Geochemistry / Mineralogy is one of more than 16 discipline tags that we use to categorize and aggregate our interdisciplinary information within and across CZOs. Much of our information has been tagged with 2-3 disciplines.
7 People
INVESTIGATOR
GRAD STUDENT
UNDERGRAD
INVESTIGATOR
Cross-CZO INVESTIGATOR, Visiting/Affiliate, COLLABORATOR
GRAD STUDENT
Calhoun 70-m deep well - Soil Mineralogy, Soil Geochemistry, Photographic Imagery (2019)
4 components •
Calhoun CZO Research Area 1 •
Geochemistry / Mineralogy, Soil Science / Pedology •
Austin, Jason C.; Bacon, Allan R.; Richter, Daniel deB.; Schroeder, Paul A.
Calhoun 70m deep well - Soil Geochemistry (2010)
1 components •
Calhoun Long-Term Soil-Ecosystem Plots and Reference Areas •
Soil Science / Pedology, Geochemistry / Mineralogy •
Bacon, Allan R; Richter, Daniel deB.; Bierman, Paul R.; Rood, Dylan H.
Calhoun CZO - Soil Geochemistry (2016)
1 components •
Calhoun CZO Research Area 1, Calhoun CZO Research Area 2, Calhoun CZO Research Area 6, Calhoun CZO Research Area 7, Calhoun CZO Research Area 8 •
Geochemistry / Mineralogy •
Austin, Jason C.; Schroeder, Paul A.
Calhoun Long-Term Soil Experiment - Soil Geochemistry - 70-m deep borehole (2010)
1 components •
Calhoun Long-Term Soil-Ecosystem Plots and Reference Areas •
Biogeochemistry, Geochemistry / Mineralogy, Soil Science / Pedology •
Bacon, A.R.; Richter, Daniel deB.
Shale Hills, Boulder, Luquillo, JRB-SCM, Calhoun - Soil Geochemistry (2001-2013)
1 components •
Susquehanna Shale Hills Critical Zone Observatory, Bisley, Boulder Creek Watershed, Northeastern Puerto Rico and the Luquillo Mountains, Santa Catalina Mountains •
Geochemistry / Mineralogy, Biogeochemistry •
Niu, Xianzeng; Williams, Jennifer; Brantley, Susan L.; Miller, Doug; Bills, Brian
2020
Quantification of Mixed-Layer Clays in Multiple Saturation States Using NEWMOD2: Implications for the Potassium Uplift Hypothesis in the SE United States. Austin, J.C., Richter, D.D. & Schroeder, P.A. (2020): Clays and Clay Minerals
2020
Wetness controls on global chemical weathering. Calabrese, S., and A. Porporato (2020): Environmental Research Communications 2(8), 085005
2020
Hydroclimatic control on global weathering regimes. Calabrese, Salvatore, and Amilcare Porporato (2020): EGU General Assembly 4-8 May 2020
2019
Biological Cycling of Potassium by Roots as a Control on Mixed-layer Clays. Austin, Jason, Paul A Schroeder, Daniel deB. Richter (2019): American Geophysical Union Fall Meeting, San Francisco, CA, December 9-13, 2019
2019
The Dimensionless Groups of Chemical Weathering: Disentangling the Role of Hydroclimatic and Geological Factors. Calabrese, Salvatore, and Amilcare Porporato (2019): American Geophysical Union Fall Meeting, San Francisco, CA, December 9-13, 2019
2019
Redoximorphic Bt horizons of the Calhoun CZO soils exhibit depth-dependent iron-oxide crystallinity. Chen, Chunmei, Diego Barcellos, Daniel D. Richter, Paul A. Schroeder, Aaron Thompson (2019): Journal of Soils and Sediments 19(2):785-797
2019
Natural, incidental, and engineered nanomaterials and their impacts on the Earth system. Hochella, Michael F., Jr., David W. Mogk, James Ranville, Irving C. Allen, George W. Luther, Linsey C. Marr, B. Peter McGrail, Mitsu Murayama, Nikolla P. Qafoku, Kevin M. Rosso, Nita Sahai, Paul A. Schroeder, Peter Vikesland, Paul Westerhoff, Yi Yang (2019): Science 363 (6434): eaau8299
2019
