Group leaders


Pr. Cécile Gautheron

Rare gases geochemist, GEOPS
I am a professor of geochemistry and mineralogy at the Paris-Saclay University (France). My research aims to quantify the geodynamic evolution of Earth’s continental crust via the determination of weathering and exhumation timings and rates. In order to quantify these phenomena, I apply and develop dating tools, such as (U–Th)/4He and (U–Th)/21Ne thermochronometers/chronometers and attempts to understand their theoretical behavior. I use multi-disciplinary approaches to study rare gas diffusion processes in minerals, from the atomic to macroscopic scales and from seconds to geological timescales. My actual main research targets are focused on the understanding of past weathering events such as laterite formation in Brazil, Suriname, French Guiana and Malawi, and supergene ore-deposit formation.

Dr Zuzana Fekiacova-Castanet

Isotope geochemist, CEREGE
I am isotope geochemist with emphasis on Soil and Environmental Sciences. I am an INRAE research fellow at Sustainable Environment Group, at CEREGE Aix en Provence, France. I did my PhD in Earth Sciences at Max-Planck Institute for Chemistry and J. J. Gutenberg University, Mainz, Germany, followed by an EU Marie-Curie fellowship at the Geology department of the Ecole Normale Supérieure de Lyon. My research focuses on the use of stable isotopes as environmental tracers with the aim to understand the mechanisms and processes that control, and the factors that impact, the soil evolution. I work on a range of soils from various natural and human-impacted environments and I am particularly interested in (i) the fate and behavior of Fe in soils during pedogenetic processes, mineral transformations and Fe redistribution among different soil constituents, (ii) the impact of present-day and historical anthropogenic activities on soils and environment and (iii) the sources, redistribution and recycling of anthropogenic metals (Cu, Zn) in soil and environment.

Dr. Thierry Allard

Environmental mineralogist, IMPMC, Paris
I am researcher at the Centre National de la Recherche Scientifique (CNRS), in the environmental mineralogy team of IMPMC, Paris. I made my PhD in 1994 at the Laboratory of Mineralogy Cristallography of Paris (LMCP) on radiation effects in clay minerals and geochemistry of uranium. My main fields of interest are mineralogy, crystal chemistry, spectroscopy, and environment including weathering and erosion. My activity these last years concerned mainly (i) the tracing of weathering and erosion in tropical rivers from Amazonia using structural chemistry of particulate and colloidal matter, (ii) radiation-induced defects in clay minerals used to reveal ancient pathways of radioelements in unconformity-type uranium deposits or to date kaolinites from laterites in India and the Amazon Basin. The dating approach relies on electronic point defects produced in clay minerals by natural radioactivity, and by experimental irradiations. The case of laterite dating is aimed to relate the ages of main weathering events to regional or global paleoclimates, in order to contribute to the reconstruction of the evolution of continental surfaces.

Dr Julien Bouchez

Isotope geochemist, critical zone scientist, IPG Paris
I am a CNRS Junior Researcher at Institut de Physique du Globe de Paris. My core research activity is focused towards a better understanding of the roles played by erosion, weathering and river transport in the global biogeochemical cycles and the dynamics of the Critical Zone. I am in particular involved in the development of novel geochemical tracers for weathering rates and processes, such as stable isotope systems of metal and metalloid elements (Li, B, Si, Sr), through a combination of analytical work and modeling. I have been conducting several projects on solute and sediment chemistry of the largest rivers of the world (Amazon, Mackenzie, Changiang) and I am involved in research activities linked to the international Critical Zone network of observatories, and in the French network of critical zone (OZCAR National Infrastructure, CNRS).

Dr. Jérome Roques

Numerical Simulations, IJCLab
I am an assistant professor at the Laboratoire de Physique des 2 infinis Irène Joliot-Curie (IJCLab) of Paris-Saclay University. His main field of interest is molecular simulations (periodic-DFT, ab-initio molecular dynamics and Monte Carlo simulations). He works on atomic diffusion processes in minerals and actinides complexation using DFT et Monte Carlo simulations. He supervised 9 PhD, 3 post-docs and numerous master students on pluridisciplinary aspects. He published more than 70 articles in theoretical chemistry in international journals.

