Martine M. Savard
Geological Survey of Canada, Canada 
Anthropogenic N – A global issue examined at regional scale through the prism of stable isotopes

Martine M. Savard received her Ph.D. in 1991 from University of Ottawa where she specialized in stable isotope geochemistry applied to the evolution of sedimentary carbonate rocks. Martine joined the Geological Survey of Canada (GSC) in 1990, applied her expertise to the study of Pb-Zn carbonate-hosted deposits and proposed new methods of exploration for this type of deposits. She is adjunct professor at INRS-ETE where she has supervised over 20 graduate students. Martine Savard is the head of the Delta-Lab, a stable isotope laboratory that she now dedicates to addressing environmental issues and exploring the applicability of clumped isotopes in carbonate sequences.

On solving environmental issues, Martine and her team have addressed several socio-economic questions such as the sustainable development of groundwater resources in Eastern Canada, and distinguishing natural and anthropogenic contaminants in air, soils and water. She is now pursuing research on tree-ring geochemistry to reconstruct changes of air quality and soil chemistry in industrial centers, and past hydric regimes near major hydropower centers. Savard has been the leader of several multi-institutional and inter-disciplinary projects. She was the main organizer of several international thematic sessions and symposia over the years.

Isotopic communication across the water - rock interface: Preservation in solids and signatures in moving fluids

Jennifer is an Assistant Professor in the Department of Geology at the University of Illinois Urbana-Champaign.  She joined the faculty in 2015 after completing an NSF postdoctoral fellowship at Stanford University.  She holds a Ph.D. from the University of California Berkeley Department of Earth and Planetary Sciences and an M.S. from the University of Arizona Department of Hydrology and Water Resources.  Her research centers on the relationship between the physical heterogeneity and chemical reactivity of aquifers, and ways in which stable isotope ratios are sensitive to this relationship.

Jennifer Druhan
University of Illinois Urbana-Champaign, USA 
Nathaniel R. Warner
 Pennsylvania State University, USA
The geochemical and environmental issues related to oil and natural gas production from shale and tight reservoirs

Nathaniel Warner is currently an Assistant Professor at Pennsylvania State University in the Department of Civil and Environmental Engineering. Previously, Dr. Warner received a BA from Hamilton College where he majored in Geology, an MS in Hydrogeology from Miami University in Oxford, Ohio and a PhD in Earth and Ocean Sciences from Duke University. He was the Joseph B Obering Postdoctoral Fellow, Dartmouth College, Department of Earth Sciences from 2013-2015. Hiscurrent research focuses on using B, Sr, and Ra isotope geochemistry to better understand the processes controlling 1) salinization of freshwater 2) the fate and transport of metals in oil and gas produced waters once released to the environment, and 3) treatment technologies for oil and gas produced waters. Dr. Warner’slab group hasused Sr and Ra isotopes to trace the accumulation of metals associated with oil and gas wastewaters in both sediment and freshwater bivalves. His work has been published in Proceedings of the National Academy of Sciences-USA, Environmental Science and Technology, Applied Geochemistry,GeochimicaetCosmochimicaActa, Chemical Geology, and Environmental Science: Processes and Impacts. Dr. Warner’s paper “Impacts of Shale Gas Wastewater Disposal on Water Quality in Western Pennsylvania” was awarded the Best Article 2013 from the Science from Environmental Science and Technology Editorial Board.

Unusual fractionation of mercury isotopes in surface environments

Jiubin Chen is at the Institute of Surface-Earth System Science (ISESS) of Tianjin University (China). He completed an undergraduate degree in Earth science in the Changchun Institute of Geology in China. He earned both his Master (DEA) and PhD degrees at the Institut de Physique du Globe de Paris, University Paris 7 (France), where he studied the geochemistry of metal isotopes (Zn, Fe, Cu) in river system, and this was followed by a post-doc at Trent University (Canada) on Hg isotopes. He then worked in the Institute of Geochemistry, Chinese Academy of Sciences (IGCAS) in Guiyang (China). Currently, he studies the geochemistry of metal isotopes, focusing on methodology development, fractionation mechanisms and experiments, and potential applications to different environments. He has developed methods for purifying Zn, Hg, and Ga from geological matrices for precise isotope analysis for tracing pollution sources and for understanding the biogeochemical cycling of metals.

Jiubin Chen
Tianjin University, China
George A. Chelnokov
 Far East Geological Institute FEB RAS, Russia
Mineral waters of the Sakhalin Island (Far East of Russia)

Dr. George A. Chelnokov, Far East Geological Institute Far East Branch of Russian Academy of Sciences, Head of the Natural-anthropohenic systems Department, Chief of the Laboratory of Hypergene Processes Geochemistry.

