U.S. Geological Survey Certificate of Analysis

Syenite STM-1

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
Fe2O3T 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

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Certificate Information

Denver, Colorado
revised March 1995

David B. Smith
Central Region Mineral Resources Team (formerly Branch of Geochemistry)

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Glossary

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

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Notes

Unless otherwise indicated, total element concentrations are reported for material on an as-received basis, i.e., no drying.

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Order and Pricing Information

This geochemical reference standard is no longer available.

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