Pr. Jean Braun

GFZ, Germany
I am a professor at German Research Centre for Geosciences (GFZ), Berlin, Germany and head of the Earth Surface Process Modelling department. I was a senior member of the Institut Universitaire de France, fellow of the Canadian Institute for Advanced Research, and I am a specialist in numerical model development in the Earth sciences, including geomorphology, tectonics, thermochronology, hydrogeology and basin dynamics. I have many years´ experience of collaboration with specialists in a wide range of fields, including structural geology, geomorphology (including fluvial, glacial geomorphology and soil dynamics), thermochronology, basin analysis, hydrology, seismography, metamorphic petrology, mantle flow (dynamic topography). Combining my knowledge of Earth sciences with my training in physics and mathematics, I develop and use sophisticated numerical models and methods to interpret the geological record and extract from it constraints on the physical processes at play in the Earth´s interior and near its surface.

Pr. Adriana Maria Coimbra Horbe

UnB, Brazilia, Brazil
I am a Professor at Instituto de Geociências, Universidade de Brasília, Brazil. My research theme is geochemistry of weathering process with emphasis in Amazonia and is furthermore interested in isotope geochemistry and airborne gamma ray spectrometry/remote sensing for geological mapping and the geomorphology studies in regolith landscape. I work in multidisciplinary international and national groups.

Dr. Guilherme Taitson Bueno

I am a researcher in the Laboratory of Geomorphology, Pedology and Physical Geography (LABOGEF) at the Universidade Federal de Goiás, Brazil, Brazil. I am a geographer specialist on soil/relief interactions and has an expertise in geochronology (post-doc at IMPMC). I am working on laterite formation in Brazil and has access to some ore deposits in the studied area.

Dr. Jean-Yves Roig

Structural geologist, BRGM, Orléans, France
I am a senior researcher at the French Geological Survey BRGM, Orleans. I am a structural geologist with an important experience in geological mapping, petrostructural analysis (metamorphic and plutonic), tectonics and geodynamics. I worked in different countries in various geological environments for several topics: volcanic context for geothermy (French West Indies), geological mapping of basement related to ore deposits (Ghana, Angola, Cameroun, Madagascar, French Guiana, Suriname, Brazil) regolith mapping for oil reservoirs (Madagascar) or ore deposits (New Caledonia), structural expertise in basin geology (Ghana) and fold and thrust belts (Ghana, France). From now 10 years, I am also project manager for international and applied geology projects and I am now in charge of the Source to Sink research project in collaboration with TOTAL, Universities, and European Geological Surveys, and makes the cohesion inside the team project.

Massimo Dall’asta

TOTAL, EP/EXPLO/GTS/ISS, Technical & Scientific Center, Pau, France
I am a Senior Researcher in the R&D at TOTAL, Pau. He is a geologist with a large experience in Seismic and Sequence Stratigraphic interpretation and in sedimentary basins analysis. He has been working in Exploration for more than 20 years in different geographical areas: West Africa, South America, Far East, North Sea etc.., and in various geodynamic and geological setting Passive Margins, Large deltas, Rift, volcanic margins. He is now in charge of the Research topic “Source To Sink” in the R&D structure of Total and makes the link between TOTAL and the different universities and Institutes involved in the project. The main geographical areas of the R&D activities are actually around the Mozambico Channel (Collaboration Program with Ifremer and others Universities called “Pamela” – PAssive MArgin LAboratory), the Austral Africa (in collaboration with Rennes University) and the Equatorial Atlantic conjugate margins (in collaboration with BRGM and GET –Toulouse). Sedimentary budgets, Chemical Vs. Physical erosion, Source tracking and Provenance studies in relation with the nature of the substratum and the effects of the climate, are his main topics.



Dr. Damien Calmels

Isotope geochemist, GEOPS
I am an assistant professor at the GEOPS laboratory, University Paris-Saclay and a geochemist specialized in both “traditional” (C, H, O, S, Δ47) and “non-traditional” (Li, Mg) stable isotope geochemistry. My main research activity is focused on a better understanding of global biogeochemical cycles through the study of erosion and weathering processes at catchment scale. I am especially interested in the link between weathering, climate and the biosphere using both analytical and modeling technics. He has been funded by the French network of river basins (RBV) and the French-Chinese bilateral ANR program.

