Conference Proceedings
Retrieving past geodynamic events by unlocking rock archives with μ-XRF and μ-spectroscopy
V De Andrade, J Ganne, B Dubacq, CG Ryan, F Bourdelle, A Plunder, G Falkenberg, J Thieme
Journal of Physics Conference Series | IOP PUBLISHING LTD | Published : 2014
Abstract
Rocks are commonly polycrystalline systems presenting multi-scale chemical and structural heterogeneities inherited from crystallization processes or successive metamorphic events. This work illustrates how spatially resolved analytical techniques coupled with thermodynamic approaches allow rock compositional variations to be related to large-scale geodynamic processes. Emphasis is placed on the contribution of quantitative chemical imaging to the study of 2.2-2.0 Gy old metamorphic rocks from the West African Craton. A thorough analysis of elemental chemical maps acquired on rock thin sections enabled high pressure relic minerals to be located and re-analyzed later with precise point analys..
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Funding Acknowledgements
This work was financially supported by the NSLS-II project, itself funded by the US department of Energy, Office of Science and Office of Basic Energy Sciences. We are grateful to Ulrike Boesenberg and Gerd Wellenreuther from the P06 beamline team at Petra III, who helped setting up the experiment aiming to test the new Maia 384 detector. We also want to thank Robin Kirkham & Pete Siddons for their support and advices concerning the Maia. At last, thanks to Tom Schoonjans for his support in configuring the XMIMSIM software and the SRX team endeavoring to build an outstanding instrument.