Links between physical and chemical weathering inferred from a 65-m-deep borehole through Earth’s critical zone. Holbrook, W. Steven, Virginia Marcon, Allan R. Bacon, Susan L. Brantley, Bradley J. Carr, Brady A. Flinchum, Daniel D. Richter, & Clifford S. Riebe (2019): Scientific Reports 9: Article number 4495
2019
A coupled microscopy approach to assess the nano-landscape of weathering. Lybrand, Rebecca A., Jason C. Austin, Jennifer Fedenko, Rachel E. Gallery, Erin Rooney, Paul A. Schroeder, Dragos G. Zaharescu, & Odeta Qafoku (2019): Scientific Reports 9: Article number 5377 Cross-CZO
2019
Ice Formation and Microbes: A Microscale Perspective on Interactive Biophysical Weathering Agents in the Critical Zone. Lybrand, Rebecca, George Dragos Zaharescu, Jason Austin, Swarup China, Rachel E. Gallery, Paul A. Schroeder, Daniel Veghte, and Odeta Qafoku (2019): ASA-CSSA-SSSA International Annual Meeting, 10-13 Nov. 2019, San Antonio, Texas Cross-CZO
2019
Identifying the organic and inorganic products of incipient weathering in natural environments. Lybrand, Rebecca, Jason Austin, Rosalie Kae Chu, Odeta Qafoku, Tom Resch, Erin Rooney, Paul A Schroeder, Malak M Tfaily, Jason Toyoda, Vaithiyalingam Shutthanandan, Dragos George Zaharescu, Maya Bergmann, Benjamin Pierce, Rachel E Gallery (2019): American Geophysical Union Fall Meeting, San Francisco, CA, December 9-13, 2019 Cross-CZO
2019
Bioavailability of carbon in ferrihydrite-organic matter coprecipitates transformed by Fe (II)-catalyzed recrystalization. Noor, Nadia, Aaron Thompson, Zhe Zhou, Drew E. Latta, Michelle M. Scherer, Alain F. Plante, and Thomas Borch (2019): Soil Science Society of America International Soils Meeting, San Diego, CA, 6-9 January 2019
2019
Effect of Reaction Time of Fe (II) with Different C/Fe Ratio Containing Ferrihydrite-Natural Organic Matter Coprecipitate on the Bioavailability of Carbon. Noor, Nadia, Zhe Zhou, Drew E. Latta, Michelle M. Scherer, Alain F. Plante, Thomas Borch, and Aaron Thompson (2019): ASA-CSSA-SSSA International Annual Meeting, 10-13 Nov. 2019, San Antonio, Texas
2019
A correlative bimodal surface imaging method to assess hyphae-rock interactions. Qafoku, Odeta, Rebecca A. Lybrand, Vaithiyalingam Shutthanandan, Rachel E. Gallery, Jason C. Austin, Paul A. Schroeder, Jennifer Fedenko, Erin Rooney, and Dragos G. Zaharescu (2019): Microscopy and Microanalysis, 25(S2), 2436-2437 Cross-CZO
2019
The Soil and Critical Zone Clay Factory: How Rock Weathers to Clay and Clay-Sized Minerals. Richter, Daniel deB. (2019): American Geophysical Union Fall Meeting, San Francisco, CA, December 9-13, 2019
2019
Quantification of mixed‐layer clays in multiple saturation states using NEWMOD2: Implications for the potassium uplift hypothesis. Schroeder, Paul A., Daniel D. Richter, and Jason C. Austin (2019): EuroClay 2019, Paris, France, 1-5 July 2019
2019
Controls of iron abundance and crystallinity on organomineral associations under contrasting long-term land use. Thompson, Aaron, Elizabeth K Coward, Daniel Markewitz, Daniel deB. Richter, Allan R Bacon, Alain F Plante (2019): American Geophysical Union Fall Meeting, San Francisco, CA, December 9-13, 2019
2019
Atmospheric Vs Geogenic: Using Long-Term Soil Experiments to Delineate between Lead (Pb) Sources in the Southern Piedmont. Wade, Anna, Daniel Richter, and Paul Heine (2019): ASA-CSSA-SSSA International Annual Meeting, 10-13 Nov. 2019, San Antonio, Texas
2018