Pr. Cécile Quantin

Isotope geochemist and soil scientist, GEOPS
I am a full professor in Soil Sciences since 2010 at Université Paris Saclay and have a strong track record in the studies of lateritic environments, particularly regarding their functioning, the characterization of the metal-bearing minerals and the parameters controlling their weathering. I was (co-)supervising 4 PhD students on that topics and was PI of two national EC2CO-CNRS projects (Isotopic composition of nickel as a new discriminant to study the mobility of natural and anthropogenic Ni, 2011-2012; Contribution des sols à la contamination en métaux et HAP des rivières: approche multi-traceurs 2014-2015), one national Tellus-CNRS project (Etude expérimentale du fractionnement isotopique du nickel: contribution à l’étude du cycle géochimique de surface, 2016-2017) and of the European project “the Nickel Dynamics in impacted ultramaFIC Soils” (n°318123, IRSES – FP7, 2013- 2017). I was/am also involved in cooperation projects concerning metal dynamics in tropical areas (program ACI-FNS EC2CO-PNBC 2003-2005 (dynamics of Fe and Mn in rice fields in Thailand); program Ciências sem Fronteiras (Brazil), 2013-2015; program CEFIPRA (India), 2016-2018, PI Y. Sivry, IPGP).

Dr Sophie Sepulcre

Paleoclimatologist, Geochemist, GEOPS
I am a paleoclimatologist, with a special interest for the Quaternary time-period. I am a lecturer from the Paris-Saclay University, working at GEOPS in the “Alterations” and the “Paleoclimate and Sedimentary Dynamics” groups. I did my PhD and post-doctoral research in paleoceanography at CEREGE before working at GEOPS. I especially use a combination of various geochemical proxies to reconstruct past changes in the climate system (oxygen and carbon stable isotopes, elemental ratios) and to improve the geochronological framework of the records (14C, U-Series). I am also interested in developing new proxies or innovative applications. My research is thus focused on reconstructing past climate changes from sedimentary archives covering about the last 2 million years and on understanding the underlying processes (glacial-interglacial cycles, ocean circulation, global Carbon cycle).

Pr. Etienne Balan

Environmental mineralogist, IMPMC, Paris
I am a professor at Sorbonne University, in the environmental mineralogy team of IMPMC, Paris. I made my PhD in 2000 at the Laboratory of Mineralogy Cristallography of Paris (LMCP) on the evolution of silicate minerals during lateritic weathering processes. My main research objectives are to interpret the defective structure of minerals in terms of archives of natural processes. To this end, I determine the nature and properties of structural defects in contextualized samples by combining spectroscopic and theoretical approaches. My recent works relate to the identification of hydrous defects in nominally anhydrous minerals, the fossilization mechanisms of biomaterials, and the crystal-chemistry of serpentine and clay minerals in tropical weathering environments.

Dr. Guillaume Morin

Environmental mineralogist, IMPMC, Paris
Guillaume Morin ( is Research Director at CNRS and head of the “Environmental Mineralogy” group of IMPMC. His expertise in environmental chemistry includes iron and trace metals speciation in natural and engineered systems, mineral-microorganisms interactions, and surface reactivity of nanominerals for pollutant scavenging and degradation.

Dr. Pierre Agrinier

Stable isotope geochemist, IPG Paris
I am a senior researcher at Institut de Physique du Globe de Paris (IPGP). My research is focused on water-rock interactions and fluid transports in the oceanic crust and the continental crust, with the help of stable isotope ratios (O, C, H, Cl) of minerals and fluids (water, gases) to reconstruct their history.

Dr Claire Rollion-Bard

Geochemist, IPG Paris
I am a research engineer at Institut de Physique du Globe de Paris (IPGP) and my research is focused on the processes of biomineralisation and their impact on the record of environmental proxies, mainly in bicarbonates (corals, foraminifera…). This better understanding of biomineralisation is realized via the measurements of stable isotopes (Li, B, O, C) and trace element ratios by in situ techniques such as ion microprobe and laser ablation. I have been funded by a Marie Sklodowska-Curie Action ITN, and the French-German bilateral ANR program.

