U.S. Geological Survey Geochemical Reference Materials and Certificates
U.S. Geological Survey
Certificate of Analysis
A sample of peralkaline nepheline syenite was collected from a sill that underlies Table Mountain which is approximately 60 km WNW of Eugene, Oregon. The rock sample was light to medium gray and had a glassy luster. The material was holocrystalline and very fine to fine grained, having a very pronounced trachytic texture (Flanagan, 1976).
Element concentrations were determined by cooperating laboratories using a variety of analytical methods. Certificate values are based primarily on international data compilations (Abbey, 1983; Gladney and Roelandts, 1988; Govindaraju, 1994). Initial USGS studies (Flanagan, 1976) provide background information on this material.
Recommended Values | Certificate Information | Glossary | Notes
| Oxide | Wt % | ± | Oxide | Wt % | ± | |
|---|---|---|---|---|---|---|
| SiO2 | 59.6 | 0.49 | CaO | 1.09 | 0.06 | |
| Al2O3 | 18.4 | 0.23 | MgO | 0.10 | 0.02 | |
| Fe2O3 | 2.87 | 0.02 | Na2O | 8.94 | 0.20 | |
| FeO | 2.09 | 0.03 | K2O | 4.28 | 0.07 | |
| Fe2O3 T | 5.22 | 0.1 | P2O5 | 0.16 | 0.01 | |
| TiO2 | 0.14 | 0.01 | ||||
| Element | µg/g | ± | Element | µg/g | ± | Element | µg/g | ± | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Ba | 560 | 60 | Gd | 9.5 | 0.8 | Sm | 13 | 1 | ||
| Be | 9.6 | 0.6 | Hf | 28 | 2 | Sr | 700 | 30 | ||
| Ce | 260 | 18 | La | 150 | 6 | Ta | 19 | 1.2 | ||
| Cl | 460 | 40 | Mn | 1700 | 120 | Tb | 1.6 | 0.2 | ||
| Cs | 1.5 | 0.1 | Nb | 270 | 12 | Th | 31 | 3 | ||
| Dy | 8.1 | 0.5 | Nd | 79 | 7 | U | 9.1 | 0.1 | ||
| Er | 4.2 | 0.4 | Pb | 18 | 1.8 | Y | 46 | 5 | ||
| Eu | 3.6 | 0.3 | Rb | 118 | 6 | Yb | 4.4 | 0.4 | ||
| F | 910 | 50 | Sb | 1.7 | 0.2 | Zn | 235 | 22 | ||
| Ga | 35 | 5 | Sc | 0.61 | 0.07 | Zr | 1210 | 120 |
| Element | µg/g | Element | µg/g | Element | µg/g | ||
|---|---|---|---|---|---|---|---|
| Ag | 0.08 | Co | 0.9 | Ni | 3 | ||
| As | 4.6 | Cr | 4.3 | Stot | 43 | ||
| B | 6.4 | Cu | 4.6 | Sn | 6.8 | ||
| Bi | 0.13 | Li | 32 | Tm | 0.7 | ||
| Cd | 0.27 | Mo | 5.2 | V | 8.7 |
Denver, Colorado
revised March 1995
David B. Smith
Central Region Mineral Resources Team (formerly Branch of Geochemistry)
| Symbol | Definition |
|---|---|
| Fe2O3T | Total iron expressed as Fe2O3 |
| Stot | Total concentration of sulfur |
| Wt % | Percent of total element concentration |
| µg/g | Total element concentration expressed as micrograms of element per gram of solid sample |
| ± | One standard deviation |
Unless otherwise indicated, total element concentrations are reported for material on an as-received basis, i.e., no drying.
This geochemical reference standard is no longer available.
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U.S. Geological Survey
URL: http://minerals.cr.usgs.gov/geo_chem_stand/syenitestm1.html
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