Marjorie S Schulz
Marjorie Schulz (Jorie) is a scientist emeritus with the Geology, Minerals, Energy, and Geophysics Science Center. Since joining the USGS in 1987, Jorie has worked in several USGS programs; Marine Geology, the National Research Program of Water Resources, and now GMEGSC.
Jorie does multidisciplinary work built on a foundation in geology. She now describes herself as a biogeochemist with a bit of soil science. Her work has included research on manganese deposits on the ocean floor, mineral weathering, soil development, and geochemistry. Jorie is currently studying the interaction of organic matter (carbon) with soil minerals to understand the processes that stabilize soil carbon.
Professional Experience
2018 - present, Research Physical Scientist, GMEG, USGS Menlo Park, CA
1991 - 2018, Research Hydrologist, WMA NRP, USGS, Menlo Park, CA
1987 - 1991, Geologist, GD Marine Geology, USGS Menlo Park, CA
Education and Certifications
M.S., Earth Science (Sedimentology), University of Missouri-Columbia, 1990
B.A., Geology, Knox College, Galesburg, Illinois, 1979
Affiliations and Memberships*
American Geophysical Union
Geological Society of America
Association for Women Geoscientists
Soil Science Society of America
Science and Products
Filter Total Items: 46
Solute profiles in soils, weathering gradients and exchange equilibrium/disequilibrium Solute profiles in soils, weathering gradients and exchange equilibrium/disequilibrium
The spatial and temporal changes in hydrology and pore water elemental and 87/86Sr compositions were used to determine contemporary weathering rates in a 65 to 226 ky old soil chronosequence formed from granitic sediments deposited on marine terraces along coastal California. Cl-corrected Na, K and Si increased with depth denoting inputs from the weathering of plagioclase and K-feldspar...
Authors
A. F. White, M. S. Schulz, David A. Stonestrom, D.V. Vivit, J. Fitzpatrick, T. Bullen
Chemical weathering of a marine terrace chronosequence, Santa Cruz, California I: Interpreting rates and controls based on soil concentration-depth profiles Chemical weathering of a marine terrace chronosequence, Santa Cruz, California I: Interpreting rates and controls based on soil concentration-depth profiles
The spatial and temporal changes in element and mineral concentrations in regolith profiles in a chronosequence developed on marine terraces along coastal California are interpreted in terms of chemical weathering rates and processes. In regoliths up to 15 m deep and 226 kyrs old, quartz-normalized mass transfer coefficients indicate non-stoichiometric preferential release of Sr > Ca >...
Authors
A. F. White, M. S. Schulz, D.V. Vivit, A.E. Blum, David A. Stonestrom, S.P. Anderson
Chemical weathering of a marine terrace chronosequence, Santa Cruz, California: Deciphering reaction rates from mineral depth profiles Chemical weathering of a marine terrace chronosequence, Santa Cruz, California: Deciphering reaction rates from mineral depth profiles
A soil chronosequence developed on marine terraces along coastal California, exhibits deeper and more intensively weathered mineral profiles with increasing age (65 to 226 kyrs). Feldspar concentrations generally increase linearly with terrace depth. The slope or weathering gradient is defined by the ratio of the weathering rate and the velocity at which the profile penetrates into the...
Authors
Arthur F. White, Marjorie S. Schulz, Davison V. Vivit, David A. Stonestrom, Alex E. Blum
Controls on soil pore water solutes: An approach for distinguishing between biogenic and lithogenic processes Controls on soil pore water solutes: An approach for distinguishing between biogenic and lithogenic processes
Spatial and temporal variations in pore water compositions are characterized for a deep regolith profile developed on a marine terrace chronosequence near Santa Cruz California. Variations are resolved in terms of the dominance of either a lithogenic process, i.e. chemical weathering, or a biogenic process, i.e. plant nutrient cycling. The concept of elemental fractionation is introduced
Authors
A. F. White, M. S. Schulz, D.V. Vivit, A.E. Blum, David A. Stonestrom
Percolation and transport in a sandy soil under a natural hydraulic gradient Percolation and transport in a sandy soil under a natural hydraulic gradient
Unsaturated flow and transport under a natural hydraulic gradient in a Mediterranean climate were investigated with a field tracer experiment combined with laboratory analyses and numerical modeling. Bromide was applied to the surface of a sandy soil during the dry season. During the subsequent rainy season, repeated sediment sampling tracked the movement of bromide through the profile...