Dr. Luís Felipe Soares Cherem

I am a researcher in the Laboratory of Geomorphology, Pedology and Physical Geography (LABOGEF) at the Universidade Federal de Goiás, Brazil. I am a physical geographer specialist on tropical geomorphology and has an expertise in Quaternary Geochronology with co-tutele doctorate at CEREGE, France. I was coordinating 2 projects of long-term landscape dynamics and is a participant in an active CAPES/COFECUB (869/2015): ‘Evolution of the relief of the eastern portion of Brazil: A study based on geochronology via cosmogenic isotope 10Be’.

Dr Jean-Pierre GIRARD

Expert in Inorganic Geochemistry, TOTAL, EP/EXPLO/GTS/ISS, Technical & Scientific Center, Pau, France
J-P Girard is a specialist in low temperature geochemistry and reservoir diagenesis. He received a Doctorate in Applied Geology (1985) from University of Poitiers, France, and a PhD in Low Temperature Geochemistry & Diagenesis (1990) from University of Marseilles, France. He started out as a Research Associate at Case Western Reserve University, Cleveland, USA, specializing in isotope geochemistry, then held several positions at the French Geological Survey in Orleans, France, mainly as project leader and R&D program coordinator. He joined TOTAL E&P in 2007 as a senior specialist and was appointed Senior Expert in Inorganic Geochemistry in 2016. JP Girard has carried out significant research in using stable isotopes in soils for paleo-climatic reconstructions. His prime area of activity is in sandstone-carbonate diagenetic processes and their impact on reservoir quality.

Dr. Charlotte Fillon

Geologist, TOTAL, EP/EXPLO/GTS/ISS, Technical & Scientific Center, Pau, France
I am a Geologist in the R&D Program of TotaEnergies working on Convergent Margins evolution and Source-to-Sink topics. In this team, I work on new geological concepts with Academics and transfer these ideas into our exploration teams. I have an academic career path and joined Total in 2017. During my research experiences, I focused on the study of the growth mechanisms and fate of mountain ranges through the prism of tectonic/sedimentation interactions, and by applying new techniques such as numerical modelling and low temperature thermochronology. After working for several years on the Pyrenean mountain range, my post-doctoral experiences have allowed me to extend my research to other systems, such as the Alps, the Brooks Range (Alaska) and the Zagros. Currently, I continue to work on the interactions between mountain ranges and their basins, and in particular on the post-orogenic evolution of mountain ranges and on the quantification methods of vertical motions at geological and human time scale.

Dr. Geoffrey Aertgeerts

Geologist, BRGM, French Guiana, France
I am junior researcher at the French Geological Survey BRGM. I started my career as a geologist in the French Geological Survey in Nantes, where I worked on natural environmental asbestos mapping. Then, I started a PhD in the Planetology and Geodynamic Laboratory of Nantes, where I worked on the relation between South Armorican mafic-ultramafic rocks petro-structural evolution and crystallization. Now, I am a regional geologist in French Geological Survey in Cayenne (French Guiana) and manages several projects focused on chemical and physical characterization of laterite, geological mapping, natural risks, hydro-sedimentary dynamics of the littoral and Guyana shield scale erosion processes.

Participants PhD – post-doc


Claire Ansart, PhD Student, Université Paris Saclay

Geochemist and mineralogist
I am a 3rd year PhD student in GEOPS at University Paris Saclay, team ALTS. The aim of my study is to characterize different weathering profiles in order to have a better understanding of weathering processes that had occurred through time to form such deep regolith. A geochemical approach (mass balance, trace element and REE element study, oxygen and hydrogen isotopes) coupled with mineralogical investigations (XRD, SEM-EDS, FTIR and µXRD, µXANES and µXRF on synchrotron) are employed. Besides, another part of this work consists in dating by (U-Th)/He Fe-hydroxides or Fe-oxides, i.e. goethite or hematite, of duricrusts from Suriname and Brazil. These works will highlight major weathering episodes that led to duricrust formation and will be associated with weathering processes and climatic variations determine in the first part. While much of seminal geochemical and mineralogical studies were performed on deep tropical soil profiles associated to mining investigations, only a handful of recent studies have aimed at a better characterization of weathering processes and rates in these contexts.

