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GS at the 2012 GSA Meeting

GS Exhibit Booth

Booth 806. Open during exhibit hours.

Joint Reception

5:45p - 7:30p. Tuesday 6 November 2012, CCC Ballroom C.

The Geochemical Society will again co-sponsor, along with MSA and the GSA-MGVP a ticketed reception. $10 for delegates, $5 for students. Tickets may be purchased at the door.

F. Earl Ingerson Lecture

09:50am. Tuesday, 6 November 2012, CCC 202AB

Abstract: Modern soil system constraints on reconstrucing deep-time atmospheric CO2: A new view of phanerozoic pCO2

MONTANEZ, Isabel, Department of Geology, Univ of California, Davis, CA 95616, ipmontanez@ucdavis.edu

Paleosol carbonate-based estimates of paleo-atmospheric CO2 play a prominent role in constraining radiative-forcing and climate sensitivity in the deep-time. Large uncertainty in mineral-based paleo-CO2 estimates reflects their sensitivity to soil-respired CO2 (Sz), a poorly constrained parameter due to a paucity of soil CO2 measurements during carbonate formation in modern soils and a lack of widely applicable proxies of paleo-soil CO­2. In this study, the δ13C values of carbonate and soil organic matter pairs from a literature compilation of 230 Holocene soil horizons are applied to a two-component CO2-mixing equation in order to define soil order-specific ranges of soil CO2 applicable for constraining Sz in their corresponding paleosol analogues. Equilibrium carbonate-soil organic matter (SOM) pairs, characterized by Δ13Ccarb-SOM values of 12 to 16‰ and most likely to record open system two-component CO2 mixing, indicate total soil CO2 contents during calcite formation of ~500 to 10,000 ppmv with lower values (25,000 ppmv) reflecting their seasonally driven dynamic hydrochemistry. A large subset of non-equilibrium pairs with Δ13C values exceeding 16‰ support the recently proposed hypothesis that pedogenic carbonate precipitation occurs during periods of low productivity in a soil atmosphere with a large component of atmospheric CO2. The results further indicate that measured δ13Ccarb and δ13CSOM in paleosols can be used to refine the proposed ranges of S(z) for study-specific reconstruction of paleo-atmospheric pCO2.The resulting soil CO2 estimates are compared with other recently proposed proxies of soil CO2 (mean annual precipitation and depth to the calcic nodular zone), and are utilized to recalibrate the Phanerozoic record of paleo-CO2 developed by previous studies using the pedogenic carbonate CO2-paleobarometer.

Sessions sponsored by the Geochemical Society

With strong volunteer support the Geochemical Society sponsored or co-sponsored over 260 geochemically-oriented presentations within 16 sessions.

T1. Sources, Transport, Fate, and Toxicology of Trace Elements and Organics in the Environment
International Association of GeoChemistry (IAGC); GSA Hydrogeology Division; GSA Environmental and Engineering Geology Division; GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; Geochemical Society
David T. Long, W.B. Lyons, LeeAnn Munk

Basic and applied research on trace elements and organics in the environment are encouraged. Topics include those that relate to understanding and modeling sources, transport and fate; human and ecosystem health; and environmental assessment and remediation.
Geochemistry | Environmental Geoscience | Geology and Health

T7. Progress in Forensic Geochemistry
GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; International Association of GeoChemistry (IAGC); Geochemical Society; GSA Geology and Society Division
Russell Harmon Harmon, Jose R. Almirall

The scope of forensic geochemistry has expanded due to rapid development of analytical tools for elemental and isotope ratio analyses. This session covers geochemical approaches to tracing environmental contaminants, materials provenancing, and other forensic applications.
Geochemistry | Environmental Geoscience

T8. Hydrochemistry and Biogeochemistry of Tropical Mountainous Rivers and Estuaries
GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; GSA Hydrogeology Division; International Association of GeoChemistry (IAGC); Geochemical Society
Steven Goldsmith, Russell Harmon, Ryan Moyer

We seek contributions that examine the hydrochemistry of tropical mountainous rivers and/or the biogeochemical cycling and fluxes of material delivered by tropical mountainous rivers to their associated estuarine and coastal waters.
Geochemistry | Geochemistry, Organic | Limnogeology

T12. A Healthy Dose of Quaternary Geochronology at the Shoreline: Applications of Luminescence and Other Dating Techniques to Resolving the Timing of Coastal, Estuarine, and Lake Shore Processes
GSA Quaternary Geology and Geomorphology Division; GSA Archaeological Geology Division; GSA Environmental and Engineering Geology Division; Geochemical Society
Shannon A. Mahan, Kenneth Lepper

We encourage presentations on applications and refinements for dating methods, such as OSL, ESR, fission track, radiocarbon, and cosmogenics, with a focus on constraining the timing and rates of Quaternary geologic processes around coastal shorelines.
Archaeological Geology | Geomorphology | Quaternary Geology

T46. Determining Chronological Environmental Records with Short Lived Isotopes: Problems and Solutions
Geochemical Society
Charles W. Homes, Gregg R. Brooks

In many projects, using of radioisotopes to establish chronologies of sedimentary systems, the criteria concerning the distribution of the radioisotopes are assumed or ignored resulting in misinterpretations. This session seeks presentations that address these problems.
Environmental Geoscience | Geochemistry | Geomorphology

T67. Innovative Classroom Approaches to Teaching Biogeochemistry
Council on Undergraduate Research; International Association of GeoChemistry (IAGC); Geochemical Society
Steven Goldsmith, Sarah K. Fortner, Stephen Levas

