HR: 0800h
AN: V41E-1510    [Abstracts]
TI: Chemical Imaging With NanoSIMS: A Window into Deep-Earth Geochemical Processes
AU: * Badro, J
EM: badro@ipgp.jussieu.fr
AF: Institut de Physique du Globe de Paris, IMPMC Batiment 7, 140 rue de Lourmel, Paris, 75015 France
AU: * Badro, J
EM: badro@ipgp.jussieu.fr
AF: Lawrence Livermore National Laboratory, University of California, 7000 East avenue, Livermore, 94550 United States
AU: Weber, P
EM: weber31@llnl.gov
AF: Lawrence Livermore National Laboratory, University of California, 7000 East avenue, Livermore, 94550 United States
AU: Ricolleau, A
EM: aricolle@lmcp.jussieu.fr
AF: Institut de Physique du Globe de Paris, IMPMC Batiment 7, 140 rue de Lourmel, Paris, 75015 France
AU: Fallon, S
EM: fallon4@llnl.gov
AF: Lawrence Livermore National Laboratory, University of California, 7000 East avenue, Livermore, 94550 United States
AU: Ryerson, F
EM: ryerson1@llnl.gov
AF: Lawrence Livermore National Laboratory, University of California, 7000 East avenue, Livermore, 94550 United States
AU: Hutcheon, I
EM: hutcheon1@llnl.gov
AF: Lawrence Livermore National Laboratory, University of California, 7000 East avenue, Livermore, 94550 United States
AU: AlbarŠde, F
EM: albarede@ens-lyon.fr
AF: Ecole Normale Sup‚rieure de Lyon, Laboratoire de Sciences de la Terre, 46 all‚e d'Italie, Lyon, 69007 France
AB: We use the new nanometer-resolution secondary ion mass spectrometry (NanoSIMS) technique for chemical imaging of material transformed in a laser-heated diamond anvil cell, at lower mantle pressures and temperatures. This type of measurement opens new pathways towards the characterization and quantification of geochemical interactions and processes occurring in the deep Earth. The sample consists of transformed MORB (mid-ocean ridge basalt), one of the components of subducted oceanic lithosphere. It was used to show that even the most complex mineral assemblages can be probed using this new technique. Elemental imaging spans the entire range of concentrations, from major elements such as silicon (49.5 wt% SiO₂), to minor elements such as titanium (1.8 wt% TiO₂), to trace elements such as strontium (118 ppm), scandium, and yttrium (both at 40 ppm). We observe a preferential partitioning of scandium, yttrium and strontium in the calcium silicate perovskite phase, and we compare this to recently published solid-liquid partition coefficients at lower pressures.
DE: 1009 Geochemical modeling (3610, 8410)
DE: 1012 Reactions and phase equilibria (3612, 8412)
DE: 1025 Composition of the mantle
DE: 1065 Major and trace element geochemistry
DE: 3924 High-pressure behavior
SC: Volcanology, Geochemistry, Petrology [V]
MN: Fall Meeting 2005