Beatrix Heller

Geochemist and mineralogist, GEOPS, IMPMC
I am doing my PhD in the RECA project and am part of the Alteration group at GEOPS, Paris Saclay University, Orsay, France and the Environmental Mineralogy group at IMPMC, Sorbonne University, Paris, France. I did my studies in Earth Sciences at Georg-August University of Göttingen, Germany, University of São Paulo, Brazil and Charles University Prague, Czech Republic. My current research focuses on the geochronology of lateritic profiles in Amazonia, using (U-Th)/He dating of iron oxides and ESR dating of clay minerals and linking the latter with mineralogical and geochemical methods. I work mainly on the evolution of stable cratonic areas and I am interested in unconventional geochronological methods such as (U-Th)/He dating of iron oxides, titanite or rutile and the combination of mineralogical and geochemical with geochronological methods.

Damien Guinoiseau

Geochemist and Mineralogist, GEOPS, IMPMC
I am an assistant professor at the GEOPS Laboratory, University Paris-Saclay and an isotope geochemist. As a researcher, I aim at constraining the biogeochemical cycles in the different environments of the Critical Zone (soil, river, ocean, atmosphere) using non-traditional isotope systems (Li, Si, Cd, Cu, Zn…). I am also combining field and laboratory observations supported by modelling to identify the key weathering processes occurring at a catchment scale. In the frame of the RECA project, I am identifying the tropical weathering history recorded in lateritic weathering profiles combining dating tools with isotopic proxies such as Si and Li isotopes, two tracers of weathering intensity.

Maximilien Mathian

Geochronologist and mineralogist, GEOPS, IMPMC
I’m a junior researcher in environmental mineralogy and geochronology. I recently joined the University of New Caledonia (ISEA Laboratory) as a contractual assistant professor after two years as a postdoctoral researcher at the GEOPS laboratory (Université Paris-Saclay). I use the crossing of mineralogical and geochemical analyses with minerals dating (EPR dating of phyllosilicates and (U-Th)/He of iron oxides and oxyhydroxides) to reconstruct the geological evolution of tropical systems. I’m particularly interested to (I) evaluate the impact of distinct climatic and tectonic events on the geomorphological evolution of continents; (II) investigate the evolution of crystallochemistry of secondary minerals to decipher the dynamic of tropical regoliths ; (III) develop new spectroscopic-based method to characterize the crystallochemistry of phyllosilicate-rich samples. I did my PhD in 2018 at the IMPMC (Sorbonne Université) under the supervision of the Dr. T. Allard. Back then, my research was focused on the improvement of the Electron Paramagnetic Resonance spectroscopy dating of phyllosilicates and its application on loose lateritic regoliths from different geodynamic contexts (India, Brazil and Australia). After demonstrating the correlation between precipitation pulses and the formation of generations of kaolinites in these regoliths, I joined the GEOPS laboratory to work on the “Source-To-Sink Mozambique” Project in partnership with Total and the Rennes-2 University. Under the supervision of the Pr. C. Gautheron, and in connection with the RECA project, I have been able to date indurated regoliths to improve the chronology of establishement of the different geomorphological surfaces of the Malawian Plateau (Malawi). At the UNC, my current research project focuses on the refinement of the chronology and of our understanding of the fluviolacustral tropical sedimentary system (lateritic clastes) of southern New Caledonia.

Karina P. P. Marques, Ph.D. in Sciences, University of São Paulo (Brazil)

Soil Scientist and Geomorphologist
I hold a Ph.D. in Sciences at the University of São Paulo (Brazil) in partnership with Sorbonne Université and University Paris Saclay (France). The aim of my research is to investigate thick weathering profiles and to date the corresponding supergene minerals in order to discuss the landscape evolution of intertropical regions. Quantitative geomorphological analysis is performed to investigate the controlling mechanisms of landscape evolution. In addition, mineralogical analysis (XRD, XRF, SEM-EDS, and TG-DTA) coupled with iron oxide dating by (U-Th)/He are carried out to unravel and constrain the weathering phases associated with the formation of Ferralsols and ferruginous duricrusts. Therefore, the long and complex evolution of thick weathering profiles and their relationship with the major climate changes and landscape evolution are addressed.


