| Sample Number | 07MBW835A |
|---|---|
| Project | Alaska highway, gas pipeline, and infrastructure corridors |
| Reference Number | FA07107977 |
|---|---|
| Reference Date | 2007-11-07 |
| Citation | RDF 2008-2 v. 1.0.1 |
| Laboratory | ALS Chemex |
| Description | Rock samples were crushed with a Terminator jaw crusher with chrome steel alloy plates so that at least 70 percent of the material passed through a -10 (2 mm) mesh screen. Representative aliquots of 250 grams and 30 grams each were taken using a stainless steel riffle splitter. These samples were then pulverized in a chrome steel ring mill so that 85 percent of the sample passed through a -200 (75 micron) mesh screen. Most trace-element analyses were performed on the 250 gram split while gold analyses were performed on the 30 gram representative split. 34 samples were analyzed for major and minor oxides using X-ray fluorescence spectrometry following a lithium metaborate fusion. Analysis of trace elements (Nb, Rb, Sr, Y, and Zr) were performed using wavelength-dispersive X-ray fluorescence spectrometry on pressed pellets. |
| Sample Type | rock |
| Reference Number | RDF2008-2_UAFTE |
|---|---|
| Reference Date | 2007-04-01 |
| Citation | RDF 2008-2 v. 1.0.1 |
| Laboratory | University of Alaska, Fairbanks - Newberry, Rainer J. |
| Description | Samples were were crushed and pulverized to provide a 10 gram pelletized sample. The trace element analyses were conducted using wavelength-dispersive X-ray fluorescence spectrometry on pressed pellets using standard Norrish and Hutton (1969) procedures as described in Potts (1987) and as used by Cameron (2000). Well-calibrated international standards were used as a check of the analyses. The routine was customized for inter-elemental X-ray interferences in rocks of basaltic and felsic compositions. By comparing results on well-characterized rock standards, DGGS found in 2006 that the UAF routines yield more accurate trace-element results and in 2007 we chose to perform the Nb, Rb, Sr, Y, and Zr analyses using this procedure. |
| Sample Type | rock |