State of Alaska Alaska | Natural Resources DNR | Geological & Geophysical Surveys DGGS | Geochemistry Geochem

Sample Detail

Sample Number 08JEA014C
Project East Bonnifield

Sample Documentation

Analyses [Download All]

Reference Number rdf2016-6-slab-xrf
Reference Date 2008-11-01
Citation RDF 2016-6 v. 1.1
Laboratory Advanced Instrumentation Laboratory at the University of Alaska Fairbanks - Newberry, R.J.
Description Rocks were cut using a diamond-blade tile saw; foliated and lineated rocks were cut so that the analyzed surface is at right angles to the rock fabric. Surfaces for analysis were lightly polished with a lapidary wheel to provide a smooth surface to minimize X-ray scatter. X-ray florescence (XRF) spectroscopic analyses were performed at UAF using a PANalytical Axios spectrometer under vacuum. The measurements were standardized using well-characterized, natural, fine-grained rock and pure mineral standards as well as conventional pressed pellets of international rock standards. Because no volatile components were measured and rocks were of varying porosities, the analyses were normalized to 100 percent totals. In the vast majority of cases the original analyses yielded totals of approximately 95 to 102 weight percent. Comparison between these analyses and those produced on the same rocks by conventional pressed pellet (for trace elements) and fused disk (for major and minor oxides) techniques indicates that major- and minor-oxide and trace-element concentrations are most likely within 10 percent of the 'true' concentrations.
Sample Type rock