U.S. Geological Survey Geochemical Reference Materials and Certificates
PRELIMINARY
U.S. Geological Survey
Certificate of Analysis
Material used in the preparation of GSP-2 was collected by the U.S. Geological Survey, from the Silver Plume Quarry, which is located approximately 800 meters west of Silver Plume, Colorado. This is same location used to provide material for GSP-1. GSP-2 is a medium grained hypidiomophic- granular rock consisting essentially of quartz , plagioclase, microcline, biotite, and muscovite. Details of the collection, preparation, and testing are available (Wilson, S.A., 1998).
Element concentrations were determined in a round robin study involving 20 international laboratories. Recommended values are listed when analytical results provided by three independent laboratories using a minimum of three independent analytical procedures are in statistical agreement. Information values with standard deviations are listed when at least four independent laboratories using two independent analytical procedures have provided information. Information values without standard deviations represent information from a single laboratory or analytical procedure.
Recommended Values | Information Values | Certificate Information | Bibliography | Glossary | Order and Pricing Information
| Element | Wt % | ± | Oxide | Wt % | ± | |
|---|---|---|---|---|---|---|
| Al | 7.88 | 0.11 | Al2O3 | 14.9 | 0.2 | |
| Ca | 1.50 | 0.04 | CaO | 2.10 | 0.06 | |
| Fetot | 3.43 | 0.11 | Fe2O3 tot | 4.90 | 0.16 | |
| K | 4.48 | 0.12 | K2O | 5.38 | 0.14 | |
| Mg | 0.58 | 0.02 | MgO | 0.96 | 0.03 | |
| Na | 2.06 | 0.07 | Na2O | 2.78 | 0.09 | |
| P | 0.13 | 0.01 | P2O5 | 0.29 | 0.02 | |
| Si | 31.1 | 0.4 | SiO2 | 66.6 | 0.8 | |
| Ti | 0.40 | 0.01 | TiO2 | 0.66 | 0.02 |
| Element | µg/g | ± | Element | µg/g | ± | |
|---|---|---|---|---|---|---|
| Ba | 1340 | 44 | Pb | 42 | 3 | |
| Ce | 410 | 30 | Rb | 245 | 7 | |
| Co | 7.3 | 0.8 | Sc | 6.3 | 0.7 | |
| Cr | 20 | 6 | Sm | 27 | 1 | |
| Cu | 43 | 4 | Sr | 240 | 10 | |
| Eu | 2.3 | 0.1 | Th | 105 | 8 | |
| Ga | 22 | 2 | U | 2.40 | 0.19 | |
| La | 180 | 12 | V | 52 | 4 | |
| Mn | 320 | 20 | Y | 28 | 2 | |
| Nb | 27 | 2 | Yb | 1.6 | 0.2 | |
| Nd | 200 | 12 | Zn | 120 | 10 | |
| Ni | 17 | 2 | Zr | 550 | 30 |
| Element | µg/g | ± | Element | µg/g | ± | |
|---|---|---|---|---|---|---|
| Be | 1.5 | 0.2 | Ho | 1.0 | 0.1 | |
| Cs | 1.2 | 0.1 | Li | 36 | 1 | |
| Dy | 6.1 | Lu | 0.23 | 0.03 | ||
| Er | 2.2 | Mo | 2.1 | 0.6 | ||
| F | 3000 | Pr | 51 | 5 | ||
| Gd | 12 | 2 | Ti | 1.1 | ||
| Hf | 14 | 1 | Tm | 0.29 | 0.02 |
Denver, Colorado
November 1998
Dr. Linda Gunderson
Central Region Mineral Resources Team
Wilson, S.A., 1998, Data compilation for USGS reference material GSP-2, Granodiorite, Silver Plume, Colorado, U.S. Geological Survey Open-File Report (in progress).
| Symbol | Definition |
|---|---|
| Wt% | Weight percent of element/oxide as received |
| µg/g | Micrograms of element per gram of sample, as received |
| ± | One standard deviation |
USGS reference materials (RMs) may be obtained directly from Dr. Stephen A. Wilson. The price for each bottle of RM is $80.00 (U.S. dollars) except DGPM-1, which is $175.00 (U.S. dollars). For domestic orders, this cost includes all shipping and handling charges using normal mail delivery. For foreign orders, delivery charges will be added to the final bill. Urgent requests for RMs should be initiated by Fax or e-mail. If required, overnight delivery is available with these charges added to the final bill.
Dr. Stephen A. Wilson
U.S. Geological Survey
Box 25046, MS 964
Denver, CO 80225
Tel: 303-236-2454
FAX: 303-236-3200 or 303-236-1425
e-mail: (wilson)
Domestic customers: Payment options include purchase order, check, money order, or credit card (Visa, Mastercard).
International customers: Payment on foreign orders can only be made using the following:
Payments for domestic or international orders using a credit card receive a 10% discount on the per bottle price.
Beginning in 2006, users of USGS geochemical reference standards must complete a user agreement form prior to the order being purchased.
User agreement for domestic users: Word format, 56 KB and PDF format, 24 KB.
User agreement for foreign users: Word format, 56 KB and PDF format, 28 KB.
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Page Last Modified: 04-Dec-2008@13:47
