Goldschmidt 2017 will be held in Paris, France on August 13-18, 2017. The conference, an annual, international conference on geochemistry, is organized into 23 themes covering a wide range of topics.
For more information on this conference please visit https://goldschmidt.info/2017/index.
Sessions related to CZ science:
Convenors: Pamela Sullivan, Heather Buss
Keynote speaker: Jerome Gaillardet (Institut de Physique du Globe de Paris)
Invited Speaker: Lixin Jin (University of Texas)
Carbonate weathering rates are highly sensitive to modifications to salinity, water volumes, flow paths, pCO2, temperature and residence time that result from changes in climate, sea level and land cover. Over geologic time carbonate weathering is considered not to affect atmospheric CO2, yet at short-timescales (<3000 years) climatic and anthropogenic disturbances may impact global atmospheric carbon cycles. The structure and function of carbonate systems have been evaluated in terms of salinity, the presence/absence of soil/vegetation, the timing and amount of rainfall, temperature patterns and alterations to the ratio of calcite to dolomite weathering yet a unifying conceptual model has yet to emerge on the response of carbonate weathering in the Critical Zone to climate and land use/land cover change. We invite contributions that tackle carbonate weathering and its impact on the evolution of the Critical Zone, particularly those that integrate processes across disciplines including hydrogeology, biogeochemistry, geophysics, and geomorphology and those that employ isotope and modeling techniques to examine Critical Zone processes.
Convenors: Ruth Hindshaw, Catherine Hirst
Keynote: Jorien Vonk (Vrije Universiteit Amsterdam)
The Polar regions are currently experiencing a period of warming, resulting in the retreat of glaciers, an increase in the active layer depth of permafrost and a changing hydrological cycle. Decreased permafrost cover is expected to increase overall fluxes of solutes as the active layer deepens. Likewise, solute fluxes from glaciers are predicted to increase by virtue of the increased discharge as a result of a longer melt season. As highlighted in the recent 2016 Arctic Freshwater Synthesis report, the interplay between hydrology, microbiology and geochemistry in controlling the flux of inorganic and organic solutes and the downstream impacts on freshwater ecosystems is uncertain. For example, will changing environmental conditions (e.g. hydrology) influence the cycling of metals (e.g., calcium and iron) and carbon (inorganic and organic) and in turn, the microbial communities which mediate many of the chemical reactions occurring in these environments? In this session we invite contributions from geochemistry, hydrochemistry, modelling and microbiology: essentially from all researchers seeking to understand biogeochemical cycling in these special environments with the aim of promoting dialogue between often separate disciplines.
Convenors: Grit Steinhoefel, Talitha Santini, Ashlee Dere, Pamela Sullivan, Claude Hillaire-Marcel, Mark Baskaran
Keynote: François Chabaux (University of Strasbourg)
The breakdown of rock into soil is controlled by the complex interplay of geochemical, geomorphological, hydrological and biological processes together with the effect of human activities. The identification and quantification of the processes that govern the evolution of the Critical Zone– Earth’s living skin – requires multiple tools from across an array of disciplines. The application of multiple isotope systems, including traditional isotopes (e.g., of C, H, O, S, Sr), cosmogenic nuclides (e.g. 10Be, 26Al), fallout radionuclides (e.g. 137Cs, 239/240Pu), short-lived natural U and Th-series radionuclides (e.g., 234U, 210Po, 228Th, 228Ra, 210Pb and 226Ra), and non-traditional stable isotopes (e.g., of Li, Mg, Si, Ca, Fe, Cr, Zn, Cu), together with other geochemical and mineralogical tracers (e.g., element ratios, alteration indices), enable us to decipher linkages and mechanisms of weathering processes and quantify dissolved and particulate fluxes across varying lithologies, tectonic settings, climatic conditions and anthropogenic influences– we call this initiative CZ-Tope. The goals are to identify dominant weathering and erosion drivers, to quantify rates of weathering, erosion, and sediment accumulation, and to consider the implications of these processes for global biogeochemical cycles. This session invites contributions investigating weathering, erosion and sediment accumulation across broad spatial (mineral to catchment to depositional basin) and temporal scales (days to months to millennia and beyond) and in diverse environmental settings. Approaches may include laboratory experiments, modeling, development and application of proxies, and field investigations and inter-comparisons.
Convenors: Julia Perdrial, Paul Floury, Philippe Négrel, Sophie Opfergelt
Keynote: Jérôme Gaillardet (Institut de Physique du Globe de Paris)
Pollution, droughts, floods, recharge processes and water provenance, ground-surface water connection, weathering and erosion rate are deeply connected to critical zone (CZ) structure and function. To trace important processes such as ground water recharge, geochemical reactions e.g. along flow paths as well as water provenance and transit times several geochemical tools (i.e. major, trace elements, isotopes) are used. However, how much can we learn about CZ processes from probing stream and ground water and what are the limitations? How can we integrate temporal (inter-annual, seasonal, diel) variations, the balance between event and base flow dynamics to trace the variety of (bio)geochemical processes shaping the CZ? We invite contributions that link field observations and /or models to biogeochemical, hydrological, ecological, biological and pedological processes in traditional and novel ways to relate water dynamics back to CZ function in a time of accelerated global change.