DTTG Workshop (Greifswald, 22.-28.02.2019)

The 8th international DTTG workshop on “Qualitative and quantitative analysis of clays and clay minerals” focuses on the needs of graduate students in the field of clay science. Content of the workshop will include topical lectures on theory as well as practical laboratory exercises. Clay scientists from Germany and Switzerland will cover the most important analytical tools needed to study clay minerals. This year one of the days is focused solely on electron microscopy and one day on Rietveld modeling of XRD patterns. The other days will cover a number of other methods/topics such as FTIR, CEC, STA, chemistry of clay minerals, stable and radiogenic isotopes, and pore investigations.

Organizers: Georg Grathoff and Laurence Warr

EGU Konferenz (Wien, 7.-12.04.2019)

Session SSS3.7: Pedogenic processes of soils and palaeosols across scales - influence of various factors, including imprints of human activities 

Soil-forming processes can be observed at various spatial and temporal scales, including molecular - microscopic - pedon - landscape scales, and a similarly wide range of temporal scales. They are influenced not only by the “classical five” soil-forming factors, but also by the factor “humans”. This holds true not only for the industrial period and urbanized areas, but also for paleopedological and archaeological contexts. In this session, we seek abstracts on all of these aspects of “soils as records in time and space”:
- soil processes proceeding at different scales, incl. interactions across scales (both spatial and temporal)
- human-induced soil changes (incl. mechanical and chemical changes, as well as the introduction of artificial parent materials)
- advances in understanding weathering mechanisms and mineralogical changes in time and space
- linkages of spatial patterns and processes in soil landscapes over time
- processes taking place on short time scales, thereby contributing to long-term soil changes
- aeolian inputs to soils, implications for soil genesis and ecologically relevant soil properties
- palaeosols and geomorphic features as records of former environments and human activity

Conveners: Daniela Sauer, Joscha Becker, Markus Egli, Klaus Kaiser, Anna Schneider

Session SSS5.14: Soil minerals and the cycling of elements with special focus on carbon

Soil is an environment where minerals undergo steady changes with consequences to the bioavailability and cycling of elements. Chemical weathering of primary minerals provides nutrients to soil biota and results in the formation of secondary minerals that react strongly with pollutants, organic matter, and organisms. Soil minerals, therefore, are major controls in the biogeochemical cycling of elements in soil. The complex interactions between minerals and their abiotic and biotic environment offer numerous challenges to modern environmental research, such as (1) the identification of relevant mineral-related processes at different spatial and temporal scales, (2) the determination of properties of soil minerals, and (3) the resulting impact of soil minerals on element speciation, mobility, and bioavailability. The session aims at bringing together expertise in field, laboratory, and modelling studies for shedding light on all aspects of soil minerals as determinants in the biogeochemical cycling of major (e.g., carbon, nitrogen, phosphorus, and sulphur) and trace elements (e.g., antimony, cadmium, molybdenum, and selenium).

Conveners: Robert Mikutta, Christian Mikutta, César Plaza, Claudio Zaccone

Goldschmidt Konferenz (Barcelona, 18.-23.08.2019)

Session 12e: Coupling Fe, Mn, and S transformation with contaminant and nutrient cycles

Biogeochemical processes at aqueous-solid interfaces drive nutrient and contaminant cycles and mobility in important terrestrial environments, such as the capillary fringe, hyporheic zones, wetland/mangroves, floodplains, and groundwater aquifers. The high spatial and temporal heterogeneities in these environments can influence dissolution/precipitation and complexation reactions, reactive intermediates, and interrelations of organics, minerals, and trace nutrients and contaminants. In this session, we aim to highlight the importance of coupled redox transformations and temporal and spatial complexity in field and laboratory experiments. This will improve our understanding of nutrient (P, N) and redox-sensitive metal(loid) (e.g. As, Fe, Mn, U) behaviors in the environment that have major impacts on groundwater and surface water quality. Fe, Mn, and S in particular serve as excellent tracer for system dynamics that can help elucidate trace element behavior. With increasing availability of new and more sophisticated techniques, it is now possible to decipher the interactions between elements during redox transformations at molecular and atomic levels, offering unprecedented resolution of regulating mechanisms behind nutrient and contaminant behavior even in highly heterogeneous redox environments. We encourage contribution covering field, controlled laboratory, and theoretical studies on redox driven nutrient and contaminant mobility. We are particularly interested in studies focusing on impactful (but challenging to study) and complex interface environments. We welcome studies utilizing novel approaches and analytical techniques to elucidate controls on mineral dissolution and transformation, climate change induced redox transitions, redox dynamics through wet-dry cycles, and coupled Fe, Mn, S, and metal(loid) contaminant cycles in heterogeneous redox situations.

Conveners: Naresh Kumar, Jagannath Biswakarma, Kristin Boye, Christian Mikutta

DBG Jahrestagung (Bern, 24.-29.08.2019)

Symposium: Bodenminerale und Verwitterung als Steuergrößen biogeochemischer Elementkreisläufe

Chemische Verwitterung primärer sowie die Bildung sekundärer Minerale beeinflussen biogeochemische Elementkreisläufe. Chemische Verwitterung und Mineralneubildung in Böden sind ihrerseits an hydrologische und biologische Prozesse gekoppelt. Diese Komplexität bedingt zahlreiche Wissensdefizite bezüglich (1) der Mechanismen der Mineralverwitterung, (2) ihre Abhängigkeit von und Rückkopplung mit Klima und Lebewelt sowie (3) ihr Einfluss auf Speziierung, Mobilität und Bioverfügbarkeit von Haupt- und Spurenelementen. In unserem Symposium möchten wir Feld-, Labor- und Modellierungsstudien zur Mineralverwitterung und -neubildung sowie dem Einfluss von Bodenmineralen auf den Umsatz von Haupt- (z.B. Kohlenstoff, Stickstoff, Phosphor, Schwefel) und Spurenelementen (z.B. Antimon, Kadmium, Molybdän, Selen) in Böden vorstellen.