U.S. Geological Survey Certificate of Analysis
Material was collected in 1976 from the Bull Run quarry near Centreville, Virginia. This is the same collection site as USGS reference mateirals W-1 (Fairbairn, 1950). The diabase consists of augite and plagioclase with smaller amounts of quartz, potassium feldspar, biotite and opaque minerals.
Values listed are derived using at least two independent techniques from at least two independent laboratories. Statistical treatment of the data uses the procedures outlined in previous USGS publications (Flanagan and Gottfried, 1980). Supplemental information is derived from international data compilations (Gladney and Roelandts, 1988, Govindaraju, 1994,).
Values are presented when only a single method of analysis was used or results from independent laboratories are not in statistical agreement.
|Oxide||Wt %||±||Oxide||Wt %||±|
revised March 1995
David B. Smith
Central Region Mineral Resources Team (formerly Branch of Geochemistry)
Flanagan, F.J., and Gottfried, D., 1980, USGS rock standards III; Manganese-nodule reference samples USGS NOD-A-1 and USGS-NOD-P-1: U.S. Geological Survey Professional Paper 1155, 39 p.
Flanagan, F.J., 1984, Three USGS Mafic Rock Reference Samples, W-2, DNC-1, and BIR-1: U.S. Geological Survey Bulletin 1623, p. 54.
Gladney, E.S., and Roelandts, I., 1988, 1987 Compilation of Elemental Concentration Data for USGS BIR-1, DNC-1, and W-2: Geostandards Newsletter, 12:63-118.
Govindaraju, K., 1994, 1994 Compilation of Working Values and Descriptions for 383 Geostandards: Geostandards Newsletter, 18:1-158.
|Fe2O3T||Total iron expressed as Fe2O3|
|Ctot||Total carbon concentration|
|Stot||Total sulfur concentration|
|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.
Order and Pricing Information
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Dr. Stephen A. Wilson
U.S. Geological Survey
Box 25046, MS 964D
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