Modifications of 2:1 clay minerals in a kaolinite dominated Ultisol under changing land-use regimes. Austin, Jason C., Amelia Perry, Daniel D. Richter, and Paul A. Schroeder (2018): Clays and Clay Minerals 66(1): 61-73
2018
Faster redox fluctuations can lead to higher iron reduction rates in humid forest soils. Barcellos, Diego, K. Taylor Cyle, Aaron Thompson (2018): Biogeochemistry 137 (3): 367-378 Cross-CZO
2018
Petrography of the gneisses from the Mary Lou Quarry in Clinton, SC: Implications for quantifying mineral compositions in the critical zone. Cannida, Tyler (2018): Center for Undergraduate Research Opportunities (CURO) Symposium, University of Georgia, Athens, 9 April 2018
2018
Ferrous iron oxidation under varying pO2 levels: The effect of Fe(III)/Al(III) oxide minerals and organic matter. Chen, Chunmei, and Aaron Thompson (2018): Environmental Science & Technology 52 (2): 597–606
2018
Influence of pO2 on iron redox cycling and anaerobic organic carbon mineralization in a humid tropical forest soil. Chen, Chunmei, Christof Meile, Jared Wilmoth, Diego Barcellos, and Aaron Thompson (2018): Environmental Science & Technology 52 (14): 7709-7719 Cross-CZO
2018
Carbon and oxygen isotope composition in soil carbon dioxide within deep Ultisols at the Calhoun CZO, South Carolina, USA. Cherkinsky A., Brecheisen Z , Richter D. (2018): Radiocarbon 60(5): 1357-1366
2018
Distribution of 14C and 137 Cs in the profile of Ultisol, Calhoun CZO. Cherkinsky, Alexander, Ravi Prasad, Daniel Richter, Hai Pan (2018): International Radiocarbon Conference, June 17-22, 2018, Trondheim, Norway
2018
Changes in clay mineral assemblages of legacy sediments in the Calhoun Critical Zone Observatory, SC: Evidence for anthropogenic landscape change. Jordan, Bear (2018): Center for Undergraduate Research Opportunities (CURO) Symposium, University of Georgia, Athens, 9 April 2018
2018
Examining the Role of Organic Compounds and Secondary Minerals on Ga/Al Fractionation in the Critical Zone. Justin B. Richardson*, Benjamin W. Kumpf, and Louis A. Derry (2018): Abstract 12c:345 presented at 2018 Goldschmidt Meeting, Boston, MA 12-17 August Cross-CZO
2018
Mercury sourcing and sequestration in weathering profiles at six Critical Zone Observatories. Richardson, Justin B., Arnulfo A. Aguirre, Heather L. Buss, A. Toby O'Geen, Xin Gu, Daniella M. Rempe, and Daniel deB. Richter (2018): Global Biogeochemical Cycles, 32(10):1542-1555 Cross-CZO National
2018
The fate of degraded biotites in the deep critical zone: Implications for the K-uplift hypothesis. Sanders, Sophia Chason (2018): Center for Undergraduate Research Opportunities (CURO) Symposium, University of Georgia, Athens, 9 April 2018
2018
Simultaneously quantifying ferrihydrite and goethite in natural sediments using the method of standard additions with X-ray absorption spectroscopy. Sun, J., Mailloux, B.J., Chillrud, S.N., van Geen, A., Thompson A., & Bostick, B.C. (2018): Chemical Geology 476: 248-259
2018
An Observational and Modeling Study of the Energy, Water, and Carbon Cycle at Calhoun Critical Zone. Tang, Yao (2018): PhD Dissertation, Civil Engineering, Georgia Institute of Technology, Atlanta, Georgia
2017
Clay mineral alterations in response to land-use change in the kaolinite dominated residual soil of the Calhoun Critical Zone Observatory. Austin, J.C.; Schroeder, P.A.; Perry, A. (2017): Critical Zone Science: Current Advances and Future Opportunities, Arlington, VA, 4-6 June, 2017
2017
