Electron microprobe determination of minor and trace transition elements in silicate minerals: A method and its application to mineral zoning in the peridotite nodule PHN 1611

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Output type: Journal article

UM6P affiliated Publication?: No

Author list: Merlet C., Bodinier J.

Publisher: Elsevier

Publication year: 1990

Journal: Chemical Geology (0009-2541)

Volume number: 83

Issue number: 1-2

Start page: 55

End page: 69

Number of pages: 15

ISSN: 0009-2541

URL: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0025682421&origin=inward

Languages: English (EN-GB)

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We present a WDS analytical technique for the determination by electron microprobe of low concentrations of the transition elements Sc, Ti, V, Cr, Mn, Co and Ni in ferro-magnesian silicate minerals. The quality of measurements is improved by: 1. (1) Optimization of counting times, taking into account the anticipated analytical precision. 2. (2) Monitoring instrumental and sample stabilities, by a statistical analysis of peak and background intensity values sampled at intervals of 1 s. Simultaneous measurement of major elements is essential in evaluating bias related to instrumental drift. 3. (3) Precise determination of background, achieved by a least-squares fitting of the measured background to a calculated one. The latter is calculated by using a modified form of the Kramer's equation. This approach is also effective in correcting peak overlap interferences. The efficiency of this method was checked by performing core-to-rim analysis of garnet, clinopyroxene and orthopyroxene prophyroclasts in the peridotite nodule PHN 1611. This led to precise determination of trace-element chemical zoning in these minerals. © 1990.


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