It is essential that any Tephra analysis from any EPMA laboratory is presented together with a recognised standard and the analytical conditions.
The EPMA Facility at Edinburgh has numerous standards for verification of data quality during analyses. The most commonly used during analysis of tephras are BCR2g for basaltic compositions, and Lipari for rhyolitic compositions.
Clients occasionally bring their own standards, and these are run together with the Edinburgh standards.
The accepted values for the BCR2g and Lipari standards are:
This article was published on 25 May, 2020