Field measurements of soil iron and carbon cycling during spring warm-up in an aggrading pine forest at the Calhoun CZO. Barcellos, D, C Hodges, D Markewitz, E. Ardington, and A Thompson (2017): Soil Science Society of America International Annual Meeting, Tampa, FL, 22-25 Oct. 2017
2017
Hydrologic transport of dissolved inorganic carbon and its control on chemical weathering. Calabrese, S., Porporato, A., and Parolari, A.J. (2017): Journal of Geophysical Research: Earth Surface 122 (10): 2016-2032
2017
Hydrologic controls on chemical weathering in the Critical Zone. Calabrese, Salvatore, Tony Parolari, Amilcare Porporato (2017): Calhoun CZO 2017 Summer Science Meeting, Union, SC, 17-18 May 2017
2017
Iron reduction potential in upland soils in CCZO. Chen, Chunmei, Nadia Noor, Diego Barcellos, Caitlin Hodges, and Aaron Thompson (2017): Calhoun CZO 2017 Summer Science Meeting, Union, SC, 17-18 May 2017
2017
Water and carbon influence the distribution of iron reduction at the Calhoun CZO. Hodges, C., Mallard, J., Markewitz, D., and Thompson, A. (2017): University of Georgia Plant and Soil Symposium, Athens, GA
2017
Drivers and Variability of Iron Reduction in Upland Soils. Hodges, Caitlin (2017): M.S. Thesis, Department of Crop & Soil Sciences, University of Georgia
2017
Seasonal variation of Fe reduction at the Calhoun CZO. Hodges, Caitlin, John Mallard, Dan Markewitz, Aaron Thompson (2017): Calhoun CZO 2017 Summer Science Meeting, Union, SC, 17-18 May 2017
2017
Cross-scale perspectives on mineral weathering in the Critical Zone (Invited Presentation). Lybrand, Rebecca, Jason Austin, Paul A. Schroeder, Dragos Zaharescu, Rachel Gallery (2017): Geological Society of America Annual Meeting, Seattle, WA, 22-25 October, 2017 Cross-CZO
2017
Mercury in soils of the Calhoun Critical Zone Observatory: Importance of redox features in sequestration. Richardson, J.B. and D. deB. Richter (2017): Soil Science Society of America International Annual Meeting, Tampa, FL, 22-25 Oct. 2017
2017
Gilbert's soil production paradigm applied to a critical zone's fractionation of particle sizes. Richter, Daniel deB., Jason Austin, Robert S Anderson, Allan R Bacon, Susan L Brantley, Zachary Brecheisen, Paul A Schroeder, Anna Wade, W. Steven Holbrook, Virginia Marcon, Aaron Thompson (2017): American Geophysical Union 2017 Fall Meeting, New Orleans, Louisiana, 11-15 December 2017 Cross-CZO
2017
Quantifying mineral transformations in the Calhoun Critical Zone Observatory (CCZO): What is it and how much is there?. Schroeder, Paul A., Jason C. Austin, and Daniel deB. Richter (2017): Critical Zone Science: Current Advances and Future Opportunities, Arlington, VA, 4-6 June, 2017
2017
The potential for iron reduction in upland soils in Calhoun Critical Zone Observatory. Thompson, Aaron, Chunmei Chen, Nadia Noor, Caitlin Anne Hodges, Diego Barcellos, Daniel deB. Richter (2017): American Geophysical Union 2017 Fall Meeting, New Orleans, Louisiana, 11-15 December 2017
2017
Influence of land-use on the abundance of soil mineral reactivity at the Calhoun CZO. Villanueva, R.C., Mantripragada, N., and Thompson, A. (2017): University of Georgia Young Scholars Conference, Athens, GA
2016
Clay mineralogy of the deep core. Austin, J.C. (2016): Calhoun CZO 2016 Summer Science Meeting, Clinton, SC
2016
Changes in clay mineralogy of the Calhoun related to changes in land-use. Austin, J.C. (2016): Calhoun CZO 2016 Summer Science Meeting, Clinton, SC
2016