Authors
Christopher T. Green, David A. Stonestrom, Barbara A. Bekins, Katherine C. Akstin, Marjorie S. Schulz
The ubiquitous nature of accessory calcite in granitoid rocks: Implications for weathering, solute evolution, and petrogenesis The ubiquitous nature of accessory calcite in granitoid rocks: Implications for weathering, solute evolution, and petrogenesis
Calcite is frequently cited as a source of excess Ca, Sr and alkalinity in solutes discharging from silicate terrains yet, no previous effort has been made to assess systematically the overall abundance, composition and petrogenesis of accessory calcite in granitoid rocks. This study addresses this issue by analyzing a worldwide distribution of more than 100 granitoid rocks. Calcite is...
Authors
A. F. White, M. S. Schulz, J. B. Lowenstern, D.V. Vivit, T.D. Bullen
Science and Products
Filter Total Items: 46
Solute profiles in soils, weathering gradients and exchange equilibrium/disequilibrium Solute profiles in soils, weathering gradients and exchange equilibrium/disequilibrium
The spatial and temporal changes in hydrology and pore water elemental and 87/86Sr compositions were used to determine contemporary weathering rates in a 65 to 226 ky old soil chronosequence formed from granitic sediments deposited on marine terraces along coastal California. Cl-corrected Na, K and Si increased with depth denoting inputs from the weathering of plagioclase and K-feldspar...
Authors
A. F. White, M. S. Schulz, David A. Stonestrom, D.V. Vivit, J. Fitzpatrick, T. Bullen
Chemical weathering of a marine terrace chronosequence, Santa Cruz, California I: Interpreting rates and controls based on soil concentration-depth profiles Chemical weathering of a marine terrace chronosequence, Santa Cruz, California I: Interpreting rates and controls based on soil concentration-depth profiles
The spatial and temporal changes in element and mineral concentrations in regolith profiles in a chronosequence developed on marine terraces along coastal California are interpreted in terms of chemical weathering rates and processes. In regoliths up to 15 m deep and 226 kyrs old, quartz-normalized mass transfer coefficients indicate non-stoichiometric preferential release of Sr > Ca >...
Authors
A. F. White, M. S. Schulz, D.V. Vivit, A.E. Blum, David A. Stonestrom, S.P. Anderson
Chemical weathering of a marine terrace chronosequence, Santa Cruz, California: Deciphering reaction rates from mineral depth profiles Chemical weathering of a marine terrace chronosequence, Santa Cruz, California: Deciphering reaction rates from mineral depth profiles
A soil chronosequence developed on marine terraces along coastal California, exhibits deeper and more intensively weathered mineral profiles with increasing age (65 to 226 kyrs). Feldspar concentrations generally increase linearly with terrace depth. The slope or weathering gradient is defined by the ratio of the weathering rate and the velocity at which the profile penetrates into the...
Authors
Arthur F. White, Marjorie S. Schulz, Davison V. Vivit, David A. Stonestrom, Alex E. Blum
Controls on soil pore water solutes: An approach for distinguishing between biogenic and lithogenic processes Controls on soil pore water solutes: An approach for distinguishing between biogenic and lithogenic processes
Spatial and temporal variations in pore water compositions are characterized for a deep regolith profile developed on a marine terrace chronosequence near Santa Cruz California. Variations are resolved in terms of the dominance of either a lithogenic process, i.e. chemical weathering, or a biogenic process, i.e. plant nutrient cycling. The concept of elemental fractionation is introduced
Authors
A. F. White, M. S. Schulz, D.V. Vivit, A.E. Blum, David A. Stonestrom
Percolation and transport in a sandy soil under a natural hydraulic gradient Percolation and transport in a sandy soil under a natural hydraulic gradient
Unsaturated flow and transport under a natural hydraulic gradient in a Mediterranean climate were investigated with a field tracer experiment combined with laboratory analyses and numerical modeling. Bromide was applied to the surface of a sandy soil during the dry season. During the subsequent rainy season, repeated sediment sampling tracked the movement of bromide through the profile...
Authors
Christopher T. Green, David A. Stonestrom, Barbara A. Bekins, Katherine C. Akstin, Marjorie S. Schulz
The ubiquitous nature of accessory calcite in granitoid rocks: Implications for weathering, solute evolution, and petrogenesis The ubiquitous nature of accessory calcite in granitoid rocks: Implications for weathering, solute evolution, and petrogenesis
Calcite is frequently cited as a source of excess Ca, Sr and alkalinity in solutes discharging from silicate terrains yet, no previous effort has been made to assess systematically the overall abundance, composition and petrogenesis of accessory calcite in granitoid rocks. This study addresses this issue by analyzing a worldwide distribution of more than 100 granitoid rocks. Calcite is...
Authors
A. F. White, M. S. Schulz, J. B. Lowenstern, D.V. Vivit, T.D. Bullen
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government