Major-element ratios in synthetic fluid inclusions by synchrotron X-ray fluorescence microprobe
نویسنده
چکیده
Individual fluid inclusions in quartz were investigated by synchrotron radiation X-ray fluorescence (SXRF) microprobe to develop protocols for major-element microanalysis. Studies were conducted of synthetic fluid inclusions in Brazilian quartz that contain fluids of known NaC1-CaC12-H20 and KCI-H20 compositions. Inclusions were irradiated by synchrotron X-rays and the resulting energy-dispersive spectra were corrected for fluorescence yield and absorption effects to obtain Ca/C1 and K/C1 ratios. Results are commonly better than + 30% relative to the nominal ratio. Element ratios obtained by SXRF may be combined with results of heating and freezing studies to characterize non-destructively the bulk major-element composition of individual inclusions. Extension of the analytical protocol to elements of higher atomic number (e.g., trace and transition elements) will result in better precision as absorption effects and peak overlaps become less problematic.
منابع مشابه
FIRST Ti-XANES ANALYSES OF REFRACTORY INCLUSIONS FROM MURCHISON
Introduction: A system of solar composition is so reducing that Ti and Ti can coexist, making the valence of Ti a valuable indicator of fO2 conditions during formation of nebular materials. The Ti/Ti ratios observed in the Ti-rich phases fassaite and rhönite in coarse-grained refractory inclusions from CV3 chondrites have been shown [1,2] to be quantitatively consistent with formation in a gas ...
متن کاملInterpretation of heterogeneity effects in synchrotron X-ray fluorescence microprobe data
Heterogeneity effects often limit the accuracy of synchrotron X-ray fluorescence microprobe elemental analysis data to ¡30%. The difference in matrix mass absorption at Ka and Kb fluorescence energies of a particular element can be exploited to yield information on the average depth-position of the element or account for heterogeneity effects. Using this technique, the heterogeneous distributio...
متن کاملSynchrotron X-ray Fluorescence Analysis of Dust Particles
Introduction: Synchrotron x-ray fluorescence (SXRF) studies carried out on a microprobe endstation allow non-destructive analysis of both major and trace element abundances in particles only microns in size. The technique has been applied to IDPs captured in the stratosphere to study atmospheric entry effects such as stratospheric contamination and frictional heating [1, 2]. SXRF will also be a...
متن کاملSynchrotron-based Spectroscopic Studies of Metal Species in Solid Phases: the Case of Arsenic
The production of high-energy (1 KeV to 40 KeV) x-radiation at synchrotron laboratories around the world has enabled the spectroscopic analysis of core level electronic transitions and electronic scattering processes in trace (< 1000 ppm) metal and metalloid atoms as they are found in heterogeneous natural materials (e.g., soils, sediments, plants, and microbial mats). Environmental geochemists...
متن کاملMirror-based X-ray Fluorescence Microprobes at the Advanced Photon Source and the National Synchrotron Light Source
High-energy synchrotrons are valuable sources of highly collimated, intense X-ray radiation for use in X-ray microprobe analysis including trace element quantification (X-ray fluorescence), chemical speciation determinations (X-ray absorption fine structure spectroscopy) and phase identification (X-ray diffraction). Kirkpatrick-Baez mirrors are being increasingly utilized for production of X-ra...
متن کامل