Semi-quantitative deep regolith clay mineralology of the Calhoun Critical Zone Observatory using NEWMOD 2. Austin, J.C.; P.A. Schroeder; and D.deB. Richter (2016): Clay Minerals Society Annual Meeting, Atlanta, GA
2016
Corresponding geochemical and geophysical weathering indices at the Calhoun Critical Zone Observatory. Bacon, A.R. (2016): Calhoun CZO 2016 Summer Science Meeting, Clinton, SC
2016
The dynamical system of weathering: deterministic and stochastic analysis. Calabrese, S., A. Parolari, A.M. Porporato (2016): American Geophysical Union 2016 Fall Meeting, San Francisco, CA
2016
Variation of iron reduction with depth over time at the Calhoun CZO. Hodges, C. (2016): Calhoun CZO 2016 Summer Science Meeting, Clinton, SC
2016
Critical zone architecture and processes: a geophysical perspective. Holbrook, W. Steven (2016): American Geophysical Union 2016 Fall Meeting, San Francisco, CA Cross-CZO National
2016
Clay mineral concentration with depth and land use history in the critical zone in Calhoun, South Carolina. Moraes, Anthony, Schroeder, Paul A. and Austin, Jason (2016): Geological Society of America Annual Meeting in Denver, Colorado, USA
2016
Propagation of hydroclimatic variability through the critical zone. Porporato, A.M., S. Calabrese, and A. Parolari (2016): American Geophysical Union 2016 Fall Meeting, San Francisco, CA
2016
Mapping depth to argillic horizon using electromagnetic induction on historically farmed soils within the Piedmont region of the United States. Ryland, R., D. Markewitz, and A. Thompson (2016): American Geophysical Union 2016 Fall Meeting, San Francisco, CA
2016
Deep regolith bulk mineralogy of the Calhoun Critical Zone Observatory using x-ray powder diffraction. Schroeder, P.A.; J.C. Austin; and D.deB. Richter (2016): Clay Minerals Society Annual Meeting, Atlanta, GA
2016
Reconnaissance oxygen and hydrogen stable isotope geochemistry of waters from the critical zone in the Iznik Lake basin region, Turkey. Schroeder, P.A.; Ö.I. Ece; C. Demirel; and A. Milewski (2016): 7th International Geochemistry Symposium
2016
Depth variation of iron crystallinity at the Calzone. Thompson, A. (2016): Calhoun CZO 2016 Summer Science Meeting, Clinton, SC
2016
The multiple roles of short-range-ordered iron minerals in soils. Thompson, A. (2016): Cornell University Biogeochemistry Seminar Series, Ithaca, NY
2015
The dependence on topography of the influence of soil erosion and deposition on the carbon cycle at the Calhoun Critical Zone Observatory. Bras, R.; Dialynas, Y.; Billings, S.; Richter, D.; Markewitz, D. (2015): American Geophysical Union Fall Meeting, December 2015, San Francisco, CA
2015
Linking spatial and temporal patterns of soil moisture with upland soil iron reduction. Hodges, C.; Markewitz, D.; Thompson, A. (2015): American Geophysical Union Fall Meeting, December 2015, San Francisco, CA
2015
Chapter 6 – Soil Geochemistry in the Critical Zone: Influence on Atmosphere, Surface- and Groundwater Composition. Perdrial J., Thompson A., Chorover J. (2015): Developments in Earth Surface Processes 19: 173–201 Cross-CZO
2015
A lumped, macroscopic approach to modeling soil moisture, CO2 transport, and chemical weathering in the critical zone. Porporato, A.; Parolari, A. (2015): American Geophysical Union Fall Meeting, December 2015, San Francisco, CA
2015
Geophysical and chemical weathering signatures across the deep weathered-unweathered granite boundary of the Calhoun Critical Zone Observatory. Richter, D.; Bacon, A.; Brantley, S.; Holbrook, S. (2015): American Geophysical Union Fall Meeting, December 2015, San Francisco, CA
