IG9/GMPV2.2/PS9.2New advances in non-traditional isotope chemistry, thermochronometry and 40Ar/39Ar dating (co-organized)
|Convener: R. Brown | Co-Conveners: F. Jourdan , A. Carter , F. Stuart|
/ Thu, 26 Apr, 08:30–12:00 / Room 42
/ Attendance Thu, 26 Apr, 17:30–19:00 / Hall A
This session consist of three sections:
- Recent advances in non-traditional stable isotope geochemistry:
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.
- Thermochronometry: new advances in theory, applications and methodologies:
Geochronology, the science of dating rocks and determining the time sequence of events in the history of the Earth, underpins modern, quantitative geoscience. Thermochronometry extends this science by determining the temperature a rock sample experienced at a particular time, or times, in the past, i.e. the rock's thermal history and enables us to study and quantify a whole range of processes that are important to understanding how the Earth evolved. Examples include quantifying the tempo of formation and destruction of the Earth's surface topography that is strongly regulated by erosional processes, the mass and chemical exchange between continents and oceans and the consequent recycling of crustal materials into the mantle and in geological processes controlling the long-term CO2 levels within the atmosphere. Quantifying the timing, amount, rates and spatial patterns of major thermal and/or erosional events is therefore crucial to developing a full, quantitative understanding of how the Earth works. Such information is routinely obtained from thermochonometry, principally 40Ar-39Ar, apatite (U-Th)/He (AHe) and fission-track (AFT) . The fidelity and scope of these methods continues to grow through improved modelling techniques and combination with geochronometers such as U-Pb and Sm-Nd. This session invites studies that review and discuss the current state-of-the-art of thermochronometry techniques, present new and innovative applications and discuss advances in theory and approaches to deriving thermal histories and quantification of erosion.
|Public information:||This session is co-sponsored by the European Association of Geochemistry (EAG).|