S., Goswami, S., Brookfield, M., Anihotri, D., Williams, J. 2018. Palynology of the Cyclolobus walker bed, Gungri Formation (Late Permian), Spiti Valley, Northwest Himalaya, India. Journal of the Palaeontological Society of
Sudar, M.N., Kolar-Jurkovšek, T., Nestell, G.P., Jovanović, D., Jurkovšek, B., Williams, J.C, Brookfield, M.E., Stebbins, A.G. 2018. New results of microfaunal and geochemical investigations in the Permian-Triassic boundary interval from the Jadar Block
Brookfield, M.E., Algeo T.J., Hannigan, R., Williams, J.C., and Bhatt G.M. Shaken. 2013. Stirred: Seismites and Tsuamites at the Permian-Triassic Boundary, Guryul Ravine, Kashmir, India. PALAIOS, 2(8): 568-582
Cuoco, E., Tedesco, D., Poreda, R.J., Williams, J. C., et al., 2013. Impact of volcanic plume emissions on rain water chemistry during the January 2010 Nyamuragira eruptive event: implications for essential potable water resources. Journal of Hazardous M
Williams, J.C., Basu, A.R., Bhagarva, O.N., Ahluwalia, A.D., and Hannigan, R.E. 2012. Resolving original signature from a sea of overprint-The geochemistry of the Gungri Shale (Upper Permian, Spiti Valley, India). Chemical Geology, 324: 59-72
Alizai, A., Carter, A., Clift, P. D., VanLaningham, S., Williams, J.C., and Kumar, R. 2011. Sediment provenance, reworking and transport processes in the Indus River by U–Pb dating of detrital zircon grains. Global and Planetary Change, 76(1-2): 33-55
American Geophysical Union, The Geochemical Society, Geological Society of America, Deep Carbon Observatory