2015
Behavior of natural iron nanoparticles in soils. Thompson, A. (2015): Georgia State University Geology Seminar Series, Atlanta, GA
2015
Iron dynamics at the Luquillo and Calhoun Critical Zone Observatories: Proposed linkages to C cycling. Thompson, A. (2015): University of Vermont Biogeochemistry Symposium Series Cross-CZO
2015
Chemical behavior of natural iron nanoparticles in soils. Thompson, A. (2015): University of Georgia Chemistry Seminar Series, Athens, GA
2015
Delineating climatic regions where upland soil iron reduction is potentially important at the ecosystem scale. Thompson, A.; Hodges, C.; Chadwick, O. (2015): American Geophysical Union Fall Meeting, December 2015, San Francisco, CA
2014
Assessment of Pedogenic Gibbsite as a Paleo-PCO2 Proxy Using a Modern Ultisol. Austin, J.C., and P.A. Schroeder (2014): Clays and Clay Minerals 62(4): 253-266
2014
Evolution of Soil, Ecosystem, and Critical Zone Research at the USDA FS Calhoun Experimental Forest. Richter, D. deB., A.R. Bacon, S.A. Billings, D. Binkley, M. Buford, M.A. Callaham, A.E. Curry, R.L. Fimmen, A. S. Grandy, P.R. Heine, M. Hofmockel, J.A. Jackson, E. LeMaster, J. Li, D. Markewitz, M.L. Mobley, M.W. Morrison, M.S. Strickland, T. Waldrop, and C. G. Wells (2014): In: USDA Forest Service Experimental Forests and Ranges: Research for the Long Term, Chapter: 18, Publisher: Springer Verlag, Editors: D.C. Hayes, S.L. Stout, R.H. Crawford, A.P. Hoover, pp. 405-433
2012
Effects of two-century land use changes on soil iron crystallinity and accumulation in Southeastern Piedmont region, USA. Li, Jianwei and Daniel Deb. Richter (2012): Geoderma 173-174: 184-191
2007
Humanity's transformation of Earth's soil: Pedology's new frontier. Richter, D. deB. (2007): Soil Science 172 (12): 957-967
27 Oct 2020 - The 17th International Clay Conference will be held July 12-16, 2021 in Istanbul, Turkey.
05 Jun 2020 - Four 2 minute pieces featuring Paul Schroeder talking about clay were aired on NPR's Pulse of the Planet in February 2020. Please see the links...
14 Mar 2019 - Calhoun weathering paper is out in Nature's Scientific Reports.
17 Aug 2018 - Paul Schroeder has written a remarkable new book on the story of clays in the critical zone. The book builds on a short article by the same name...
01 May 2017 - Anna Wade (visiting from Duke University) and Jay Austin (based at the University of Georgia) are collaborating by using X-ray Diffraction (XRD) to...
08 Feb 2017 - The Winter 2017 issue of UGA Graduate features an in-depth article about cross-CZO grad student Diego Barcellos
21 Nov 2016 - Four soil pits were installed in new Research Area 8 at the Calhoun CZO on 21-22 November 2016 for easy access for soil sampling down to 2 meters.
17 Oct 2016 - Eight soil pits were installed at the Calhoun CZO on 17-18 October 2016 for easy access for soil sampling down to 2 meters. Photo: Will Cook.
09 Jun 2016 - On Thursday 9 June 2016, Paul Schroeder led a several hour tour of the Hanson Aggregates Quarry (AKA Mary Lou Rock Quarry) in Clinton SC, about 15...
01 Apr 2014 - Wyoming Experts in Geophysics Visit the Calhoun CZO for Four Days of Measurements
01 Apr 2014 - Prof. John Quinton of Lancaster University interviews Prof. Richter for the BSSS on the changing model of soil, the topic of the 2013 Russell Lecture
Calhoun CZO.