The GEOPS (Geosciences Paris-Saclay) is a research laboratory that is a UMR from the Université Paris Saclay and the CNRS. A part of the researchers that participate to the RECA++ project are regrouped under the Altérations team and are recognized in the field of weathering, soils, mineralogy, geochemistry such as stable, metallic and helium isotopes, traces and rare earth elements and the dating of supergene minerals. The expertise in geochemistry is based on the analytical platform in isotopic mass spectrometry: clean lab, HR-ICPMS, rare gases mass spectrometry and mineralogy (DRX, SEM) and the use of synchrotron radiation.
The CEREGE (European Center for Research and Teaching in Environmental Geoscience) is a large UMR composed of The University of Aix-Marseille (AMU), CNRS, IRD, Collège de France and INRAE, specialized on geosciences of the environment. CEREGE belongs to the OSU-Institute PYTHEAS (Observatoire des Sciences de l’Univers) and participates to the scientific federation ECCOREV (CNRS-INEE). A large part of its research, regrouped under the team “Soils”, focusses on the evolution of soils and soil constituents under the pressure of climate and land use change. Members of the team “Soils” involved in this project have an internationally recognized expertise in application of non-traditional stable isotopes for addressing the questions of soil dynamics, pedological evolutions and isotope biogeochemistry. The expertise in geochemistry is based on a large analytical platform in isotopic mass spectrometry: clean lab, MC ICP MS Neptune +, 3 IRMS, 2 TIMS, ICPMS quadrupole, ICPAES, Tandem accelerator delivering a working terminal voltage of 5MV (the national facility ASTER).
The IMPMC (Institute of Mineralogy, Material Physics, and Cosmochemistry) is an UMR associated to Sorbonne University, the National Center for Scientific Research (CNRS), the National Museum of Natural History (MNHN), and the Research Institute for Development (IRD). As a multidisciplinary institute, it gathers physicists, biologists, mineralogists (about 200 persons) around the study of the structure of matter in the different scientific fields and at their interfaces. The members of the environmental mineralogy team work on natural and synthetic minerals, from the field to the lab. They have an internationally recognized expertise on the understanding and modelling of processes involving minerals in the biogeochemical cycles of elements at the Earth's surface: weathering, formation of soils, transport, sedimentation, diagenesis. One common approach is crystal or structural chemistry, which is used to trace the various processes. Their expertise relies on classical mineralogy tools (XRD, SEM...), a large spectroscopic platform (UV-Visible, Fourier transform infrared, Raman, Electron Paramagnetic Resonance) and on the regular access to synchrotron facilities (X-ray absorption spectroscopy...) in various countries.

IPG Paris, France
Institut de physique du globe de Paris (IPGP), is a leading institution in Earth Sciences at both the national and international levels ( It is now an integral part of the largest university in France, Université de Paris (UP). IPGP possesses the label of "Grand Établissement" and is officially in charge of the monitoring of the four active French volcanoes. IPGP hosts about 300 research permanent staff and about 350 scientists, including PhD students and post-docs. The IPGP team engaged in RECA is "Geochemistry of Outer Layers" (G2E, ~15 persons including PhD students) is one of the main scientific and organizational actors of the High-Resolution Analytical Platform PARI of IPGP, featuring among other facilities and instruments, 4 clean labs, 1 ICP-OES, 2 ICP-QMS, 1 HR-ICP-MS, 1 TOF-ICP-MS, 1 TIMS, and 3 MC-ICP-MS. G2E has a world-class expertise in river geochemistry and ranks amongst the first research groups at the international scale for the application of metal isotopes to weathering studies.

IJCLab, Orsay, France
The Laboratory of the Physics of the two infinities Irène Joliot-Curie (740 people), is the result from the merger of five laboratories (CSNSM, IMNC, IPNO, LAL and LPT) that were close to each other geographically (Orsay campus) and scientifically. This laboratory has the ability, the vocation and the ambition to make a global impact on a large range of scientific and technical topics by leading large-scale projects at the national and international levels.

