************************************************************ From: Barbara L Dutrow <dutrow@xxxxxxx> ************************************************************ Colleagues: Our apologies for the multiple postings. Please consider submitting a presentation to the Fall AGU session: -------------------------------------------------------------------------------------- V05: Recent Advances in Lithium Isotope Geochemistry -------------------------------------------------------------------------------------- Abstract deadline is Sept. 10, 2008. There has been much effort expended over the past twenty years, after the pioneering work of Dr. Lui-Hueng Chan, in the development of precise and accurate measurements of lithium isotopes in terrestrial and extra-terrestrial materials. As a consequence, our understanding of lithium isotope systematics has been greatly improved and gives rise to important new perspectives on a range of natural processes. It is now known that lithium isotopes can be significantly fractionated not only at low-temperatures, by fluid-rock interactions but also during high-temperature processes, associated with the anomalously high rate of lithium diffusion. Nonetheless, compared with other stable isotope systematics, many fundamental problems concerning Li isotopes are still not resolved. For example, the behavior of lithium isotopes during prograde metamorphism is debated; the lithium isotopic dataset on extraterrestrial materials is still very limited; experimentally calibrated equilibrium lithium isotope fractionation factors are rare; lithium diffusivity and the scale of lithium isotope fractionation by diffusion in solid phases are still not well-known. The promising application of Li isotopes to exploring large scale problems, such as tracking changes in continental weathering rates and the return of crustal material to the mantle are limited by some of these uncertainties. In this session, we welcome contributions that deal with lithium isotopes using analytical, experimental or theoretical approaches to address different processes including but not limited to low-temperature fluid-rock interactions, high-temperature diffusion, metamorphism of terrestrial and extraterrestrial materials, and continental and oceanic magmatism. If you have any questions, please contact one of the organizers. Barb Dutrow, for the organizers: Fang-Zhen Teng Department of Geosciences & Arkansas Center for Space and Planetary Sciences, University of Arkansas fteng@xxxxxxxx Tim Elliott Department of Earth Sciences, University of Bristol tim.elliott@xxxxxxxxxxxxx Barbara L. Dutrow Department of Geology & Geophysics, Louisiana State University dutrow@xxxxxxx Joris M. Gieskes Scripps Institution of Oceanography, UCSD jgieskes@xxxxxxxx ============================================================== To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxxx To contribute to the volcano list, send your message to: volcano@xxxxxxxx Please do not send attachments. ==============================================================
