This session includes two blocks of special interest:

- New analytical methods and experimental approach in isotope geochemistry Many of the recent advances in biogeosciences have been stimulated by new or improved analytical instrumentation and development of novel methods and experimental approaches for isotopic analysis. This session encourages submissions related to isotopic analysis of non-traditional stable isotope (e.g. Mg, Si, Fe, Cu, Zn) and radiogenic isotope (e.g. Sr, Nd, Os, Pb). According to the applications, either high precision or high throughput might be the answer to given scientific questions. In other cases, space resolution or molecular analyses are needed. All contributions on advances in isotopic measurements using Multicollector ICP-MS, high resolution ICP-MS, SIMS, nanoSIMS and TIMS will be welcome. We particularly seek contributions involving novel instrumental techniques (e.g. laser ablation, hyphenated techniques) permitting high sensitivity and high spatial resolution analysis as well as compound specific isotope analysis. Contribution on dedicated reference materials are also encouraged.

- 40Ar/39Ar dating: from geochronology to thermochronology, from archaeology to planetary sciences.
The 40Ar/39Ar dating technique is increasingly becoming one of the most trusted dating techniques in the geological community. The 40Ar/39Ar method has been in use since more than 40 years, and has been in constant evolution since then. The steady improvement of the technique is largely due to a better understanding of the K/Ar system (e.g. alteration effects) along with a continuous refinement of the method (e.g. measurement techniques, constants, interpretations). The 40Ar/39Ar method is also one of the most versatile techniques with countless applications in archaeology, tectonics, structural geology, orogeny and provenance studies, ore and petroleum genesis, volcanology, weathering processes and climate, and planetary sciences.
In this session, we welcome all range of contributions about 40Ar/39Ar dating at large with emphasis on methodological developments with original ideas or new concepts, modeling and data handling, and direct applications of the 40Ar/39Ar technique.