BRGM, Orléans and French Guiana, France

BRGM is the French public establishment of reference in the application of Earth sciences to manage the resources and risks of the soil and subsoil. It is the French national geological survey. BRGM's activities cover several fields: scientific research, expertise, innovation and transfer, analysis and experimentation, mine prevention and safety, higher education, continuing professional education, dissemination of knowledge and open science. The BRGM has a known expertise on the Guyana shield evolution from the Paleoproterozoic geodynamics to the recent history of the area especially dealing with the weathering processes through paleomagnetic dating. They are well implanted in Guyana, with an office in Cayenne that will be the starting point for field trips in Guyana and Suriname.
TotalEnergies is a broad energy company that produces and markets fuels, natural gas and electricity. Our 100,000 employees are committed to better energy that is more affordable, more reliable, cleaner and accessible to as many people as possible. Active in more than 130 countries, our ambition is to become the responsible energy major. TotalEnergies has a long-term expertise in margins evolution including in Guyana/Suriname area. Their R&D department has developed a project on the relation between erosion and weathering and associated sedimentation in adjacent offshore basins. They also possess a robust competence in the geochemistry of weathered minerals. In addition, BRGM and TotalEnergies supports the "Source to Sink" project, with a section dedicated to the dating of laterites in Guyana and Suriname

GFZ, Potsdam, Germany

The GFZ German Research Centre for Geosciences is the national research centre for Earth sciences. Research at the GFZ focuses on the geosphere within the highly complex System Earth with its further subsystems, its interacting subcycles, and its wide network of cause-and-effect chains. This we do in a close interdisciplinary collaboration with the related scientific disciplines physics, mathematics, chemistry, and biology as well as with the engineering sciences disciplines of rock mechanics, engineering hydrology and seismology.

UnB, Brasilia, Brazil
The Instituto de Geociências (IG) laboratory is part of the University of Brazilia (Brazil) is public university located in Brasília, in the Federal District of Brazil. It was founded in 1962 by the anthropologist Darcy Ribeiro, who became its first rector, along with Heron de Alencar. It is one of the most famous universities in Latin America, especially in Political Science, Economics, Law, Anthropology and International Relations. The University of Brasília was considered by the General Curricula Index (generated by the Brazilian Ministry of Education) as the best university in the Central-Western region, and the fourth best in Brazil by the Quacquaralli Symonds. The Institute of Geosciences at UnB has laboratories in all subareas of the Geosciences, to which students have ample access. Almost all laboratories have state-of-the-art equipment, in order to adequately meet the teaching and research activities developed within the Institute, as well as the exchange with other universities, research institutions and companies in the country and abroad. The laboratories for lamination, sample preparation, heavy mineral separation, computing, microscopy, fluid inclusions, X-ray diffractometry, electron microprobe, geochemistry, stable isotopes, geochronology, micropaleontology, scanning electron microscopy, remote sensing and spatial analysis, applied geophysics, and laboratories for the Seismological Observatory and for lithosphere studies are fully operational. The IG laboratory possesses recognized expertise in Brazilian weathering profiles including their elemental and isotopic geochemistry.

LABOGEF, University federal de Goias, Brazil

The LABOGEF laboratory is part of a Brazilian federal university located mainly in Goiânia, capital of the state of Goiás. It is recognized as one of the best universities in Brazil, especially in the areas of ecology, biotechnology and journalism, which are national references. The Laboratory of Geomorphology, Pedology and Physical Geography of the Institute for Socio-Environmental Studies at UFG was created in 1998 and is essentially aimed at research, undergraduate and graduate teaching and extension in the areas of Geography, Geology, Geomorphology, Pedology, Geoecology, Water Resources and Environmental Sciences. Its main focus is on studies related to the origin, evolution, and causes of environmental impacts on soils, relief, water resources, coverage, and biota. It also provides services to meet the demands of federal, state, and municipal government departments and agencies, as well as to the actions of the Public Prosecution Service, especially the state one. For the purpose of the project, the LABOGEF laboratory manufactures remote sensing and GIS tools, which will facilitate the definition of the exact sampling sites based on geomorphological criteria.