A spreadsheet for calculating normative mole fractions of end-member species for Na-Ca-Li-Fe2+-Mg-Al tourmalines from electron microprobe data

2016 ◽  
Vol 101 (1) ◽  
pp. 111-119 ◽  
Author(s):  
George B. Morgan
Keyword(s):  
Electron Microprobe ◽  
Microprobe Data

Bence-albee after 25 years: A new superior α-factor correction procedure for the quantitative analysis of oxides and silicates

1992 ◽  
Vol 50 (2) ◽  
pp. 1744-1745
Author(s):  
John T. Armstrong
Keyword(s):  
Quantitative Analysis ◽  
Electron Microprobe ◽  
Binary Systems ◽  
Correction Procedure ◽  
Geological Samples ◽  
The Past ◽  
Large Matrix ◽  
Computational Speed ◽  
Microprobe Data ◽  
Geological Sciences

One of the most cited papers in the geological sciences has been that of Albee and Bence on the use of empirical " α -factors" to correct quantitative electron microprobe data. During the past 25 years this method has remained the most commonly used correction for geological samples, despite the facts that few investigators have actually determined empirical α-factors, but instead employ tables of calculated α-factors using one of the conventional "ZAF" correction programs; a number of investigators have shown that the assumption that an α-factor is constant in binary systems where there are large matrix corrections is incorrect (e.g, 2-3); and the procedure’s desirability in terms of program size and computational speed is much less important today because of developments in computing capabilities. The question thus exists whether it is time to honorably retire the Bence-Albee procedure and turn to more modern, robust correction methods. This paper proposes that, although it is perhaps time to retire the original Bence-Albee procedure, it should be replaced by a similar method based on compositiondependent polynomial α-factor expressions.

Oscilloscope Readout of Electron Microprobe Data

1962 ◽  
Vol 6 ◽  
pp. 291-300
Author(s):  
Kurt F. J. Heinrich
Keyword(s):  
Electron Microprobe ◽  
Electron Probe ◽  
Practical Importance ◽  
Data Presentation ◽  
Great Practical Importance ◽  
Microprobe Data ◽  
Scanning Electron

AbstractIn view of the amount of data per time unit the scanning electron probe is capable of producing, time economy in data presentation is of great practical importance. In this paper, the characteristics and advantages of various previously known techniques of data presentation are described, and some novel procedures are proposed.

Electron Microprobe Data for Tephra Attributed to Glacier Peak, Washington

1977 ◽  
Vol 7 (2) ◽  
pp. 197-206 ◽  
Author(s):  
Henry W. Smith ◽  
Rose Okazaki ◽  
Charles R. Knowles
Keyword(s):  
Electron Microprobe ◽  
Tephra Layers ◽  
Microprobe Data ◽  
Eastern Washington ◽  
Reference Samples ◽  
Mount St Helens ◽  
Glass Shards

Reference samples of three prominent pumice units of Glacier Peak tephra collected east of the volcano within a distance of 100 km are similar petrographically to units described by earlier workers. Glass shards isolated from these samples were analyzed by electron microprobe to determine the content of Ca, Fe, and K. Resulting data, plus those published for two other references samples, provide a basis for attributing certain outlying tephra layers from 14 locations in eastern Washington, Idaho, Wyoming, and Montana to eruptions of Glacier Peak. Ten of the samples have properties of both Glacier Peak tephra and Mount St. Helens set J tephra, but proportions of Ca:Fe:K in glass shards indicate that 9 of the 10 outlying samples came from Glacier Peak, whereas one is assigned to Mount St. Helens set J. The remaining six outlying samples, all from southeastern Washington, contain cummingtonite phenocrysts and are chemically similar to some parts of Mount St. Helens tephra sets that are older than 12,000 BP.

Element Partitioning in a Pyrochlore-Based Ceramic Nuclear Waste form

2002 ◽  
Vol 713 ◽  
Author(s):  
R. Gieré ◽  
C. Hatcher ◽  
E. Reusser ◽  
E. C. Buck
Keyword(s):  
Nuclear Waste ◽  
Electron Microprobe ◽  
Waste Form ◽  
Element Partitioning ◽  
The Future ◽  
Coupled Substitution ◽  
Major Oxide ◽  
Microprobe Data ◽  
A Site ◽  
Structural Site

ABSTRACTPyrochlore-rich ceramics containing additional zirconolite, brannerite and rutile have been developed for immobilizing excess weapons plutonium. This study reports data for a ceramic containing small amounts of Al and Mo in addition to the major oxide components of Ti, U, Ca, Hf, Gd and Ce. Hafnium and Gd are added as neutron absorbers, Al and Mo represent impurities. Quantitative electron microprobe data demonstrate that UO2 is strongly partitioned into brannerite (45 wt%), which is present as euhedral crystals with inclusions of unreacted UO2. Pyrochlore forms the groundmass and has an average UO2 content of 28 wt%. Zirconolite contains only 15 wt% UO2, but is significantly more effective in accommodating Hf and Gd than both brannerite and pyrochlore. Zirconolite incorporates U together with Hf and Ce in one structural site, whereas brannerite and pyrochlore accommodate U with Gd in a site that is distinct from that occupied by Hf. Incorporation of Gd into zirconolite takes place via a coupled substitution involving Al, thus explaining the high Al2O3 contents (3 wt%). Molybdenum was not detected in the major oxides, and it might be present in the accessory rutile. Although the studied waste form was designed to incorporate Pu, the present dataset is also valuable because immobilization of highly fissile U (e.g., U-233) might need to be considered in the future.

scholarly journals Supplemental Material: Water in omphacite fingerprints the thermal history of eclogites

2021 ◽  
Author(s):  
Peilin Jiang ◽  
Xiaozhi Yang ◽  
et al.
Keyword(s):  
Fourier Transform ◽  
Raman Spectra ◽  
Electron Microprobe ◽  
Thermal History ◽  
Fourier Transform Infrared ◽  
Infrared And Raman Spectra ◽  
History Of ◽  
Microprobe Data

Fourier transform infrared and Raman spectra, electron microprobe data, and resolved band absorbance ratios of samples.<br>

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