George Chelnokov is a hydrogeochemist with over 20 years research experience into various aspects of the geochemistry of fluid-rock interactions. The focus of his scientific work is on understanding of geochemistry and genesis of the different types of groundwater fluids of the Far East of Russia, and on environmental aspects associated with the exploitation of groundwaters. The researches are aimed at obtaining new data on the composition and origin of groundwater and associated gases, solving geothermal energy issues, estimating the balneological properties of natural objects.     

Arsenic in the hot springs in the Yunnan-Sichuan-Tibet Geothermal Province, China

Qinghai Guo holds a Ph.D. Degree from China University of Geosciences (CUG) and is currently a full professor of the university (CUG). His research interest is in geochemistry of high-temperature geothermal fluid. In recent years, He has published 60 papers in international peer-reviewed journals, serving as the first author for 25 of them. His current NSFC projects include “Relevance and environmental fate of methylthiolated arsenates in geothermal waters (No. 41861134028)”, “Formation, transport and transformation of thiotungstates in sulfide-rich hot springs as well as their environmental geochemical significance (No. 41772370)”, and “Speciation transformation of typical toxic elements (fluorine, arsenic and boron) from high-temperature geothermal fluid discharge and its environmental geological effects (No. 41572335)”. Prof. Qinghai Guo was awarded the Ebelmen Award by International Association of Geochemistry in 2010.

Qinghai Guo
 China University of Geosciences, China

Sergey V. Alexeev
 Institute of the Earth's Crust, SB RAS, Russia
Brines of Siberian platform. Geochemistry and Prospects of Processing.

Dr. Sergey V. Alexeev, Institute of the Earth's Crust, Siberian Branch of Russian Academy of Science (IEC SB RAS), Head of Hydrogeology and Engineering Geology Dpt., running two laboratories: Lab. of Hydrogeology and Lab. of Engineering Geology and Geoecology. He's received his Ph.D. and Dr. of Sci. degree in 1987 and 2008 from IEC SB RAS where he specialized in hydrogeology of the permafrost. The current research focuses on geochemical processes in the water-rock system. Sergey Alexeev tries to solve one of the fundamental problems of modern hydrogeology and genetic hydrogeochemistry: the origin of deep-seated chloride calcium brines on Siberian Platform.      

Determination of weathering rates by analyzing U-series nuclides in weathering profiles: principle and applications

François Chabaux is Professor of Geoscience and Geochemistry at the “Ecole et Observatoire des Sciences de la Terre (EOST)” at the University of Strasbourg, France. François Chabaux was awarded a Ph.D. at the University Paris 7, France in 1993. From 1987 to 1993, he was research and teaching Assistant at Université Paris 7 and then at the IPGP, France. In 1993-1994, he was Research Associate at the University of Cambridge, UK. He was appointed Assistant Professor for Geochemistry at the University of Strasbourg, France in 1994, Full Professor in 1998 and Professor CE (Distinguished Professor) in 2012. François Chabaux has focused his scientific activities for the last 25 years on the study of the mechanisms and time constants of weathering and erosion processes in critical zone by developing and using the elemental and isotopic geochemistry approaches. François has been highly involved in the development and application of the methodology of U-series nuclides to constrain the time scales of weathering and erosion processes in the critical zone. He was also involved in the application and development of geochemical tracing approaches, including the U-Sr isotopic coupling, the new stable (Ca, B, Li) isotopes, and the more classical (Sr, Nd, Pb) radiogenic isotopes, to depict the main processes involved in biogeochemical and hydrogeochemical cycles. More recently he also investigated the nature of water-rock interactions controlling the chemical composition of waters in watersheds and aquifers by applying coupled hydrogeochemical modeling approaches. An important part of his work was carried out on the Strengbach watershed (OHGE: Observatoire HydroGéochimique de l’Environnement), in Vosges mountains, France, contributing largely to making this watershed one of the current reference or emblematic sites of the French critical zone observatory network (OZCAR). All his scientific activity was conducted as part of a team activity, the Strasbourg isotopic geochemistry group, which he structured and animated from 2001 to 2013. François Chabaux is Associate Editor of Applied Geochemistry and of «Comptes Rendus Geoscience », the Scientific Journal of the French Science Academy. He is a member of the editorial board of Chemical Geology. He is member of the scientific council of the « Institut National des Sciences de l’Univers (INSU)/ National Institute for Earth Sciences and Astronomy » in CNRS, France and from 2012 to 2016 member of the scientific expertise committees of the ANR (the French National Agency for Research). He was a member (2008-2010) of the European Association for Geochemistry (EAG) council and was awarded 2015-16 Outreach Lecturer of the EAG-GS Outreach Program to Africa.

François Chabaux
 University of Strasbourg, France