Lynn Walter

Research Areas

• Geochemistry of surface waters and groundwaters
• Carbonate mineral weathering  fluxes from glacial drift soils
• Carbon fluxes from river- groundwater interactions in Michigan watersheds
• Interactions between surface waters and deep saline formation waters
• Role of glaciation in groundwater recharge to MidContinent Basins
• Origin of natural gas in Devonian Shales, Michigan and Illinois Basin

Selected Publications

2004   McIntosh, J.C., Walter, L.M., and Martini, A.M. Geochemical modification of Late-Devonian shale formation waters via microbial methanogenesis. GSA Bulletin 116,  220-237.

2004 Szramek. K., Walter, L.M., and McCall, P. Arsenic mobility in groundwater/surface water systems in carbonate-rich Pleistocene glacial drift aquifers (Michigan). Applied Geochemistry, v. 19, 1137-1155.

2004    Szramek, K and Walter, L.M., Impact of carbonate precipitation on riverine
inorganic  carbon mass transport from a mid-continent, forested watershed. Aquatic  Geochemistry , v. 10, p 99-137.

2006   McIntosh, J.C., and Walter, L.M.   Paleowaters in Silurian-Devonian carbonate aquifers: geochemical evolution of groundwater in the Great Lakes region since the Late Pleistocene. Geochimica et Cosmochimica Acta, vol 70, p. 2454-2479.

2007 Walter, L.M,, Ku, T.C., Muehlenbachs, K, Patterson, W.P., , and L Bonnell
Controls on the 13C of Dissolved Inorganic Carbon in Marine Pore Waters:  An Instructive Example from Biogenic Carbonate Sediments (South Florida Platform).   Deep Sea Research II vol 54, p. 1163-1200.

2007    Williams. E, Szramek, K., Jin, L., Ku, T.C.W., and Walter, L.M. The carbonate
system geochemistry of shallow groundwaters/surface water systems in        temperate glaciated watersheds (Michigan, USA):  Significance of open system dolomite weathering. Geological Society of America Bulletin, vol 119, p. 515-528

2007 Szramek K., McIntosh J.C., Williams E.L., Kanduc T., Ogrinc N. and Walter L.M. Relative weathering intensities of calcite vs. dolomite in carbonate-bearing temperate zone watersheds: Carbonate geochemistry and fluxes from catchments within the St. Lawrence and Danube River Basin. G3, vol. 8, Q04002.  Doi:10.1029/2006GC001137.

2008 Martini, A.M., Walter, L.M., and McIntosh, J.C. Identification of microbial and thermogenic gas components from Upper Devonian black shale cores, Illinois and Michigan basins. AAPG Bulletin. vol. 92; p. 309-326.

2008   Jin, L., Hamilton, S.K. and Walter, L.M.  Mineral weathering rates in glacial   drift soils (SW Michigan, USA): New constraints from seasonal sampling  
  of waters and gases  at soil monoliths. Chemical Geology, vol. 249, p. 129-154.

2008   Jin, L., Williams, E., Szramek, K., Walter, L. M. and Hamilton, S. K.  Silicate and
  carbonate mineral weathering in soil profiles developed on Pleistocene
  glacial drift (Michigan, USA): Mass balances based on soil water
  geochemistry.   Geochimica et Cosmochimica Acta, vol. 72, p. 1027-1042.