We seek contributions that entail innovative classroom approaches to teaching biogeochemistry at a variety of levels (K-12, undergraduate, and graduate). Of particular interest are approaches that blend research and classroom experiences.
Geoscience Education | Geochemistry | Limnogeology

T98. Hydrogeology and Geochemistry of Shales
Society of Economic Geologists; GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; GSA Environmental and Engineering Geology Division; Geochemical Society
Madeline E. Schreiber, John Chermak

This session will explore the hydrogeologic and geochemical characteristics of shale formations and their potential controls on water quality.
Hydrogeology | Geochemistry | Engineering Geology

T100. Biogeochemical Processes Influence the Environmental Fate of Contaminants: The Role of Hydrology and Ecology in the Chemical Evolution of Water
GSA Hydrogeology Division; Geochemical Society; GSA Environmental and Engineering Geology Division
Janet S. Herman, Karen C. Rice, Chuanhui Gu

Elucidation of the biogeochemical processes in watersheds that determine the chemical evolution of water improves our predictions of the environmental fate of contaminants. New insights depend upon interdisciplinary study including hydrology and ecology.
Hydrogeology | Geochemistry | Geomicrobiology

T106. Arsenic: Fate and Transport in Natural Waters and Aquifers from Basin to Pore-Space Scale
GSA Hydrogeology Division; GSA International Section; GSA Geology and Society Division; GSA Geology and Health Division; Geochemical Society; International Society for Groundwater for Sustainable Development; GSA Environmental and Engineering Geology Division
Prosun Bhattacharya, Abhijit Mukherjee, Ratan Dhar, Karen H. Johannesson, Lois Ongley

All aspects of earth and anthropogenic systems that may impact the occurrence, fate, transport, biogeochemical cycling, and sustainable mitigation of arsenic in water, rocks, and biological organisms will be discussed.
Hydrogeology | Geochemistry | Environmental Geoscience

T124. Oceans and Climates through Earth History: From Proxy Reconstructions to Model Assessments (Posters)
Cushman Foundation; Geochemical Society; Paleontological Society
Miriam E. Katz, Beth A. Christensen, David P. Gillikin, Alicia C.M. Kahn

This session brings together proxy and modeling studies to improve our understanding of rapid ocean and climate events, and shifts between long-term climate states, within the context of normal climate variability throughout Earth's history.
Paleoclimatology/Paleoceanography | Geochemistry | Paleontology, Diversity, Extinction, Origination

T127. Terrestrial Proxies of Paleoclimate and Paleoenvironment in Deep Time
GSA Sedimentary Geology Division; SEPM (Society for Sedimentary Geology); Geochemical Society; GSA Limnogeology Division
Lauren A. Michel, Jennifer M. Cotton, Ethan Hyland

This session focuses on advances in new proxy techniques as well as reconstructions of past environmental and climatic conditions for the terrestrial ecosystems as analogs for the impacts of future anthropogenically driven climate change.
Paleoclimatology/Paleoceanography | Geochemistry | Sediments, Clastic

T128. Investigating the Future of Uranium in the Geosciences: An Examination of Environmental Studies and Applications
GSA Hydrogeology Division; Geochemical Society
Jessica M. Morrison, Ginger E. Sigmon, Peter C. Burns

A diverse body of work spanning atomic-scale studies of uranium in the solid-state to environmental remediation of actinide contaminants will be presented with insights from speakers on topics including bioremediation, contaminant transport, and Fukushima.
Mineralogy/Crystallography | Geochemistry | Environmental Geoscience

T131. The Relationship between Silicic Plutons and Ignimbrites: Exploring the Contradictions
GSA Geophysics Division; Geochemical Society; GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division
Craig C. Lundstrom, D.S. Coleman

We solicit contributions aimed at discussion of the problem of upper crustal magmatic processes leading to formation of silicic plutons or silicic caldera systems and their relationship to each other.
Petrology, Igneous | Geochemistry | Geophysics/Tectonophysics/Seismology

T161. Detrital Zircon Provenance of Neoproterozoic to Lower Paleozoic Strata of Northern and Western Laurentia
GSA Sedimentary Geology Division; Geochemical Society; GSA International Section
Michael C. Pope, Rob Rainbird

This session focuses on detrital zircon provenance research of Neoproterozoic to Lower Paleozoic strata, particularly from northern and western Laurentia, to determine their sediment dispersal patterns, evolution of sediment provenance, and subtle tectonic events.
Sediments, Clastic | Tectonics | Stratigraphy

T166. Controls on Terrestrial Dispersed Organic Carbon d13C Values from Diagenesis to Climate
Geochemical Society; GSA Limnogeology Division
Brady Z. Foreman, A. Baczynski, Clement Bataille, Aaron Wood

We seek presentations that evaluate potential causes for d13C variability in dispersed organic carbon. The sources of variation can include sample preparation, diagenetic alteration, facies dependence, vegetation regime, atmospheric CO2, and local environmental conditions.
Stratigraphy | Geochemistry, Organic | Paleoclimatology/Paleoceanography

T181. Integrated Detrital Records of Orogenic Systems
Geochemical Society
Brian W. Romans, Amy L. Weislogel, Julie C. Fosdick

The record of orogenesis is contained within detritus deposited in sedimentary basins. This interdisciplinary session will highlight innovations in using detrital geo-/thermo-chronology and other geochemical provenance methods to better understand relationships of tectonics and sedimentation.